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When to use i++ or ++i in C++?
Increment operators are used to increase the value by one while decrement works opposite. Decrement operator decrease the value by one.
Pre-increment (++i) − Before assigning the value to a variable, the value is incremented by one.
Post-increment (i++) − After assigning the value to a variable, the value is incremented.
Here is the syntax of i++ and ++i in C++ language,
++variable_name; // Pre-increment variable_name++; // Post-increment
Here,
variable_name −Name of the variable given by user.
Here is an example of pre and post increment in C++ language,
Example
#include <iostream>
using namespace std;
int main() {
int i = 5;
cout << "The pre-incremented value: " << i;
while(++i < 10 )
cout<<"\t"<<i;
cout << "\nThe post-incremented value: " << i;
while(i++ < 15 )
cout<<"\t"<<i;
return 0;
}Output
The pre-incremented value: 56789 The post-incremented value: 101112131415
In the above program, the code of pre and post increment exists in main() function. The variable i of integer type is pre-incremented until value of i is less than 10 and post-incremented until the value of i is less than 15.
while(++i < 10 )
printf("%d\t",i);
cout << "\nThe post-incremented vaue : " << i;
while(i++ < 15 )
printf("%d\t",i);
Updated on: 26-Jun-2020
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