如题所述
#include <stdio.h>
int main (void) {
float r,pi,area;
pi = 3.14159;
printf("请输入圆的半径r:");
scanf("%f",&r);
putchar ('\n');
area = pi*r*r;
printf ("半径为%.2f的圆,其面积为:%.2f\n",r,area);
getch ();
return 0;
}
int main (void) {
float r,pi,area;
pi = 3.14159;
printf("请输入圆的半径r:");
scanf("%f",&r);
putchar ('\n');
area = pi*r*r;
printf ("半径为%.2f的圆,其面积为:%.2f\n",r,area);
getch ();
return 0;
}
运行结果
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