C program to Swap the value of two Variables | Using a 3rd Variable & without Using a 3rd Variable

Problem Statement

Write a C program to Swap the value of two Variables. (Using a 3rd Variable & without Using a 3rd Variable)

Source Code

//Using a 3rd Variable


#include <stdio.h>
#include <stdlib.h>

void main(){
	float var1,var2,var3;
	
	//Taking inputs
	printf("Enter Variable 1:\t");
	scanf("%f",&var1);
	printf("Enter Variable 2:\t");
	scanf("%f",&var2);
	
	//Printing Inputs
	printf("\n\nBefore Swap\n__________________\nVariable 1:\t%f\nVariable 2:\t%f",var1,var2);
	
	//Swap using 3rd variable
	var3=var1;
	var1=var2;
	var2=var3;
	
	//Printing Output
	printf("\n\nAfter Swap\n__________________\nVariable 1:\t%f\nVariable 2:\t%f",var1,var2);
}









//Not Using a 3rd Variable

#include <stdio.h>
#include <stdlib.h>


void main(){
	float var1,var2;
	
	//Taking inputs
	printf("Enter Variable 1:\t");
	scanf("%f",&var1);
	printf("Enter Variable 2:\t");
	scanf("%f",&var2);
	
	//Printing Inputs
	printf("\n\nBefore Swap\n__________________\nVariable 1:\t%f\nVariable 2:\t%f",var1,var2);
	
	//Swap using 3rd variable
	var1=var2+var1;
	var2=var1-var2;
	var1=var1-var2;
	
	//Printing Output
	printf("\n\nAfter Swap\n__________________\nVariable 1:\t%f\nVariable 2:\t%f",var1,var2);
}

Input

Enter Variable 1: 14
Enter Variable 2: 65

Output

Before Swap

---

Variable 1: 14.000000
Variable 2: 65.000000

After Swap

---

Variable 1: 65.000000
Variable 2: 14.000000