Miscellaneous operators

Other operators in C are,

• Functional call operator ( )
• Array subscript operator [ ]
• Member select operator
  • Direct member access operator .(dot operator)
  • Indirect member access operator (-> arrow operator)
• Indirection operator (*)
• Conditional operator (?:)
• Comma operator
• Sizeof operator
• Address of operator (&)

Conditional Operator

• General form of conditional operator is E1?E2:E3
• Where E1,E2 and E3 are sub expressions
• The sub-expression E1 is evaluated first.
• If it evaluates to a non-zero value (true) then E2 is evaluated and E3 is ignored.
• If E1 evaluates to zero (i.e., false), then E3 is evaluated and E2 is ignored

?:

Comma Operator

• Not every instance of comma symbol is a comma operator
• Comma separating arguments in function call or in declaration / definition statements are termed to be comma separators
• The comma operator guarantees left to right evaluation
• In expression E1,E2,E3,…,En are evaluated in left to right order
• The result and type of evaluation of the overall expression is the value and type of the evaluation of the rightmost sub-expression i.e.En
• The comma operator has least precedence

,

Size of Operator

• Sizeof operator is used to determine size in bytes
• General form:
  • sizeof(expression)
  • sizeof expression
  • sizeof(typename)
• The type of result of evaluation is int
• The operand of sizeof operator is not evaluated

sizeof

Address-of Operator

• Address-of operator must appear toward the left side of its operand
• Syntax: &operand
• It cannot be applied to constants, expressions, and to variables stored in register class

&

Example

Illustration of comma operator

#include<stdio.h>
int main()
{
	int a,b;
	a=1,2,3,4,5;
	b=(1,2,3,4,5);
	printf("a=%d,b=%d",a,b);
	return 0;
}

Output

a=1,b=5

Illustration of size of operator

#include<stdio.h>
int main()
{
	int a=1,b,c;
	b=sizeof(++a);
	c=sizeof(2+3);
	printf("a=%d,b=%d,c=%d",a,b,c);
	return 0;
}

Output

a=1,b=2,c=2

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