4.4.2: Literals and Constants - Floating Point

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Floating-Point Literals

These are used to represent and store real numbers. The real number has an integer part, real part, fractional part and an exponential part. The floating-point literals can be stored either in decimal form or exponential form. While representing the floating-point decimals one must keep two things in mind to produce valid literals:

In the decimal form, one must include the decimal point, exponent part or both, otherwise, it will lead to an error.
In the exponential form, one must include the integer part, fractional part or both, otherwise, it will lead to an error.

Few floating-point literal representations are shown below:

Valid Floating Literals:

10.125
1.215-10L
10.5E-3

Invalid Floating Literals:

123E
1250f
0.e879

Example:

#include <iostream> 
using namespace std; 

int main() 
{   // Real literal 
    const float floatVal = 4.14; 

    cout << "Floating-point literal: " << floatVal << "\n"; 
    return 0; 
}

Output:

Floating point literal: 4.14

Adapted from:
"Types of Literals in C/C++ with Examples" by Chinmoy Lenka, Geeks for Geeks