I want C program that receives numbers until the user input (-1), then print reverse all of numbers

[Alireza Saidi]

#include <stdio.h> // int reverse(int n) {    int rev_num = 0;        while (n != -1)    {              return n;      }    if (n == -1)        {            rev_num = rev_num * 10 + n % 10;        n = n / 10;            return reverse(rev_num);        }     } int main() {    int n,result;        puts("Enter numbers: ");    scanf("%d",&n);    result = reverse(n);    printf("result is : %d",result);    return 0; }

[Al Hobbs]

Do you have a question or what

[Campbell Ritchie]

Welcome to the Ranch

I think you have misunderstood the quesstion. You are supposed to enter numbers and stop when −1 is entered. You want a loop for the input with ... while (input != -1) ... in. You need a separate function for reversing the digits in the number.
Warning: 567890 will reverse to 98765, and if you reverse that again you will get 56789, not the original number.

[Alireza Saidi]

Al Hobbs wrote:Do you have a question or what

Hell0! I need help to solve it please.

[Alireza Saidi]

Hello dear friend! How can I solve that? Can you help me please?

[Campbell Ritchie]

Please don't quote the whole of a preceding post; that adds nothing new and is liable to removal without notice.
Start by writing a program that takes entry of a number and simply prints, “You entered 123456.” When that is working correctly, you can enhance it by adding more functionality.

[John Matthews]

Hi Alireza - please can you copy/paste the actual question just so we know exactly what it is you are trying to do?

[fred rosenberger]

Alireza Saidi wrote:Hello dear friend! How can I solve that? Can you help me please?

People here love to help you, but they won't do it for you.  You need to tell us what exactly the problem is.  Does this compile? does it run?  does it give the wrong output?

tell us the details.  Ask questions.  engage with people who post, and you will get more help than you could ever ask for.

[John Regard]

first, take out the while loop from the recursive function and put it on the main function instead.
then, your prorgam function should look something like
// iterative version int rev_num = 0; while(n){ rev_num = rev_num * 10 + n % 10; n /= 10; } // recursive version int reverse(int n, int rev_num=0){ if (n == 0) return rev_num; return reverse(n / 10, rev_num * 10 + n % 10); }

[Campbell Ritchie]

Welcome to the Ranch