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c program to swap two numbers without using a third variable

Swap two numbers without using a third variable | Swap Two numbers without using a temporary variable: There are 4 tricks to swap two numbers without using a third variable. You can use of them for your program. However the trick #4 is the smartest, fastest & easiest of all. The trick used is nothing but basic mathematics fundamentals like: multiplication, division and addition , subtraction. Further explanation is given below:

 Trick #1

 
  Trick #1: Addition, subtraction

A=A+B;
B=A-B;
A=A-B

Program #1: Swap two numbers without using third variable using addition and subtraction.

 Trick #2

 
  Trick #2: Multiplication, Division

A=A X B;
B=A/B;
A=A/B;

Program #2: Swap two numbers without using third variable using Multiplication and division

 Trick #3

 
 Trick #3: XOR Operation,

A=A^B;
B=A^B;
A=A^B;

Program #3: Swap two numbers without using third variable : XOR operation trick.

 Trick #4

 
Trick #4: Basic logic: 1 Line Trick,

A=A+B – (B=A);
Program #4Swap two numbers without using third variable: Basic Logic; 1 Line trick. 

 

 

Also See:   C program to add two numbers using for loop

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