Page 285 - Computer_Science_F5

Computer Science Note: Parameters are values which need a function. Formal parameters are variables
to be passed into the function. They in the function heading.
create a link or communication
(ii) Function call
between the defined function and
If you want to use a defined function within
the main function. The following
FOR ONLINE READING ONLY
is the structure of the program to
function. During calling the function, you
represent function parameters. the main function, you have to call that
have to specify the name of the function,
funct1(x,y) return value and parameters if they are
{ included within the function. There
// function body are different ways of calling a function
…………… depending on whether the function returns
} a value or not.
main()
{ Returning value function
funct1(a,b); //function calling For the function which returns a value,
} the function will be treated as a value.
To call it, you have to define its data type
Where a, b are the actual parameters and x, and variable. An example of the calling
y are formal parameters. Actual parameters function with the integer data type is int
are variables or expressions listed in call to total = sum(10,20);

The following Program Example 4.27 demonstrates a C++ program that uses function
call to find maximum number of the two numbers. The output is shown in Figure 4.56.

Program Example 4.27:
Using function to find a maximum number

#include<iostream>
using namespace std;
int maximum(int x, int y)
{
int answer;
if (x>y)
answer=x;
else
answer = y;
return answer;
}
int main()
{
int a, b;
cout<<”Enter two number to find which is maximum”<<endl;
cin>>a>>b;
int t = maximum(a,b); //function call
cout<<”The maximum between “<<a<<” and “<<b<<” is “<<t;
return 0;
}

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Computer Science Form 5.indd 276 23/07/2024 12:34