Operators are the symbol which operates on value or a variable. For example: + is a operator to perform addition.
C programming language has wide range of operators to perform various operations. For better understanding of operators, these operators can be classified as:
|Operators in C programming|
|Increment and Decrement Operators|
|Operator||Meaning of Operator|
|+||addition or unary plus|
|-||subtraction or unary minus|
|%||remainder after division( modulo division)|
Example of working of arithmetic operators
/* Program to demonstrate the working of arithmetic operators in C. */
printf("Remainder when a divided by b=%d\n",c);
Remainder when a divided by b=1
Here, the operators +, - and * performed normally as you expected. In normal calculation,
9/4 equals to 2.25. But, the output is 2 in this program. It is because, a and b are both integers. So, the output is also integer and the compiler neglects the term after decimal point and shows answer 2 instead of 2.25. And, finally
a%b is 1,i.e. ,when
a=9 is divided by
b=4, remainder is 1.
Suppose a=5.0, b=2.0, c=5 and d=2
In C programming,
Note: % operator can only be used with integers.
-- are called increment and decrement operators respectively. Both of these operators are unary operators, i.e, used on single operand.
++ adds 1 to operand and
-- subtracts 1 to operand respectively. For example:
Let a=5 and b=10
a++; //a becomes 6
a--; //a becomes 5
++a; //a becomes 6
--a; //a becomes 5
i++ is used as prefix(like:
++var will increment the value of var and then return it but, if
++ is used as postfix(like: var++), operator will return the value of operand first and then only increment it. This can be demonstrated by an example:
printf("%d\n",c++); //this statement displays 2 then, only c incremented by 1 to 3.
printf("%d",++c); //this statement increments 1 to c then, only c is displayed.
The most common assignment operator is
=. This operator assigns the value in right side to the left side. For example:
var=5 //5 is assigned to var
a=c; //value of c is assigned to a
5=c; // Error! 5 is a constant.
Relational operators checks relationship between two operands. If the relation is true, it returns value 1 and if the relation is false, it returns value 0. For example:
> is a relational operator. If a is greater than b, a>b returns 1 if not then, it returns 0.
Relational operators are used in decision making and loops in C programming.
|Operator||Meaning of Operator||Example|
|==||Equal to||5==3 returns false (0)|
|>||Greater than||5>3 returns true (1)|
|<||Less than||5<3 returns false (0)|
|!=||Not equal to||5!=3 returns true(1)|
|>=||Greater than or equal to||5>=3 returns true (1)|
|<=||Less than or equal to||5<=3 return false (0)|
Logical operators are used to combine expressions containing relation operators. In C, there are 3 logical operators:
|Operator||Meaning of Operator||Example|
|&&||Logial AND||If c=5 and d=2 then,((c==5) && (d>5)) returns false.|
|||||Logical OR||If c=5 and d=2 then, ((c==5) || (d>5)) returns true.|
|!||Logical NOT||If c=5 then, !(c==5) returns false.|
For expression, ((c==5) && (d>5)) to be true, both c==5 and d>5 should be true but, (d>5) is false in the given example. So, the expression is false. For expression
((c==5) || (d>5)) to be true, either the expression should be true. Since,
(c==5) is true. So, the expression is true. Since, expression
(c==5) is true,
!(c==5) is false.
Conditional operator takes three operands and consists of two symbols ? and : . Conditional operators are used for decision making in C. For example:
If c is greater than 0, value of c will be 10 but, if c is less than 0, value of c will be -10.
A bitwise operator works on each bit of data. Bitwise operators are used in bit level programming.
|Operators||Meaning of operators|
|^||Bitwise exclusive OR|
Bitwise operator is advance topic in programming . Learn more about bitwise operator in C programming.
Comma operators are used to link related expressions together. For example:
The sizeof operator
It is a unary operator which is used in finding the size of data type, constant, arrays, structure etc. For example:
printf("Size of int=%d bytes\n",sizeof(a));
printf("Size of float=%d bytes\n",sizeof(b));
printf("Size of double=%d bytes\n",sizeof(c));
printf("Size of char=%d byte\n",sizeof(d));
Size of int=4 bytes
Size of float=4 bytes
Size of double=8 bytes
Size of char=1 byte
Conditional operators (?:)
Conditional operators are used in decision making in C programming, i.e, executes different statements according to test condition whether it is either true or false.
Syntax of conditional operators
If the test condition is true,
expression1 is returned and if false
expression2 is returned.
Example of conditional operator
printf("Enter l if the year is leap year otherwise enter 0: ");
/*If test condition (feb=='l') is true, days will be equal to 29. */
/*If test condition (feb=='l') is false, days will be equal to 28. */
printf("Number of days in February = %d",days);
Enter l if the year is leap year otherwise enter n: l
Number of days in February = 29
Other operators such as &(reference operator), *(dereference operator) and ->(member selection) operator will be discussed in pointer chapter.