4.1.1程序解析一求π的近似值 #include<stdio.h> #include <math.h> π 11 void main() =1-二+ -一十· 4 3 57 int denominator,flag; double item,pi; flag =1;denominator=1 item =1.0;pi =0; while(fabs (item)>=0.0001) item flag 1.0 denominator; pi=pi+item; flag -flag; denominator denominator +2; 不确定循 } pi=pi*4; 环次数 printf(“pi=%fn”,pi); for(i=1;i<=100;i++)4.1.1 程序解析－求π的近似值 #include<stdio.h> #include <math.h> void main( ) { int denominator, flag; double item, pi; flag = 1; denominator = 1 ; item = 1.0; pi = 0; while (fabs (item) >= 0.0001) { item = flag * 1.0 / denominator; pi = pi + item; flag = -flag; denominator = denominator +2; } pi = pi * 4; printf ( “pi = %f\n”, pi); } 1 1 1 1 4 3 5 7  = − + − + 不确定循 环次数 for( i=1; i<=100; i++ )