Get number of digits of a number

Question

I have a number like this: int num = 36729; and I want to get the number of digits that compose the number (in this case 5 digits).

How can I do this?

Answer 1

Inefficient, but strangely elegant...

#include 
#include 

int main(void)
{
    // code to get value
    char str[50];
    sprintf(str, "%d", value);

    printf("The %d has %d digits.\n", value, strlen(str));

    return 0;
}