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Swap Two Numbers

Certification: Basic Level Accuracy: 60.58% Submissions: 104 Points: 5

Write a C++ program that swaps two numbers using pointers.

Example 1
     
  • Input: a = 5, b = 10
    •  
  • Output: a = 10, b = 5
    •  
  • Explanation: 
       
    • Step 1: Declare pointers for variables a and b.
      •  
    • Step 2: Use pointers to access and swap the values.
      •  
    • Step 3: After swapping, a = 10 and b = 5.
      •  
    •
Example 2
     
  • Input: a = -3, b = 7
    •  
  • Output: a = 7, b = -3
    •  
  • Explanation: 
       
    • Step 1: Declare pointers for variables a and b.
      •  
    • Step 2: Use pointers to access and swap the values.
      •  
    • Step 3: After swapping, a = 7 and b = -3.
      •  
    •
Constraints
     
  • The values of a and b are integers
    •  
  • Use pointers to swap the values
    •  
  • Time Complexity: O(1)
    •  
  • Space Complexity: O(1)
    •
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Hint
Solution

Solution Hints

    
  
  • Use pointers to access the memory locations of the variables.
    • 
  
  • Swap the values stored at the memory locations using a temporary variable.
    • 
  
  • Ensure that the original variables are modified after the swap.
    •

Steps to solve by this approach:

 Step 1: Define a function swap_numbers that takes two integer pointers as parameters.

 Step 2: Use a temporary variable to store the value at the first pointer's address.

 Step 3: Assign the value at the second pointer's address to the first pointer's address.

 Step 4: Assign the temporary value to the second pointer's address.

 Step 5: In main, declare two integer variables and initialize them.

 Step 6: Call swap_numbers with the addresses of these variables.

 Step 7: Print the swapped values to verify the operation.

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