Write+a+program++in+c+that+calculates+the+sum+of+the+digits+of+a+positive+integer+typed+in+from+the+keyboard.+For+example

Sure! Here's an example program in C that calculates the sum of the digits of a positive integer typed in from the keyboard:

#include <stdio.h>

int main() {
    int num, sum = 0, digit;
    printf("Enter a positive integer: ");
    scanf("%d", &num);
    while (num > 0) {
        digit = num % 10;
        sum += digit;
        num /= 10;
    }
    printf("The sum of the digits is %d\n", sum);
    return 0;
}

This program first prompts the user to enter a positive integer, then reads in the integer using `scanf()`. It then uses a `while` loop to repeatedly extract the rightmost digit of the integer using the modulus operator `%`, add it to a running sum, and remove that digit from the integer by dividing by 10. Once the entire integer has been processed, the program prints out the final sum.

I hope that helps! Let me know if you have any further questions.