Parameters written in a function definition are called the
Formal Parameters. If a function is designed to use arguments, it must declare variables
which accept values passed through function arguments. These variables are
called the formal parameters of the function. They are like local variables
inside the function. As mentioned in the following program; they are declared
after the function name inside parenthesis. Formal parameters are separated by comma in function
definition.
int sum(int num1, int num2)
{
int answer;
answer = num1 +
num2;
return answer;
}
The function sum( ) has two formal parameters: num1 and num2. This
function returns answer to the calling function. The formal parameters receive
the value of the arguments passed to the function. Remember that that, as local
variables, they are destroyed upon exit from the function.
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