How to extract digits from a number in C? Begining from the most significant digit?

Question

Getting digits from a number beginning from the least significant in C is pretty easy:

#include 

int main()
{
    int num = 1024;

    while(         


        

Answer 1

Assuming a 32 bit signed number that is positive, then as a simple example:

#include 

int main()
{
int rmdr;
int dvsr;
int quot;
    scanf("%d", &rmdr);               // read in number
    dvsr = 1000000000;
    while(0 >= (quot = rmdr / dvsr)){ // skip leading zeroes
        rmdr %= dvsr;
        dvsr /= 10;
        if(dvsr == 1)
            break;
    }
    while(dvsr){                      // display number
        quot = rmdr / dvsr;
        printf("%1d", quot);
        rmdr %= dvsr;
        dvsr /= 10;
    }
    printf("\n");
    return(0);
}

or a slight optimization:

int main()
{
int rmdr;
int rm10;
int dvsr;
int quot;
    scanf("%d", &rmdr);               // read in number
    rm10 = rmdr/10;
    dvsr = 1;
    while(dvsr <= rm10)               // skip to 1st digit
        dvsr *= 10;
    while(dvsr){                      // display number
        quot = rmdr / dvsr;
        printf("%1d", quot);
        rmdr %= dvsr;
        dvsr /= 10;
    }
    printf("\n");
    return(0);
}