C++ programming function

Introduction
 Use of function
 Calling a formula defined by user
 Input & Output depends on type of function

 Not included in main body

 Can be called many times

Function Prototype
 After #include<iostream>
 Before int main()

Example 1

# include <iostream>

void FindMax(int, int); //prototype

using namespace std;
int main()

4

Calling Function
Example 2

int main()
{
int num1, num2;
cout<<"Please enter a number :";
cin>> num1;
cout<<"Great!nPlease enter a second number :";
cin>> num2;
FindMax(num1, num2); //calling function

system ("PAUSE");
return 0;
}

Defining Function
 Outside main body
Example 3

void FindMax(int x, int y){
int maxNum;
if (x>=y)
maxNum=x;
else
maxNum=y;
cout<<"Maximum number is : "<<maxNum <<endl;
}

Using reference variable
 The Prototype:
 void FindMax(double, double, double&);

 The Calling:
 FindMax(num1, num2, maxNum);

 The Defining:
 void FindMax(double x, double y, double& maxNum)

 maxNum: a value edited in main function

• Compare Example 2

Example 4

int main()
{
double num1, num2, maxNum;
cout<<"Please enter a number :";
cin>> num1;
cout<<"Great!nPlease enter a second number :";
cin>> num2;
FindMax(num1, num2, maxNum); //calling

system ("PAUSE");
return 0;
}

Go to DevC++

Looping Function
 Just insert function in loop to call as needed
 Looping with returned value :
 Declare return value
 Send value to function

 Write a loop
 Example :
 Using while loop to keep comparing numbers

Example 5

char next;
while(true){
cout<<"n('n' to exit')Compare with next number? :";
cin>> next;
if(next=='n')
break;
cout<<"Okay!nPlease enter the next number :";
cin>> num1;
num2 = maxNum;
FindMax(num1, num2, maxNum);
}

C++ programming function

More Related Content

What's hot

Viewers also liked

Similar to C++ programming function

Recently uploaded

C++ programming function