C Program to Find Sum of Numbers in Command Line Arguments Recursively

This is a C Program to find sum of numbers given in command line arguments recursively.

Problem Description

This C Program find sum of numbers given in command line arguments recursively.

Problem Solution

This C Program Prints the sum of numbers given in command line arguments.

Program/Source Code

Here is source code of the C Program to find sum of numbers given in command line arguments recursively. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/*
 * C Program to Find Sum of Numbers given in Command Line Arguments 
 * Recursively
 */
#include <stdio.h>
 
int count, s = 0;
void sum(int *, int *);
 
void main(int argc, char *argv[])
{
    int i, ar[argc];
    count = argc;
    for (i = 1; i < argc; i++)
    {
        ar[i - 1] = atoi(argv[i]);
    }
    sum(ar, ar + 1);
    printf("%d", s);
}
 
/* computes sum of two numbers recursively */
void sum(int  *a, int  * b)
{
    if (count == 1)
        return;
    s = s + *a + *b;
    count -= 2;
    sum(a + 2, b + 2);
}
Program Explanation

In this C Program, the sum() function is used to compute the sum of two numbers recursively. If condition statement is used to check the value of ‘count’ variable is equal to 1.

advertisement

If the condition is true, then we can’t compute the summation of two numbers hence return the value. Otherwise, if the condition is false, then compute the summation of the value of ‘s’ variable with the pointer variables ‘a’ and ‘b’, and decrement the value of ‘count’ variable by 2.

Runtime Test Cases
 
$ cc arg4.c
$ a.out 1 2 3 4
sum is 10

Sanfoundry Global Education & Learning Series – 1000 C Programs.

Free 30-Day C++ Certification Bootcamp is Live. Join Now!

Here’s the list of Best Books in C Programming, Data-Structures and Algorithms

If you wish to look at programming examples on all topics, go to C Programming Examples.

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
I’m Manish - Founder and CTO at Sanfoundry. I’ve been working in tech for over 25 years, with deep focus on Linux kernel, SAN technologies, Advanced C, Full Stack and Scalable website designs.

You can connect with me on LinkedIn, watch my Youtube Masterclasses, or join my Telegram tech discussions.

If you’re in your 40s–60s and exploring new directions in your career, I also offer mentoring. Learn more here.