Integer - Sum of Digits

The program must accept an integer value N as a command line argument and print the sum of the digits in N.

Example Input/Output 1:
Input:
14

Output:
5

Example Input/Output 2:
Input:
1932

Output:
15

Source code:

#include<stdio.h>

int main(int v,char *n[]){

     v=atoi(n[1]);

    int sum=0;

    while(v!=0){

        sum+=v%10;

        v/=10;

    }

    printf("%d",sum);

}