Literals/Floating point: Difference between revisions

=={{header|C++}}==

<lang cpp>#include <iostream>

int main()

{

// a numeric literal with decimal point is a double

auto double1 = 2.5;

// an 'f' of 'F' suffix means the literal is a flaot

auto float1 = 2.5f;

// an 'l' or 'L' suffix means a long double

auto longdouble1 = 2.5l;

// a number after an 'e' or 'E' is the base 10 exponent

auto double2 = 2.5e-3;

auto float2 = 2.5e3f;

// a '0x' prefix means the literal is hexadecimal. the 'p' is base 2 the exponent

auto double3 = 0x1p4;

auto float3 = 0xbeefp-8f;

std::cout << "\ndouble1: " << double1;

std::cout << "\nfloat1: " << float1;

std::cout << "\nlongdouble1: " << longdouble1;

std::cout << "\ndouble2: " << double2;

std::cout << "\nfloat2: " << float2;

std::cout << "\ndouble3: " << double3;

std::cout << "\nfloat3: " << float3;

std::cout << "\n";

}</lang>

{{out}}

<pre>

double1: 2.5

float1: 2.5

longdouble1: 2.5

double2: 0.0025

float2: 2500

double3: 16

float3: 190.934

</pre>