Programming Example
Find the sum of the digits of a number by command line Arguments
Find the sum of the digits of a number by command line Arguments
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char * argv[])
{
long num, temp, digit, sum = 0;
if(argc == 1 || argc > 2)
{
printf("Enter the number\n");
exit(1);
}
num = atoi (argv[1]) ;
temp = num;
while (num > 0)
{
digit = num % 10;
sum = sum + digit;
num /= 10;
}
printf("Sum of the digits of %ld = %ld\n", temp, sum);
}123
Sum of the digits of 123 = 6
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.