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C Programming Questions and Answers – Basics of Functions

C Programming Questions and Answers – Basics of Functions

 

1.What is the output of this C code?

 

#include <stdio.h>

int main()

{

void foo();

printf(“1 “);

foo();

}

void foo()

{

printf(“2 “);

}

a) 1 2

b) Compile time error

c) 1 2 1 2

d) Depends on the compiler

View Answer

Answer:a

 

2.What is the output of this C code?

 

#include <stdio.h>

int main()

{

void foo(), f();

f();

}

void foo()

{

printf(“2 “);

}

void f()

{

printf(“1 “);

foo();

}

a) Compile time error as foo is local to main

b) 1 2

c) 2 1

d) Compile time error due to declaration of functions inside main

View Answer

Answer:b

 

3.What is the output of this C code?

 

#include <stdio.h>

int main()

{

void foo();

void f()

{

foo();

}

f();

}

void foo()

{

printf(“2 “);

}

a) 2 2

b) 2

c) Compile time error

d) Depends on the compiler

View Answer

Answer:d

Explanation: Even though the answer is 2, this code will compile fine only with gcc. GNU C supports nesting of functions in C as a language extension where as standard C compiler doesn’t.

4.What is the output of this C code?

 

#include <stdio.h>

void foo();

int main()

{

void foo();

foo();

return 0;

}

void foo()

{

printf(“2 “);

}

a) Compile time error

b) 2

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:b

 

5.What is the output of this C code?

 

#include <stdio.h>

void foo();

int main()

{

void foo(int);

foo(1);

return 0;

}

void foo(int i)

{

printf(“2 “);

}

a) 2

b) Compile time error

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:a

 

6.What is the output of this C code?

 

#include <stdio.h>

void foo();

int main()

{

void foo(int);

foo();

return 0;

}

void foo()

{

printf(“2 “);

}

a) 2

b) Compile time error

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:b

 

7.What is the output of this C code?

 

include <stdio.h>

void m()

{

printf(“hi”);

}

void main()

{

m();

}

a) hi

b) Run time error

c) Nothing

d) Varies

View Answer

Answer:a

 

8.What is the output of this C code?

 

#include <stdio.h>

void m();

void n()

{

m();

}

void main()

{

void m()

{

printf(“hi”);

}

}

a) hi

b) Compile time error

c) Nothing

d) Varies

 

View Answer

Answer:b

 

9.What is the output of this C code?

 

#include <stdio.h>

void main()

{

m();

void m()

{

printf(“hi”);

}

}

a) hi

b) Compile time error

c) Nothing

d) Varies

View Answer

Answer:b

 

10.What is the output of this C code?

 

#include <stdio.h>

void main()

{

m();

}

void m()

{

printf(“hi”);

m();

}

a) Compile time error

b) hi

c) Infinite hi

d) Nothing

View Answer

Answer:c

 

11.What is the output of this C code?

 

#include <stdio.h>

void main()

{

static int x = 3;

x++;

if (x <= 5)

{

printf(“hi”);

main();

}

}

a) Run time error

b) hi

c) Infinite hi

d) hi hi

View Answer

Answer:d

 

12.Which of the following is a correct format for declaration of function?

a) return-type function-name(argument type);

b) return-type function-name(argument type) {}

c) return-type (argument type)function-name;

d) Both (a) and (b)

View Answer

Answer:a

 

13.Which of the following function declaration is illegal?

a) int 1bhk(int);

b) int 1bhk(int a);

c) int 2bhk(int*, int []);

d) All of the mentioned

View Answer

Answer:d

 

14.Which function definition will run correctly?

a) int sum(int a, int b)

return (a + b);

b) int sum(int a, int b)

{return (a + b);}

c) int sum(a, b)

return (a + b);

d) Both (a) and (b)

View Answer

Answer:b

 

15.Can we use a function as a parameter of another function? [ Eg: void wow(int func()) ] a) Yes, and we can use the function value conveniently

b) Yes, but we call the function again to get the value, not as convenient as in using variable

c) No, C does not support it.

d) This case is compiler dependent

View Answer

Answer:c

 

16.The value obtained in the function is given back to main by using ________ keyword?

a) return

b) static

c) new

d) volatile

View Answer

Answer:a

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