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Hi, everyone.

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So in this video, we are going to solve this question, convert a string to integer, so I have a string,

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one, two, three, four, five.

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So this is string and I want to convert this string into indigenous or integer will be one, two, three,

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four and five.

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So twelve thousand three hundred and forty five.

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OK, so given a string I want to convert it into an integer.

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So how are we going to solve this question so we can easily solve this question with the help of all

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over by loop.

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But we will use recursion to solve this question.

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So let's see how it and will help us to solve this question.

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So it's very simple.

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You have this one, two, three, four and five.

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So this is basically your string.

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So what will do?

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I will break our problem like this, so you have this this is you ready you will call the guys in on

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this area.

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So if you will call, let it go.

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This area.

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So so the output will be an integer.

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So this area will be converted into an integer.

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So after this area.

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So the string one, two, three, four.

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So string one, two, three, four converted into an integer.

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So this will be one, two, three and four.

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So this is the answer returned by that equation.

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So the equation will convert this string in 20 years.

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So I will get the integer and let's call it, Smolan said.

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So what I will do last digit is basically five, so I will convert character five in twenty five, I

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will simply write like this character five minus character zero.

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So the output will be integer five because we know character minus character is integer.

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So I will go to five.

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So I know the small answer, which is one, two, three, four.

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I know the last digit.

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So this is the last digit.

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Now, what I need to do, so I will multiply Smolan Surbiton and I will add last digit, so a small

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answer is one, two, three, four, one, two, three, four, multiplied by ten plus last digit.

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So this will be one, two, three, four and five, which is the right answer.

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OK, which is detailed answer.

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So approach is very simple.

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You will call that it in on this area.

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So this idea is basically.

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So this is, let's say, string and a number of elements and minus one.

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So this will give us.

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So the question will convert this area because it will convert this part of the string to an integer,

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so I will get, Smolan said.

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I will get someone to answer, I will multiply small answer by 10 and I will add last digit.

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So last digit is currently a character and I need to find out the integer.

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So I will, but I will also.

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The last resort is basically string and minus one.

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So this is this Nix's and minus one.

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So string and minus one will give me the character.

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I will minus, I will subtract zero and I will get the last digit.

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So approach is very simple.

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One, two, three, four and five.

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What we will do so first of all, you will call the on this area, so it will be converted to one,

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two, three, four.

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So basically string one, two, three, four is converted into this.

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This is smaller and smaller.

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So multiply by 10 plus last digit will be one, two, three, four and five.

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And this will be our final answer and we will have done this simple.

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So in order to pass this small area, in order to pass this area, what are you to do?

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You need to take you will pass and minus a number of elements and minus one.

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So N means basically the land.

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So we need a land function.

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So we have already written the code for the land function.

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So let's create a string.

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So my string is basically, let's say one, two, three, four, five.

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One, two, three, four, five.

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This is my string.

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I want to convert it into an integer.

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So let's write the function.

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The name of the function will be.

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Convert string and there will be integer, so convert string.

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To India, what it will take, so it will take the character very.

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It will take the number of elements and and what is known and is basically the Lent, so it is will

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call the land function number of elements.

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And I will give string area, I will give my strength, so the base case is very simple.

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If a number of elements are zero, if the size is zero but Reverand deteriorate, there will be zero.

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So if thing is empty.

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I will return zero if this thing is complete, then if we convert the Palestinians, you will get zero.

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Otherwise what are you to do?

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So you need to call dedication.

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This approach is very simple.

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This is one, two, three, four and five, what I will do, I will call variegation on one, two,

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three and four.

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So called verification on this small string, so basically a number of elements and minus one, and

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it will give the integer one, two, three and four.

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So this is our small answer.

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So it is a very small answer, so integer.

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Smart answer is basically, I will call the function convert string to integer.

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String theory and number of elements and minus one.

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So after getting this more answer, after getting one, two, three, four, I need to find out the

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last digit.

