I encountered a problem when running C program. How to solve that problem. I use Dev-C++ 5.11

Code here:

#include <stdio.h>

int stringCount(int n){
int count = 0;
while(n >= 10){
n /= 10;
count++;
}
return count;
}

int stringEnd(int n)
{
return n % 10;
}

int main()
{
/* @function...