Punuptech

C has special shorthand that simplifies coding of certain type of assignment statements.

Example

a = a + 2;

can be written as

a + =2;     compound assignment statement

This operator  += tells the compiler that a is assigned the value of  a+2.

This shorthand works for all binary operators  in C.

General form:

<variable> < operator> = <variable/constant/expression>

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Assignment Operators

The Assignment Operator evaluates an expression on the right of the expression and substitutes it to the value or variable on the left of the expression.

Example

x = a + b

Here the value of a + b is evaluated and substituted to the variable x.

In addition, C has a set of shorthand assignment operators of the form.

var oper = exp;

Here var is a variable, exp is an expression and oper is a C binary arithmetic operator. The operator oper = is known as shorthand assignment operator

*  Only 1 variable is allowed on the left side of ‘=’.

Example :

z= k * i; is  valid statement.

where k * i= z; is invalid statement.

• If a value is assigned to left side of ‘=’ , error message will be displayed on screen.

Example :

a+b=c;

Error :  Lvalue  required.

• An arithmetic instruction  can be used for storing characters constants in character variables.

char a,b,d;

c = ‘+’;

When we do this, the ASCII value of the characters are stored in the variables. As ‘a’ stores 70(ASCII value of ‘F’), ‘b’ stores 71(G=71) and so on.

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