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






  1. C++ Tutorial
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  3. float
#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