How to determine how many digits an integer has in C language

Implementation code:

#include <stdio.h>
int main()
{
    long long a;
    int count=0;
 
    printf("请输入一个整数:");
    scanf("%lld",&a);
 
    while(a!=0)
    {
     
        a/=10;
        count++;
    }
 
    printf("输入的数字是%d位数。",count);
}

where long long is a long integer and lld is the input method of this type. In this program, count is a counter that records the bits of the input number. number.

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