Swap two numbers in cpp is simple program to swapping of two numbers in c++ using functions.
In this tutorial we will see What is swapping, how to swap two numbers and C++ program to swap two numbers using function.
What is swapping: Swapping of two numbers means replacing the numbers.
Their are two ways to swap two numbers using functions in c++
- Call by value
- Call by reference
Lets see methods
Call by value : When function are called by passing the value they are called as call by value.
First we will see program to swap two numbers using function by method 1 (call by value)
C++ Program To Swap Two Numbers Using Functions
| 123456789101112131415161718192021222324252627 | #include <iostream>using namespace std;void swap(int ,int );//Call By Valueint main(){ int a,b; cout<<“\nEnter Two Number To Swap :\n”; cin>>a>>b;cout<<“\n Before Numbers :\n\n”; cout<<“x= “<<a<<” “<<“y= “<<b<<” \n”; cout<<“\nAfter Swapping Numbers :\n\n”; swap(a,b); return 0;}void swap(int x,int y){ int z; z=x; x=y; y=z; cout<<“x= “<<x<<” “<<“y= “<<y<<” \n”;} |
Output :
Explanation :
1. First we declare the function which is swap function
=> void swap(int ,int );
2. Execution starts with the main method.
3. Declare the variables
a, b => to store two numbers
4. Take a input from user two numbers
=> cin>>a>>b; a = 10, b= 20
5. We print numbers before swapping.
6. Next we call function by passing value a and b .
swap(a,b); => function get executed
swap(int x,int y) { => x= 10 y = 20
z=x; => z=10
x=y; => x=20
y=z; => y = 10
7. Now we print numbers after swapping
cout<<“x= “<<x<<” “<<“y= “<<y<<” \n”;
} => Returns to main function
8. End with the program.
Call by reference: When function are called by passing the address they are called as call by reference.
we will see program to swap two numbers using function by method 2 (call by reference)
Write a program to swap two numbers using function in c++
| 12345678910111213141516171819202122232425262728 | #include <iostream>using namespace std;void swap(int *x ,int *y );//Call By refernceint main(){ int a,b; cout<<“\nEnter Two Number To Swap :\n”; cin>>a>>b;cout<<“\n Before Numbers :\n\n”; cout<<“x= “<<a<<” “<<“y= “<<b<<” \n”; cout<<“\nAfter Swapping Numbers :\n\n”; swap(&a,&b); cout<<“x= “<<a<<” “<<“y= “<<b<<” \n”; return 0;}void swap(int *x,int *y){ int z; z=*x; *x=*y; *y=z; } |
Output :
Explanation :
1. First we declare the function which is swap function
=> void swap(int *x ,int *y);
2. Execution starts with the main method.
3. Declare the variables
a, b => to store two numbers
4. Take a input from user two numbers
=> cin>>a>>b; a = 10, b= 20
5. We print numbers before swapping.
6. Next we call function by passing address of a and b
swap(&a,&b); => function get executed
swap(int *x,int *y) { => x= 10 y = 20
*z=*x; => *z=10
*x=*y; => *x=20
*y=*z; =>*y = 10
} => Returns to main function
7. Now we print numbers after swapping
cout<<“x= “<<x<<” “<<“y= “<<y<<” \n”;
8. End with the program.