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Operators in C Interview Questions & Answers - Learning Mode

Operators in C Interview Questions & Answers - Learning Mode

C language supports a rich set of built-in operators. An operator is a symbol that tells the compiler to perform certain mathematical or logical manipulations. Operators can be classified based on the type of operations they perform. Different types of operators in C are Arithmetic Operators, Relational Operators, Logical Operators, Assignment Operators, Increment and Decrements Operators, Conditional Operator, Bitwise Operators and Special Operators

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Operators in C Interview Questions & Answers - Learning Mode
Try Operators in C Interview Questions & Answers - Exam Mode
Question: When should a type cast not be used?

Answer: A type cast should not be used to override a const or volatile declaration. Overriding these type modifiers can cause the program to fail to run correctly.

A type cast should not be used to turn a pointer to one type of structure or data type into another. In the rare events in which this action is beneficial, using a union to hold the values makes the programmer?s intentions clearer. Source:
Question: Write Addition of two numbers using Bitwise operators.

Answer: #include<stdio.h>

int main()
int a,b,sum, carry;
sum = a ^ b;
carry = a & b;
while (carry != 0)
carry <<= 1;
a = sum;
b = carry;
sum = a ^ b;
carry = a & b;

Question: How to convert decimal to octal and hexadecimal & binary using shift registers?

Answer: void main()
int i=12;
printf("i in integer form=%d
i in octal=%o,i in hexadecimal=%x",i,i,i);
Question: What is pointers and its uses?

Answer: Pointer is a variable which holds the address of the another variable.
for ex:int *p;
here p is a pointer which holds the address of inter variable.
uses of pointers:
1.To access array elements
2.Pointers use in dynamic memory allocation linked linked lists,trees,graphs.
3.Passing data in & out of without coping .
4.Create and manage your own data types.
Question: Can math operations be performed on a void pointer?

Answer: No. Pointer addition and subtraction are based on advancing the pointer by a number of elements. By definition, if you have a void pointer, you don?t know what it?s pointing to, so you don?t know the size of what it?s pointing to. If you want pointer arithmetic to work on raw addresses, use character pointers. Source:
Question: How I can add two numbers in c language without using Arithmetic operators?

Answer: Sum = a xor b;
carry = a and b; Source:
Question: Write a code for implementation of doubly linked list with use of single pointer in each node

Answer: Store an extra integer which stores the X-or value of addresses of previous node and the next node. Since you have the option of storing one pointer, you can easily retrieve the address of the other node {either previous or next} by performing X-or between the stored integer and the node address (stored one). Source:
Question: Why don't we add null pointer at the end of array of integer?How can we calculate the length of array of integer?

Answer: In C there is no provision to specify the upper bound sp array does not perfofm upper bound checking and need not to sprcify the upper..NULL check

Question: How will you print % character?

Answer: printf(?%%?) will print %

Question: Why n++ executes faster than n+1?

Answer: The expression n++ requires a single machine instruction such as INR to carry out the increment operation whereas, n+1 requires more instructions to carry out this operation. Source:
Question: What is a modulus operator? What are the restrictions of a modulus operator?

Answer: A Modulus operator gives the remainder value. The result of x%y is obtained by (x-(x/y)*y). This operator is applied only to integral operands and cannot be applied to float or double. Source:
Question: Assign a=56;how to separate that number(ie:5,6) and multiply(ie:5*6) using bitwise operator?

Answer: int b,c;
cout<<a; Source:
Question: How to add 2 numbers without + sign?

Answer: Ans is ::

make a try it will work
Question: How can i find size of a variable without using sizeof() operator?

Answer: #define any_size(any) (char*)(&any)-(char*)((&any)-1)

void main()


//any type of variable int c;


Question: What is a const pointer?

Answer: The access modifier keyword const is a promise the programmer makes to the compiler that the value of a variable will not be changed after it is initialized. The compiler will enforce that promise as best it can by not enabling the programmer to write code which modifies a variable that has been declared const.

A ?const pointer,? or more correctly, a ?pointer to const,? is a pointer which points to data that is const
(constant, or unchanging). A pointer to const is declared by putting Source:
Question: Write A Program With Out Using ;

Answer: void main()
int i;
if(printf("Program with out Semicolon"))
As Printf function return int(no of charecter),so The Value of i must be =0; And program should be work with out semicolon.

Question: How we can add two numbers without using + symbol?

Answer: use logicalor(|) operation to add the numbers Source:
Question: What is the use of Bitwise operators?
what is the use of unformatted Input/Output functions?

Answer: Bitwise and operator (&) is used to check that a particular bit is ON (1) or OFF (0) or to unset a particular bit and bitwise OR operator is used to set a particular bit of a constant. Source:
Question: Which bit wise operator is suitable for checking whether a particular bit is on or off ?

Answer: The bitwise AND operator. Here is an example:

enum {
KBit0 = 1,

if ( some_int & KBit24 )
printf ( ?Bit number 24 is ON
? );
printf ( ?Bit number 24 is OFF
? );

Question: Which bit wise operator is suitable for turning off a particular bit in a number ?

Answer: The bitwise AND operator, again. In the following code snippet, the bit number 24 is reset to zero.

some_int = some_int & ~KBit24; Source:

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