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In order to reverse a number you should first input the number and then extract the digits of number one by one. In order to extract digit you can use % operator which results in remainder of division operation. 13%10 is 3. Thus by doing mod 10 you can get rightmost digit of number. After extracting digit you can remove the same from number by storing result of /10 in integer variable. Eg 13/10 is 1.3 but on storing it in integer variable only 1 is stored.

In order to reverse a number using while loop in c language you must run the loop till the number is not 0 that is all the digits haven't been extracted. Assuming that you want reverse of number in variable called y (initial value of y should be zero), you should write y=y*10+extracted digit in while loop.

Consider test input of a=123,y=0

iteration 1

y=0*10+3=3, a=12

iteration 2

y=3*10+2=32, a=1

iteration 3

y=32*10+1=321 a=0

thus we get reverse of number in y.

Below is the code of the Program

` int main()`

{

int a;

printf("Enter a number :");

scanf("%d",&a);

int y=0;

while(a)

{

y=y*10+a%10;

a=a/10;

}

printf("\nreverse= %d",y);

getch();

return 0;

}

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**cinterviews.blogspot.com@gmail.com**it will be useful for our job search community.www.cinterviews.com appreciates your contribution

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