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

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

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.

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/* 
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 * C Program to Find Sum of Numbers given in Command Line Arguments

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 * Recursively
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 */
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#include <stdio.h>
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int count, s = 0;
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void sum(int *, int *);
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void main(int argc, char *argv[])
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{
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    int i, ar[argc];
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    count = argc;
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    for (i = 1; i < argc; i++)
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    {
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        ar[i - 1] = atoi(argv[i]);
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    }
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    sum(ar, ar + 1);
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    printf("%d", s);
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}
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/* computes sum of two numbers recursively */

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void sum(int  *a, int  * b)
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{
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    if (count == 1)
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        return;
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    s = s + *a + *b;
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    count -= 2;
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    sum(a + 2, b + 2);
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}
```

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

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