Structure and Union
In this example, We will learn a program to swap two numbers using pointers. Before that, You must have knowledge of the following topics.
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This is the algorithm of this program
Step 1: Start
Step 2: Declare integer variables a, b and temp
Step 3: Declare pointer variables ptra and ptrb
Step 4: Take input from user and store in a and b
Step 5: Assign address of a to ptra
Step 6: Assign address of b to ptrb
Step 7: temp = *ptra
Step 8: *ptra = *ptrb
Step 9: *ptrb = temp
Step 10: Print a and b
Step 11: End
This is the flowchart of this program
Now, We will see the code to swap two numbers.
int a, b;
int *ptra, *ptrb;
printf("Enter value for a: ");
printf("\nEnter value for b: ");
printf("\nThe values before swapping are: a = %d b = %d", a, b);
ptra = &a;
ptrb = &b;
temp = *ptra;
*ptra = *ptrb;
*ptrb = temp;
printf("\nThe values after swapping are: a = %d b = %d", a, b);
The output of above program is
Enter value for a: 10
Enter value for b: 20
The values before swapping are: a = 10 b = 20
The values after swapping are: a = 20 b = 10
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