Thread: A C program to count the number of "sevens" in any given number.

Here is what I have done so far:

Code:

#include<stdio.h>
#include<math.h>

int main()
{
    int x,n,i,f;
    printf("Please enter an integer: \n");
    scanf("%d",&x);
    n=10;
    f=x;
    i=0;
    while((f/n)>0)
    {
        if((f%10)==7)
        {
            i+=1;
        }
        f=f/10;
    }
    printf("The number %d has %d sevens.",x,i);

}

The only problem with this code is that it does not count the first "seven" in the integer, for example:
If I input "77777", it will say that it has 4 sevens. I know here the problem is, I just don't know how to overcome it. Any ideas?

So start with just inputting 7, then step through the code to see what happens.