exp_out.c

C语言常用的程序900例

#include <stdio.h>

void main ()
 {
   float pi = 3.14159;
   float radius = 2.0031;

   printf("The circle's area is %e\n", 2 * pi * radius);
   printf("The circle's area is %E\n", 2 * pi * radius);
 }