为啥 “for”那行有4个报错?
# include <stdio.h>
# include <math.h>
int main(){
float i,max;
float pi = 0.0;
printf("Please enter a float number for simulate upper range 'max':");
scanf("%f",&max);
for(i=0;(2i+1)<=max;i++) pi += 4*pow(-1,i)/(2i+1);
printf("pi=%lf\n",pi);
return 0;
}