Assignments

Multiple Assignment

A variable can be assigned value multiple times.

Let's look at this example:

#include <iostream> // So cin and cout can be used. using namespace std; int main() { int num = 1; cout << num << endl; num = 2; num = 5; cout << num << endl; int anotherNum = num; anotherNum = anotherNum + 2; // 5 + 2 cout << anotherNum; }

Output:

1 5 7

In this case num has been assigned value multiple times.

Variables can be assigned values of other variables (line 14).

Also a variable can receive a new value by using it's current value (line 15).

Assignment operators

They assign values and make the code shorter.

+= operator

num += 2 is the same as num = num + 2.

Example:

int num = 3; num += 1; cout << num;

Output:

4

-= operator

num -= 5 is the same as num = num - 5.

Example:

int num = 4; num -= 3; cout << num;

Output:

1

*= operator

num *= 7 is the same as num = num * 7.

Example:

int num = 8; num *= 3; cout << num;

Output:

24

/= operator

num /= 10 is the same as num = num / 10.

Example:

int num = 24; num /= 4; cout << num;

Output:

6