float point constant number : float « Data Types « C++ Tutorial

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C++ Tutorial » Data Types » float

2.9.1.float point constant number

#include <iostream.h>



const float PI = 3.1415926;



inline float Area(const float r);

main()

{

   float radius = 2.9;

   cout << "The Area is " << Area(radius) << "\n";

}

float Area(const float r){

    return PI * r * r;

}

The Area is 26.4208

2.9.float
	2.9.1.	float point constant number
	2.9.2.	float number array
	2.9.3.	Read float point numbers from keyboard and save them to a float array
	2.9.4.	Type Conversion: from float to double
	2.9.5.	constant floats, floating point variables
	2.9.6.	Local Float Variables and Parameters: convert the temperature in Fahrenheit to Celsius
	2.9.7.	Display decimal and float with format
	2.9.8.	Define function whose parameter and return value are both float
	2.9.9.	Tests whether two floating-point numbers are approximately equal.
	2.9.10.	Controlling the printing of trailing zeros and decimal points for floating-point values.
	2.9.11.	cin handles double and float type values

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