Important C Interview question test Practice Questions & Worked Solutions

Q1 Medium • TCS, Infosys

What is the problem with the below code? <code>#include <stdio.h> int main() { printf( \"Declare x next\" ); int x; retu 0; }</code>

A Call to wrong interger X value in printf

B Integer X declaration should be first

C Retu ing wrong value

D Printf syntax is wrong

Q2 Medium • TCS, Infosys

enum x {a=1,b,c,d,f=60,y} printf(\"%d\",y);

A 66

B 6

C 5

D 61

Q3 Medium • TCS, Infosys

What is answer for the following code: <code>Struct x { int i; char c; } union y{ struct x a; double d; }; printf(\"%d\",sizeof(union y));</code>

A 1

B 5

C 4

D 8

Q4 Medium • TCS, Infosys

What is the output of the following programme? If we Enter Input as: 6? <code>#include <stdio.h> int main() { int c, n, fact = 1; printf(\"Enter a number to calculate it\'s factorial\ \"); scanf(\"%d\", &n); for (c = 1; c <= n; c++) fact = fact * c; printf(\"Factorial of %d = %d\ \", n, fact); retu 0; }</code>

A 728

B 720

C 760

D 66

Q5 Medium • TCS, Infosys

Which if statement is correct to find Leap Year! <code> 1. if ( year%400 == 0) .......... 2. else if ( year%100 == 0) .......... 3. else if ( year%4 == 0 ) .......... 4. else ..........</code>

A 1

B 2

C 3

D 4

Q6 Medium • TCS, Infosys

What are the real data types in C language?

A C. Float, Double, long int

B B. Double, Long int, Float

C A. Short int, Double, Long int

D D. Float, double, long double

Q7 Medium • TCS, Infosys

What is the output of the following program? #include<stdio.h> int main() { printf(\"%f\ \", log(46.0)); retu 0; }

A include<math.h> missing

B Compile Error

C Run time Error

D include<stdlib.h> missing

Q8 Medium • TCS, Infosys

To Round off a float value to an integer value, what is the correct method?

A fh = (int) (x+0.7)

B fh = (int) x+0.7

C fh = int(y+0.7)

D fh = x+0.7 (int)

Q9 Medium • TCS, Infosys

What should be the out of the below C programme? <pre>#include<stdio.h> main() { int i=1; while ( i++<=5) prinf(\"%d \", i++); }</pre>

A 4 9 8

B 3 2 1

C 2 5 4

D 2 4 6

Q10 Medium • TCS, Infosys

Which statment is true for C Language?

A Middle level language

B High level programming language

C Low level programming language

D Low level programming language

Q11 Medium • TCS, Infosys

What punctuation is used to indicate beginning and end of a code block?

A ( )

B [ ]

C { }

D ;;

Q12 Medium • TCS, Infosys

The C Compiler generates which file?

A Object code

B Executable code

C Assembly Code

D No code

Q13 Easy

In ISO C17, given int values[3] = {4, 7, 9}; what is the value of values[0]?

A 4

B 7

C 9

D 0

Q14 Easy

In ISO C17, which operator gives the remainder after integer division?

A %

B //

C **

D mod

Q15 Easy

In ISO C17, which header declares strlen?

A <string.h>

B <ctype.h>

C <limits.h>

D <stdlib.h>

Q16 Easy

In ISO C17, what is the value of 7 / 2 when both operands have type int?

A 3

B 3.5

C 4

D The expression is invalid

Q17 Medium

In ISO C17, x is initially 0. What happens in the expression x != 0 && 10 / x > 1?

A The expression evaluates to 0 without evaluating 10 / x due to short-circuit evaluation.

B Division by zero necessarily occurs.

C Both operands must always be evaluated.

D A compiler syntax error is generated.

Q18 Medium

In ISO C17, what is sizeof text for char text[] = "cat";? Give the result in C bytes.

A 4

B 3

C 5

D 8

Q19 Medium

In ISO C17, which declaration makes p a pointer through which the pointed-to int cannot be modified?

A const int *p;

B int *const p = 0;

C int *p;

D volatile int *p;

Q20 Medium

In ISO C17, which printf conversion is appropriate for a value of type size_t?

A %zu

B %d

C %f

D %lu

Important C Interview question test Practice Questions (20)