Define float constant value using Macro : float Declaration « Data Type « C Tutorial

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C Tutorial » Data Type » float Declaration

2.18.5.Define float constant value using Macro

#include <stdio.h>

#define PI   3.14159f               



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;

}

Input the diameter of a table:123
     
     The circumference is 386.42
     The area is 11882.28

2.18.float Declaration
	2.18.1.	Floating Point variables
	2.18.2.	The form of a floating-point declaration
	2.18.3.	Define float variable and output to the console
	2.18.4.	Define float in In scientific notation (The E notation)
	2.18.5.	Define float constant value using Macro
	2.18.6.	Assignment of an integer expression to a floating-point variable.

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