C Aptitude Questions And Answers -FUNCTIONS

---------------------------------- Test Your "C" Skill --------------------------------------

FUNCTIONS

1.

void main()

{

  int a,b;

  a=sumdig(123);

  b=sumdig(123);

  printf(“%d %d”,a,b);

}

sumdig(int n)

{

  static int s=0;

  int d;

  if(n!=0)

  {

  d=n%10;

  n=(n-d)/10;

  s=s+d;

  sumdig();

  }

 else

    return(s);

}

Output: 6 12

2.What error would the following function give on compilation.

F(int a,int b)

{

 int a;

 a=20;

return a;

} 

a .missing parenthesis in return statement.

B .The function should be defined as   int f(int a,int b)

C . Redeclaratin of a.

d.     None of above.

Output: C.

3.Thee is a mistake in the following code. Add a statement in it to remove it.

void main()

{

 int a;

 a=f(10,3.14);

 printf(“%d”,a);

}

f(int aa,float bb)

{

 return((float(aa)+bb);

}

Output: Add the following function prototype in main()

  float f(int aa,float bb);

4. Point error in the following code.

void main()

{

 int a=10;

 void f();

 a=f();

 printf(“%d”,a);

}

void f()

{

 printf(“HI”);

}

Output:- In spite of decelerating that the function will return void the program is trying to collect the value in a variable.

5.Point error if any

void main()

{

 int b;

 b=f(20);

 printf(“%d”,b);

 }

int f(int a)

{

  a>20?return(10):return(20);

}

Output:- Return statement can not be used in format as shown in the conditional operator instead it should be as follows

  return(a>20?10:20);

6. A function can not be defined inside another function. 

a. true

b. false

Output: a.

7.Will the following function work?<yes/no>

f1(int a, int b)

{

   return(f2(20));

}

f2(int a)

{

 return(a*a);

}

Output:-YES.

8.What are following two notations of defining functions commonly known as

 int f(int a, float b)

{

  /* some code */

}

int f(a,b)

int a, float b;

{

  /* some code */

}

Output:- The first one is known as ANSI notation. 

And the second one is known as Kernighan and Ritche.

or simply K & R notation

9.In function two return statements should not occur successively.

 a. True

 b.  False

Output:- a.

10.In C all functions except main() can be called recursively.

Output:- FALSE. 

Any function including main() can be called recursively.

11. Usually recursion works slower than loops.

 a. True

 b. False

Output:- a.

12.Is it true that too many recursive calls may result in stack overflow?

Output:- TRUE.

13. How many times the following program prints ‘ITChallengers’?

void main()

{

 printf(“\n ITChallengers”);

 main();

}

a.      infinite.

b.     32767 times

c.      65535 times

d.     Till stack doesn’t overflow.

Output:- D