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.
", 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 }