Operators in C

The operators are types of symbols that inform a compiler for performing some specific logical or mathematical functions. The operators serve as the foundations of the programming languages. Thus, the overall functionalities of the C programming language remain incomplete if we do not use operators. In simpler words, the operators are symbols that help users perform specific operations and computations- both logical and mathematical on the operands. Thus, the operators operate on the available operands in a program.

In this article, we will take a closer look at Operators in C according to the GATE Syllabus for CSE (Computer Science Engineering). Read ahead to know more.

Table of Contents

• Use Of Operators In C
• Types Of Operators In C
• Precedence Of Operators In C
• Practice Problems On Operators In C
• FAQs

Use of Operators in C

The operators basically serve as symbols that operate on any value or variable. We use it for performing various operations- such as logical, arithmetic, relational, and many more. A programmer must use various operators for performing certain types of mathematical operations. Thus, the primary purpose of the operators is to perform various logical and mathematical calculations.

The programming languages like C come with some built-in functions that are rich in nature. The use of these operators is vast. These operators act as very powerful and useful features of all the programming languages, and the functionality of these languages is pretty much useless without these. These make it very easy for programmers to write the code very easily and efficiently.

Types of Operators in C

Various types of operators are available in the C language that helps a programmer in performing different types of operations. We can handle different operations in a program using these types of operators:

• Relational Operators
• Arithmetic Operators
• Logical Operators
• Assignment Operators
• Bitwise Operators
• Misc Operators

Relational Operators

We use the relational operators in c when we would like to compare the values available for two given operands. Here is a table that states all the relational operators available in the C language, along with their individual functions.

Note – Here, we get 1 as output when the condition is true, and 0 as output when the condition is false.

Arithmetic Operators

The arithmetic operators in C language help a user perform the mathematical operations as well as the arithmetic operations in a program, such as subtraction (-), addition (+), division (/), multiplication (*), the remainder of division (%), decrement (–), increment (++).

The arithmetic operators are of two major types:

• Binary Operators – It works using two of the operators, such as -, +, /, *.
• Unary Operators In C – It works by making use of just a single operand (value), such as — and ++.
• Also, Explore Ternary Operator in C.

Binary Operators

Here is a table that states all the binary arithmetic operators available in the C language, along with their individual functions. If P = 50 and Q = 25, then:

Unary Operators

Here is a table that states all the unary arithmetic operators available in the C language, along with their individual functions. These are increment and decrement operators. If P = 50 and Q = 25, then:

Prefix and Postfix Increment/ Decrement Operators

The decrement operators and increment operators are of two major types:

Prefix – When we use the operator before the available variable in a program as a prefix, it is known as a prefix operator. In a prefix increment operator, the program first adds 1 and then assigns the resultant value to the variable. While in a prefix decrement operator, the program first subtracts 1 and then assigns the resultant value to the variable. For example, ++a and –a.

Postfix – When we use the operator after the available variable in a program as a postfix, it is known as a postfix operator. In a postfix increment operator, the program first assigns the value to the variable, then adds 1, and then assigns the resultant value. While in a postfix decrement operator, the program first assigns the value to the variable, then subtracts 1, and then assigns the resultant value. For example, a++ and a–.

Here is a table that states all the prefix and postfix unary arithmetic operators available in the C language, along with their individual functions. These are increment and decrement operators.

Logical Operators

The logical operators in c help a user determine if the results would be true or false. Here is a table that states all the logical operators available in the C language, along with their individual functions. If P = 1 and Q = 0, then:

Assignment Operators

We use the assignment operators in c for assigning any value to the given variable. Here is a table that states all the logical operators available in the C language, along with their individual functions.

Bitwise Operators

We use bitwise operators in c for performing the operations of bit-level on various operands. It first converts the operators to bit-level, and after that, it performs various calculations.

The Bitwise operators basically work on the bits, and we perform bit-by-bit operations using them. Here is the truth table for the ^, &, and | here:

If we assume that P = 60 and Q = 13 using the binary format, then it will appear as follows:

P = 0011 1100

Q = 0000 1101

—————–

P ^ Q = 0011 0001

P | Q = 0011 1101

P & Q = 0000 1100

~ P = 1100 0011

Here is a table that states all the bitwise operators available in the C language, along with their individual functions. If we assume that the value of variable P = 60 and variable Q = 13, then:

Misc Operators

Apart from all the operators that we have discussed above, the C programming language uses a few other crucial operators, that include operators, (such as ? : and sizeof). Here is a table that states all the misc operators available in the C language, along with their individual functions.

Precedence of Operators in C

The precedence of the operators in C language helps in determining the preference in which the operators must be evaluated in a program. Some operators display higher precedence as compared to the others in the program. For instance, the precedence of the multiplication operator here is much higher than that of the addition operator. Explore, Operator Precedence and Associativity in C to know more.

Let us consider an example where a = 5 + 2 * 7; so here, the variable a gets assigned with the value 19 and not 70. It is because the precedence of the multiplication operator (*) is higher than that of the addition operator (+). Thus, the program would first multiply 2 with 7, produce 14, and then add it with 5 to get 19 as the final result.

The table below displays the operators according to their precedence. The ones with higher precedence appear at the very top, and the ones with lower precedence appear at the very bottom. In any given expression, the evaluation of the operators with higher precedence occurs first.

Also, Explore: Increment and Decrement Operators in C, Left Shift Operator in C & Modulus Operator in C

Practice Problems on Operators in C

1. Take a look at the following program:

#include <stdio.h>

int main()

{

int x;

x = 2;

printf( “%d\n”, x );

printf( “%d\n”, x++ );

printf( “%d\n\n”, x );

x = 2;

printf( “%d\n”, x );

printf( “%d\n”, ++x );

printf( “%d\n”, x );

return 0;

}

Output:

The output of the code mentioned above will produce a result as:

A.

2 2 3 2 3 3

B.

2 3 3 2 2 3

C.

3 2 3 3 3 2

D.

3 3 2 3 2 2

Answer – A.

2 2 3 2 3 3

2. Take a look at the following snippet of a code:

int a = 10;

int b = i++%5;

What will be the value of a and b after we execute the code?

A. a is 10, and b is 1.

B. a is 10, and b is 0.

C. a is 11, and b is 0.

D. a is 11, and b is 1.

Answer – C. a is 11, and b is 0.

3. Take a look at the following snippet of a code:

int a = 10;

int b = ++i%5;

What will be the value of a and b after we execute the code?

A. a is 10, and b is 1.

B. a is 10, and b is 0.

C. a is 11, and b is 0.

D. a is 11, and b is 1.

Answer – D. a is 11, and b is 1.

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Also Explore,

• Logical Operators in C
• Operators in C
• Relational Operators in C
• Comma Operator in C
• Modulus Operator in C
• Constants in C
• Data Types in C
• Double Data Type in C