What do += and -= mean in C language?

The = and -= operators in C language are assignment operators, which allow shortcuts to add or subtract a value from the value of a variable. The = operator increases the value of a variable by a specified amount, while the -= operator decrements the value of a variable by a specified amount.

The role of = and -= operators in C language

In C language, = and - = are assignment operators, they add or subtract the value of a variable to a constant or the value of another variable.

• = Operator:

  • The value of the variable is increased by the given value.
  • Syntax: variable = value;
  • For example: x = 5; Increase the value of x by 5.

• -= Operator:

  • The value of the variable is reduced by the given value.
  • Syntax: variable -= value;
  • For example: y -= 3; Reduce the value of y by 3 .

Benefits:

Using the = and -= operators allows you to concisely update the value of a variable without having to write multiple assignments statement. For example, the following code uses the = operator to increase the value of x by 5:

<code class="c">x = x + 5;</code>

You can use the following more concise writing:

<code class="c">x += 5;</code>

Note:

• The = and -= operators can only be used with numeric types.
• They only modify the variable itself, not a copy of the value stored in the variable.
• They are left associative operators, which means they execute from right to left.

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