p16

Write a C program that will take any number of integers from the command line as argument and print the sum of all those integers.

1. /* 

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

3.  * Recursively

4.  */

5. #include <stdio.h>

7. int count, s = 0;

8. void sum(int *, int *);

10. void main(int argc, char *argv[])

11. {

12.     int i, ar[argc];

13.     count = argc;

14.     for (i = 1; i < argc; i++)

15.     {

16.         ar[i - 1] = atoi(argv[i]);

17.     }

18.     sum(ar, ar + 1);

19.     printf("%d", s);

20. }

22. /* computes sum of two numbers recursively */

23. void sum(int  *a, int  * b)

24. {

25.     if (count == 1)

26.         return;

27.     s = s + *a + *b;

28.     count -= 2;

29.     sum(a + 2, b + 2);

30. }

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