sum_series() 求一列数的指定个数的数和(5个数字的和)

 1 #include <stdio.h>

 2 #include <stdarg.h>

 3 /*用sum_series() 求一列数的指定个数的数和(5个数字的和)*/

 4 double sum_series(int num, ...);

 5 

 6 int main()

 7 {

 8     double s;

 9     s = sum_series(5, 0.5, 0.25, 0.125, 0.06254, 2.0);

10     printf("Sum of series is %2.8f.\n", s);

11     return 0;

12 }

13 

14 double sum_series(int num, ...)

15 {

16     double sum= 0.0, t;

17     va_list a;

18     va_start(a, num);

19     for(; num; num--)

20     {

21         t= va_arg(a, double);

22         sum= sum+ t;

23     }

24     va_end(a);

25     return sum;

26 }