-=

-=（Compound subtraction）

*Description
Arithmetic operator used between variables or constants. "-=" is an abbreviation.

*Syntax

x += y;   // It is equal to x = x + y;
x -= y;   // It is equal to x = x - y; 
x *= y;   //It is equal to x = x * y; 
x /= y;   // It is equal to x = x / y; 

*Parameters
x: variable in any data type
y: variable or constant in any data type

*Example

x = 2;
x += 4;      // x = 6
x -= 3;      // x = 3
x *= 10;     // x = 30
x /= 2;      // x = 15

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