Question

C语言：编写C语言代码求（2*3)/(x+3)+(2*5)/(x+5)+(2*7)/(x+7)+...前30项的值，x由键盘输入。咋写？

Answer 1

代码文本：

#include "stdio.h"

#define N 30

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

double s,x;

int t,n,i;

printf("Enter x(R:)...\nx=");

scanf("%lf",&x);

for(s=0.0,t=6,n=3,i=0;i<N;i++,s+=t/(x+n),t+=4,n+=2);

printf("The result are %f\n",s);

return 0;

}