#include <cmath>
#include <cstdio>
double dj(double Min,double Max,double flags=0.00001)//最大值,最小值,精度
{
double i,j=0;
if(Min>Max)return 0;
for(i=Min;i<Max;i+=flags)
{
j+=sin(flags); //这里求的是sin的
}
return j;
}
int main()
{
printf("%.6lf",dj(0,3.1415926));
}原文:http://blog.csdn.net/qq754406613/article/details/43639201