Pre-increment and Post-increment in C/C++

Here we will see what is the pre-increment and post-increment in C or C++. The pre-increment and post-increment both are increment operators. But they have little differences.

The pre-increment operator increments the value of a variable at first, then sends the assign it to some other variable, but in the case of postincrement, it at first assign to a variable, then increase the value.

Example

#include<iostream>
using namespace std;
main() {
   int x, y, z;
   x = 10;
   y = 10;
   z = ++x; //z will hold 11
   cout << "Z: " << z << endl;
   z = y++; //z will hold 10, then y will be 11
   cout << "Z: " << z << " and y is: " << y << endl;
}

Output

Z: 11
Z: 10 and y is: 11

The precedence of post increment is more than precedence of pre increment, and their associativity is also different. The associativity of pre increment is right to left, of post increment is left to right.

Nishtha Thakur

Published on 26-Apr-2019 12:58:28

• Related Questions & Answers
• Pre-increment and Post-increment concept in C/C++?
• Pre-increment & Post-Increment in C++
• Write a C program to demonstrate post increment and pre increment operators
• Pre & post increment operator behavior in C, C++, Java, and C#
• Pre-increment (or pre-decrement) in C
• Increment ++ and decrement -- Operators in C++
• Increment and Decrement Operators in C#
• Increment ++ and Decrement -- Operator Overloading in C++
• Post and Pre incremented of arrays in C language
• What are increment (++) and decrement (--) operators in C#?
• Way to increment a character in C#
• Python Increment and Decrement Operators
• Amortized analysis for increment in counter in C++
• Increment and decrement operators in Java
• Sort in MySQL and increment value?