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Count number of digits in c

There are more than one solution for finding the-number-of-digits in a given number.


For example:



Method-1:


int findn(int num)
{
    char snum[100];
    sprintf(snum, "%d", num);
    return strlen(snum);
}


Method-2:
 
 
int findn(int num)
{
    int n = 0;
    while(num) {
        num /= 10;
        n++;
    }
    return n;
}


Method-3:
 
 
int findn(int num)
{
    /* math.h included */
    return (int) log10(num) + 1;
}

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