Mixed Mode Expression and Type Conversions

Mixed Mode Expression and Type Conversions

When the variables and constants of different types are mixed in an expression ,they are all converted to the same type .

The compiler converts all operands up to the type of the largest operand , which is called type promotion .

Generally , the lower type of the operator  is promoted to higher type operand and the result will be of the higher type .

The ordering the data type is :

char < int < long < float <double .

Also , an unsigned value out ranks the corresponding signed type .

Conversion Rules :

The following are the rules applicable to the arithmetic operations between two operators having different data types .

·       If char and short int values are used as operands , the char operand is automatically elevated to int .

·       If float and double values are used as operands  , the float operand is automatically elevated to double .

·       If int and float values are used as operands , the int operand is automatically elevated to float .

·       If float and double values are used as operands ,the float is automatically elevated to double .

·       If long and unsigned int are used as operands , both the operands are automatically elevated to unsigned long.

Type Casting :

To convert the value of an expression to a different type ,the expression must be preceded by the name of the desired data type , enclosed in parenthesis ; (data type) expression .

This type of conversion is known as type casting . The operators with in C are grouped hierarchically  according  to their precedence (i.e, order of evaluation).

Operations with higher precedence are carried out before operations having a lower precedence . The natural order of evaluation can be altered through the use of paranthesis.

The arithmetic operators * , / and % fall in to precedence group , + and – falls in to another . The first group has a higher precedence than the second one .

The order in which consecutive operations with in the same precedence group are carried out is known as associately .with in each of the precedence groups described above , the associativity is from left to right.

Example Program:

Output :

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