Assignment Operators in C || Lesson 16 || C Programming || Learning Monkey ||

Assignment Operators in C

In this class, we will try to understand Assignment Operators in C.

There are two types of assignment operators.

Simple Assignment Operator
Compound Assignment Operator

The image below shows the classification of assignment operators.
Simple Assignment Operator

The simple operator ” = ” is used to store a constant value, the value of another variable, or the result of expression evaluation into a variable.

For example, a = 15, b = c, or c = 20 + 40.

A critical point to understand is the assignment operator requires an Lvalue as its left operand.

An Lvalue represents an object stored in computer memory, not a constant or computation result.

An object stored in the computer memory means a variable.

The left operand of the variable should always be a variable.

It should not be an expression or a constant.

For example, 15 = b, a + b = 23, such a left operand use is not allowed.
Compound Assignment Operator

The other type of assignment operator is the compound assignment operator.

C supports a lot of compound assignment operators.

In this class, we will discuss only a few of them. [ +=, -=, *=, /=, %= ]

The compound assignment operator uses the old value of the variable to compute the new value.

For example, a += 2 is how we use the compound assignment operator.

Here a and 2 are operands, and += is a compound assignment operator.

+= means the old value of a is added with 2, and the new value is stored in the a.

a += 2 is a short form of a = a + 2 expression.

If the value of a is initialized to 12. [a = 12]

a += 2 or a = a + 2 results in 14.

The new value 14 will be stored in a.

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