#include<stdio.h> #define PI 3.142 int main() { int r; float area; for (r = 1; r <= 10; r++) { area = PI * r * r;/*计算圆的面积*/ if (area > 100)/*判断圆的面积是否大于100*/ break;/*提前结束循环*/ printf("r=%d,area=%.2f ", r, area); } return 0; }