When in C ++Using i in ++Or++ i?

The increment operator is used to increase the value by one, and the decrement is the opposite. The decrement operator decreases the value by one.

pre-increment (++ i) -Increment the value before assigning it to a variable1.

post-increment (i ++) -After assigning a value to a variable, the value will increment.

This is C ++i in the language ++and++ the syntax of i

++variable_name;　//　Pre-increment
variable_name++;　//　Post-increment

Here,

variable_name-The variable name given by the user.

This is C ++Example of increment and decrement in the 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 result

The pre-incremented value:　56789
The post-incremented value:　101112131415

In the above program,main()There is code for incrementing and decrementing before and after in the function. Increment the integer variable i until the value of i is less than10，then increment, until the value of i is less than15.

while(++i <　10　)
printf("%d\t",i);
cout << "\nThe post-incremented value: " << i;
while(i++　<　15　)
printf("%d\t",i);