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So currently the last -- is a character, so string and minus one, the index is in minus one.

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So this is basically a character I want integer.

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So I will subtract the zero and I will get the integer.

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So let's try to find out the last digit.

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So what is last digit.

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So this is.

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The last element is a character minus zero, character zero, so you will get the Integer and Virgilia

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final answer.

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So your final answer will be you will multiply this small answer.

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So one, two, three, four will be multiplied by 10 so that it will become one, two, three, four

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zero.

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And then you will add the last digit.

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Last digit is five.

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OK, so multiply by 10 and then add the last digit and this will be your final answer.

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So what is our final answer?

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So our final answer is basically our small answer, we will multiply a small answer by 10, we will

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add last digit and that is our final answer.

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So we will return our final answer.

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So I think our function will work.

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So let's start functioning.

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So let's call the function convert to string.

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Let's give it string.

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And this function well.

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Diana DeGette, 23, is basically convert toasting and now we will print a so is an integer.

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So A's integer.

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One, two, three, four, five.

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Simple.

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So let's check.

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OK, so this is not working, so I need to pass two things, I have to pass a number of elements also.

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So a number of elements is in.

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And this is our A.J., one, two, three, four, five.

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So basically.

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So this is our integer one, two, three, four and five.

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Simple, so that's how it is working, so let's write in this code so that you guys can understand.

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So let's write in our code for this example.

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Only one, two, three, four and five.

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So I have one, two, three, four, five.

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So I will call you guys in on one, two, three, four.

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Then I will call that equation one, two, three, then I will call Erica Jong un went to.

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Then I call that equation on one.

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So a number of elements went ahead and then I recall that equation ampitheater.

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So basically a number of elements.

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Zero seven zero zero.

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So I will return zero to a small answer is basically zero.

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You will find out the last digit last digit is one.

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So zero multiplied by ten plus one.

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So I will return one.

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So Lastminute is basically two Los Angeles two, so one multiplier 10 plus two, so I will return to

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El Lastminute this basically so 20 multiplied 10 plus three, so I will return 123.

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So last digit is basically four.

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So small answer is 123.

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Smolan is 123 so small and multiply digit so multiply 10.

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LaserJet is four.

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So I will return one, two, three, four.

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So small answer is one, two, three, four, lastminute is five, so multiply by ten and plus five.

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So you've done one, two, three, four and five and that is the correct answer.

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So that's how our function is working.

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So right now, our function will not work for cases like minus 123.

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So this is a valid integer, right?

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So if there's a string, if this thing is minus 123, then your output should be minus 123.

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But our code will not handle this.

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Similarly, if nothing is plus 123, so the digital part will be 123.

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So currently our code will not handle this.

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Similarly, if the input string is wrong, for example, the inputs doing this, one, two, maybe three,

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four.

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So if this is the string, then you cannot convert the string into the integer.

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OK, so this string cannot be converted into an integer and our function will not handle this case also.

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So our function has a lot of limitation.

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It will work only for specific inputs.

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OK, so for example, string C, you are putting string so string can be very, very long.

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So if this is our string, one, two, three, four, five, six, seven, eight, nine, one, two,

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three, four, five, six, seven, eight, nine and so on.

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So string can contain as many number of characters as you'd want.

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So string can be very, very large.

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So can you convert this string into an integer?

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No.

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So Integer has basically a very small range.

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OK, you are returning integer so you cannot convert this big number into an integer.

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OK, so this type of string, a very long string, cannot be converted into an integer.

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So I think an integer you can store around nine digits, we can store around nine digits and not more

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than nine digits.

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If you want to store it in digits, you need to use that the type longlong, but our string can contain

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as many number of characters as it wants.

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So if this thing is containing 20 letters containing 20 characters or let's say two hundred characters,

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then this cannot be converted into an integer so that a function will not work for those cases also.

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So our function will work only for small inputs and for right inputs.

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OK, so this is from this video.

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I will tell you the next one.