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Frequently Asked c interview questions and answers for freshers Page 35

(#M40029345) C QUESTION C Keep an EYE

Q. Predict the output or error
main()
{
int i=5,j=6,z;
printf("%d",i+++j);
}

A. 11

Explanation:the expression i+++j is treated as (i++ + j)

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(#M40029344) C QUESTION C Keep an EYE

Q. Predict the output or error

A. main()
{
main();
}

A. Runtime error : Stack overflow.

Explanation: main function calls itself again and again. Each time the function is called it's return address is stored in the call stack. Since there is no condition to terminate the function call, the call stack overflows at runtime. So it terminates the program and results in an erro

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(#M40029342) C QUESTION C Keep an EYE

Q. Do you know pragma directives in c?

A. Pragma is implementation specific directive i.e each pragma directive has different implementation rule and use. If compiler does not recognize particular pragma it simply ignore that pragma statement without showing any error or warning message and execute the whole program assuming this pragma statement is not present.

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(#M40029339) C QUESTION C Keep an EYE

Q. Define Operator, Operand, and Expression in 'C'?

A. Operators are symbols which take one or more operands or expressions and perform arithmetic or logical computations. Operands are variables or expressions which are used in operators to evaluate the expression.
Combination of operands and operators form an expression

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(#M40029338) C QUESTION C Keep an EYE

Q. Differentiate between a linker and linkage?

A. A linker converts an object code into an executable code by linking together the necessary build in functions. The form and place of declaration where the variable is declared in a program determine the linkage of variable.

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(#M40029336) C QUESTION C Keep an EYE

Q. What is an argument? Differentiate between formal arguments and
actual arguments?

A. An argument is an entity used to pass the data from calling function to the called function. Formal arguments are the arguments available in
the function definition. They are preceded by their own data types.
Actual arguments are available in the function call

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(#M40029335) C QUESTION C Keep an EYE

Q. What is an lvalue?

A. An lvalue is an expression to which a value can be assigned. The lvalue expression is located on the left side of an assignment statement, whereas an rvalue is located on the right side of an assignment statement. Each assignment statement must have an lvalue and an rvalue. The lvalue expression must reference a storable variable in
memory. It cannot be a constant

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(#M40029333) C QUESTION C Keep an EYE

Q. What is modular programming?

A. If a program is large, it is subdivided into a number of smaller
programs that are called modules or subprograms. If a complex
problem is solved using more modules, this approach is known as
modular programming

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(#M40029332) C QUESTION C Keep an EYE

Q. How are pointer variables initialized?

A. Pointer variable are initialized by one of the following two ways
- Static memory allocation
- Dynamic memory allocation

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(#M40029331) C QUESTION C Keep an EYE

output?
Q. How does a C program come to know about command line arguments?

A. When we execute our C program, operating system loads the program into memory. In case of DOS, it first loads 256 bytes into memory, called program segment prefix. This contains file tables,environment segment, and command line information. When we compile the C program
the compiler inserts additional code that parses the command, assigning it to the argv array, making the arguments easily accessible within our C program

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