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What is difference between Prefix & Postfix (++i ,--i & i++ , i--)

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Prefix and postfix increment/decrement operators differ in whether they increment/decrement the variable before or after assignment. With prefix (++i, --i), the operation is performed before assignment, changing the value. With postfix (i++, i--), the original value is assigned before the operation, which doesn't change the value until later. For example, if i=5, then ++i results in i=6, while i++ results in i=6 but uses the original value of 5 for any other calculations in that statement.

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What is difference between Prefix & Postfix (++i ,--i & i++ , i--)
So what is the difference???? Prefix Postfix The ++ or -- symbol is used before the variable. The ++ or -- symbol is used after the variable. Example: ++i or --i Exmple i++ or i-- It means : i= i+1 or It means: i= i+1 or i= i-1 i= i-1
It will be easy for u to understand these if u keep two things in ur mind. That is : In prefix : First increment / decrement by 1 then assign . In postfix: First assign then increment/ decrement by 1 .
In prefix: int i =5; ++i; Output: 6 It works like: i = ++i ; // First increment = i+1; = 5+1; = 6; int i = 6; // Then assign Note: In program the last & final value is accepted. In postfix: int i =5; i++; Output: 6 It works like: int i = 5; // First assign i =i++; // Then increment = i+1; = 5+1; =6; Note: In program the last & final value is accepted.
**In prefix : First increment / decrement then assign** If i and j are two variables then : int i, j ; i=9; j=++i; Output: i & j is : 10 10 Here, Compiler first add 1 to the initial value i=9. Then it use the new incremented value in the same statement.
**In prefix : First assign then increment / decrement ** If i and j are two variables then : int i, j ; i=9; j=i++; Output: i & j is : 10 9
Try it yourself: - -i & i- - Hint: i = i -1;

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What is difference between Prefix & Postfix (++i ,--i & i++ , i--)

  • 1. What is difference between Prefix & Postfix (++i ,--i & i++ , i--)
  • 2. So what is the difference???? Prefix Postfix The ++ or -- symbol is used before the variable. The ++ or -- symbol is used after the variable. Example: ++i or --i Exmple i++ or i-- It means : i= i+1 or It means: i= i+1 or i= i-1 i= i-1
  • 3. It will be easy for u to understand these if u keep two things in ur mind. That is : In prefix : First increment / decrement by 1 then assign . In postfix: First assign then increment/ decrement by 1 .
  • 4. In prefix: int i =5; ++i; Output: 6 It works like: i = ++i ; // First increment = i+1; = 5+1; = 6; int i = 6; // Then assign Note: In program the last & final value is accepted. In postfix: int i =5; i++; Output: 6 It works like: int i = 5; // First assign i =i++; // Then increment = i+1; = 5+1; =6; Note: In program the last & final value is accepted.
  • 5. **In prefix : First increment / decrement then assign** If i and j are two variables then : int i, j ; i=9; j=++i; Output: i & j is : 10 10 Here, Compiler first add 1 to the initial value i=9. Then it use the new incremented value in the same statement.
  • 6. **In prefix : First assign then increment / decrement ** If i and j are two variables then : int i, j ; i=9; j=i++; Output: i & j is : 10 9
  • 7. Try it yourself: - -i & i- - Hint: i = i -1;