Swapping Program in C

Introduction: Swapping Program in C

Swapping means exchanging the values between the two containers. In the programming world swapping program in C user variable instead of real-life containers.

Swapping programs accept two inputs and their values. The swapping program in C doesn’t require both the variables to be an integer. It could be float, char, string anything depending upon the user requirement

” swapping means replacing values of a variable with other variables. “

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Swapping logic with third variable in C Programming

To write a swapping program in C, a temporary variable used as the temporary storage. 

The first content of the variable “a” goes into a temp variable

Then the content of variable “b” in a variable

Then the content of the temp variable goes to b.

If you print the result the value is swap.

Declaring Variables in C Program

To start we will create a program that will be swapping two numbers. Here we will create 3 integers using the keyword int variables a, b, c.

Here, variable c is a temporary variable used as the temporary storage. 

main()
{

int a, b, c;

}

Take the user inputs for variable a and using scanf statement.

main()
{

int a, b, c;
scanf("%d",&a);
scanf("%d",&b);

}

To make it more friendly we will add a few statements using printf.

main()
{

int a, b, c;
printf("\n Swapping Program");
printf("\nEnter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);

}

Now your program will be more user-friendly to understand user.

Business Logic to Swapping numbers in C

Let’s implement the Business Logic to swapping logic in C language.

We will assign the value of a into c.

main()
{

int a, b, c;
printf("\n Swapping Program");
printf("\n Enter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);
c=a;

}

Then the value of b into a. 

main()
{

int a, b, c;
printf("\n Swapping Program");
printf("\n Enter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);
c=a;
a=b;

}

Then the value of c into b.

main()
{

int a, b, c;
printf("\n Swapping Program");
printf("\n Enter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);
c=a;
a=b;
b=c;

}

Let’s put a printf statement with respective placeholders and execute the programs.

main()
{

int a, b, c;
printf("\n Swapping Program");
printf("\n Enter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);
c=a;
a=b;
b=c;
printf("\n After Swapping ");
printf("\n a = %d",a);
printf("\n b = %d",b);

}

I am giving it an input of 10 and then 20. Now press enter. See the result values are swap.

Output : 

swapping output with third variable
Swapping Program
Enter value for a : 10

Enter value for b : 20

After Swapping
a = 20
b = 10

Swapping logic without third variable in C Programming

Writing swapping logic requires the basic knowledge of constants and variables in C Programming. If you don’t know constant and variables in C Programming please go back to book.

Declaring Variables in C Program

Two variables will be used to take the input from the user and swap the values

main()
{
int a , b;
}

Take the user inputs for variable a and using scanf statement.

main()
{

int a, b;
scanf("%d",&a);
scanf("%d",&b);

}

To make it more friendly we will add a few statements using printf.

main()
{

int a, b;
printf("\n Swapping Program");
printf("\nEnter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);

}

Now your program will be more user-friendly to understand the user.

Business Logic to Swapping numbers in C

Let’s implement the Business Logic to swapping logic in C language.

main()
{

int a, b;
printf("\n Swapping Program");
printf("\n Enter value for a : ");
scanf("%d",&a);
printf("\n Enter value for b : ");
scanf("%d",&b);
a = a+b;
b = a-b;
a= a-b;

printf("Value of A is %d and Value of B is %d",a,b);

}

Output : 

Swapping Program
Enter value for a : 5

Enter value for b : 10
Value of A is 10 and Value of B is 5
swapping output without third variable

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Frequently Asked question about Swapping numbers in C Programming

What is Swapping?

Swapping means replacing the content of containers. Containers may be anything like a box, utensils, bottle, etc.
In C Programming swapping means replacing values of a variable with other variables.
Generally, a variable can store an integer value or a float value or even a string.
But swapping without the third variable is used mostly in float and numbers.

What are the practical applications of Swapping in Programming?

Swapping is very small concept and a few lines of codes. But many things are almost impossible without the use of swapping.
Especially search algorithms and sort algorithms make use of swapping like bubble sort use swapping concept.
In modern programming, it’s used in very specific cases where we need to store the value of variable temporary without using persistent space.

Why we need to learn Swapping logic in C Programming?

Swapping is a very small programming language. You may think it’s not useful.
But ask a developer who has worked in core programming for 3-5 Years, he will tell you 100 Places where he would have use swapping logic.
In memory-intensive operation, swapping could be used to hold variable temporary and later swap them in the original variables.

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