Default Values for Function Parameters

Functions can be called with fewer actual parameters than formal parameters. The
unspecified parameters are given default values.
void fred(int one, float two = 1.23, char three = 'c')
{}
The arguments with default values must be the last parameters in the parameter list.
In this example, fred can then be called with 1, 2 or 3 parameters, e.g.
fred(6,7.2,'z');
fred(6,7.2);
fred(6);
When declaring functions that take parameters with default values, subsequent declarations
cannot specify the default values already specified in earlier declarations, but they can add
new default values. When declaring a function before use, specify the default values in the
first declaration, e.g.
void fred(int one, float two = 1.23, char three = 'c');
int main()
{
fred(6, 7.2);
}
void fred(int one, float two, char three)
{}