C Language Basic to Advance Course > C Programming Exercises

Swap 2 Numbers

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  • STEP 1: START.
  • STEP 2: ENTER x, y.
  • STEP 3: PRINT x, y.
  • STEP 4: x = x + y.
  • STEP 5: y= x - y.
  • STEP 6: x =x - y.
  • STEP 7: PRINT x, y.
  • STEP 8: END.

To swap two variables, use the bitwise XOR operator. When two integers x and y are XORed, the result is a number with all bits set to 1 wherever the bits of x and y differ. For instance, the XOR of 10 (in Binary 1010) and 5 (in Binary 0101) is 1111, while the XOR of 7 (0111) and 5 (0101) is 1111. (0010).

This is a question that most of us have asked at some point in our lives. However, it is not easy to answer because there are so many possibilities. C language uses the two-operand instruction for swapping the two numbers in the expression on the left and right side of the equals sign. This is called a swap instruction. When C language executes an assignment statement, it first stores an old value in memory and then assigns a new value to the old memory location. This process is called de-referencing.

If you have a=1 and b=2, you are swapping. If you do a=2 and b=1 in any way, this number will be swapped. You can swap numbers with or without the use of variables!

Swapping two numbers in C can have consequences on the functionality of the program. For example, if you swap two numbers, it can cause an overflow error or undefined behavior.

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  1. Introduction to C Programming
    24m 32s
  2. How to use LearnVern
    3m 20s
  3. Assignment : Introduction to C
    3m 17s

  1. Setting up C Environment
    17m 24s
  2. First Program in C
    25m 16s
  3. Assignment : Setting up C & First Program on C
    3m 50s

  1. Basic Syntax
    21m 44s
  2. Data Types in C Programming
    26m 19s
  3. Assignment : Structure of C
    7m 38s
  4. Variables in C Programming
    20m 35s
  5. Storage Classes in C Programming
    28m 23s
  6. printf() and scanf() Functions
    22m 56s
  7. Constants in C Programming
    18m 8s

  1. Operators in C Programming
    23m 18s
  2. Assignment : Operators in C
    3m 20s

  1. Decision Making- If Statement, If-else Statement
    19m 5s
  2. Decision Making - Nested If, Switch Statement, Nested Switch Statement
    26m 7s
  3. Entry Contolled Loops - For Loop, While Loop
    29m 25s
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    21m 9s
  5. Break, Continue and Goto Statement
    14m 54s
  6. Assignment : Decision making and Flow Control
    9m 4s

  1. Introduction to User Defined Functions
    9m 28s
  2. User Defined Functions -Function Definition, Function Declaration and Function Call
    20m 55s
  3. User Defined Functions - Functions and Parameters
    19m 39s
  4. User Defined Functions- Types of Parameters
    20m 18s
  5. Scope of a Variable
    8m 3s
  6. Assignment : Working with User Defined Functions 1
    5m 24s
  7. Assignment : Working with User Defined Functions 2
    14m 45s

  1. Declaration & Initialization of Arrays
    17m 30s
  2. Accessing Array Elements
    12m 33s
  3. Types of Arrays
    7m 27s
  4. 2D Arrays
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  5. Multidimensional Arrays
    25m 9s
  6. Introduction to Pointers
    16m 36s
  7. Pointers with Functions
    34m 18s
  8. Pointer Types: Null Pointer, Wide Pointer, Void Pointer
    24m 3s
  9. Pointer Arithmetic
    23m 28s
  10. Array of Pointers
    9m 58s
  11. Working with Strings
    17m 10s
  12. Introduction to Structures
    9m 47s
  13. Basic Structure Example
    10m 32s
  14. Nested Structures, Array of Structures
    27m 24s
  15. Union in C Programming
    12m 27s

  1. Typedef Function in C Programming
    10m 7s
  2. Assignment : Typedef Function
    2m 57s

  1. Overview of File Handling
    15m 2s
  2. Reading and Writing to Files
    16m 45s
  3. Assignment : File Handling in C
    7m 14s
  4. Basic File Handling
    13m 2s
  5. Bit Fields
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  6. File Input/Output Functions -I
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  7. File Input/Output Functions -II
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  1. Preprocessors and Header Files
    8m 29s
  2. Assignment : Preprocessors and Header Files
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  1. Type Casting
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  2. Assignment : Type Casting
    2m 37s

  1. Error Solving in C
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  2. Assignment : Error Solving in C
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  1. Recursive Functions in C
    14m 53s
  2. Assignment : Recursive Functions
    3m 5s

  1. Variable Arguments in User Defined Functioncs
    20m 2s
  2. Assignment : Variable Arguments in User Defined Functions
    3m 14s

  1. Memory Management
    11m 34s
  2. Assignment : Memory Management
    2m 58s

  1. Command Line Arguments
    9m 12s
  2. Assignment : Command Line Arguments
    2m 28s

  1. Inbuilt Library Functions- Math.h Library
    21m 39s
  2. Inbuilt Library Functions- String.h Library, Time.h Library
    33m 58s
  3. Assignment : C Programming Libraries
    4m 31s

  1. Running and Debugging programs in C
    19m 18s
  2. Assignment : Running and Debugging Programs
    3m 41s

  1. Compilation and Execution
    15m 53s
  2. Assignment : Compilation and Execution
    2m 59s

  1. Advanced C Features: Macros
    9m 8s
  2. Advanced C Features: Linked List
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  3. Assignment : Macros and Linked List
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  1. Printing a String
    11m 4s
  2. Swap 2 Numbers
    24m 11s
  3. Making a Calculator
    18m 4s
  4. Printing Patterns
    35m 43s
  5. Prime Check
    19m 56s
  6. Palindrome Check
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  7. Join 2 Strings
    8m 21s
  8. Reverse a string
    14m 29s
  9. Matrix Addition
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  10. Printing Array Elements and Addresses using Pointers
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  11. Structure for Student Data
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  12. Read and Write Data in a File
    9m 4s

  1. Course Summary
    11m 7s

  1. Interview Question
    30m 24s

  1. Career Guideline
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