#include <stdio.h>
#include <stdlib.h>



int main(void) {
/*
    float digit, temp1, temp2, temp3;
    int dig1st, dig2nd, dig3rd, digSum;

    printf("Enter a tree digit number!\n");
    scanf("%f", &digit);

    temp1 = (digit / 100.0);
    printf("temp1: %.3f\n", temp1);

    dig1st = (int)temp1;
    printf("dig1st: %d\n",dig1st);


    temp2 = (temp1 - dig1st) * 10;
    printf("temp2: %.3f\n", temp2);

    dig2nd = (int)temp2;
    printf("dig2nd: %d\n",dig2nd);


    temp3 = (temp2 - dig2nd) * 10;
    printf("temp3: %.3f\n", temp3);

    dig3rd = (int)(temp3);
    printf("dig3rd: %d\n",dig3rd);

*/
    int num;
    int units, tens, hundreds;

    printf("Enter a 3-digit number: ");
    scanf("%d", &num);

    units = num % 10;
    tens  = (num / 10) % 10;
    hundreds = num / 100;

    printf("The total sum of digits in %d is %d\n", num, units+tens+hundreds);

    return 0;
}