c语言编写自定义函数sabc(),其功能是:用循环结构计算1 1/5 1/9 1/13 … 1/n

#include "stdio.h"

double sabc(int n){

double s;

int i;

for(s=0.0,i=1;i<=n;s+=1.0/i,i+=4);

return s;

}

int main(int argc,char *argv[]){

printf("1+1/5+1/9+...+1/21 ≈ %g\n",sabc(22))