3.5) Formatting Of Floating-Point Values

Examples

double x = 0.012574;
cout << x << endl;                      // outputs "0.012574"
cout << setprecision(4) << x << endl;   // outputs "0.01257"
cout << fixed << x << endl;             // outputs "0.0126"
cout << scientific << x << endl;        // outputs "1.2574e-02"

Explanation

• fixed specifies that 'fixed' (non-scientific) notation should be used for all subsequent output of floating-point values
• scientific specifies scientific notation for subsequent output of floating-point values, such that 0.01 outputs as 1.000000e-2, etc
• setprecision sets precision for output of floating-point values
• By default, precision is maximum number of significant figures to use
• If fixed mode has been enabled, precision is the number of decimal places
• If scientific mode has been enabled, precision is the number of decimal places used for the significand