program2_09.c

[C语言入门经典(第4版)]整本书的源码！值得推荐！全部是最简单的源码！

/* Program 2.9 More round tables */
#include <stdio.h>
#define PI   3.14159f                  /* Definition of the symbol PI */

int main(void)
{
  float radius = 0.0f;
  float diameter = 0.0f;
  float circumference = 0.0f;
  float area = 0.0f;

  printf("Input the diameter of a table:");
  scanf("%f", &diameter);
  radius = diameter/2.0f;
  circumference = 2.0f*PI*radius;
  area = PI*radius*radius;
  printf("\nThe circumference is %.2f", circumference);
  printf("\nThe area is %.2f", area);
  return 0;
}