In C, the assignment operator can be used within any valid C expression. The most commonly used assignment operator is =. The general from of the assignment as required.
For example

x = 25;
y = z + 7;

The two terms; lvalue and rvalue are frequently encountered in error messages while compiling a C program. An lvalue is any object that can occur on the left side of an assignment statement. For all practical purposes, lvalue means variable and the term rvalue refers to expression on the right of the assignment, and simply means the value of an expression.

Expression such as

i = i + 5

In which the variable on the left hand side repeated immediately on the right, can be written in the composed form:

i +=5;

The operator += is called an assignment operator.

Most binary operator have corresponding assignment operator op=, where op is one of +, -, *, /, <<, >>, &, , |

If expr1 and expr2 are expression, then

Expr1 op= expr2;

Is equivalent to

Expr1= (expr1) op(expr2);

Expect that expr1 is computed only once. Notice the parentheses around expr2:

X *= y+1;

Means

X=x*y+1;

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