C Functions

Question 31

Consider the following C++ program\'

int a (int m)
{return ++m;}
int b(int&m)
{return ++m;}
int c(char &m)
{return ++m;} 

void main 0
{
      int p = 0, q = 0, r = 0; 
      p += a(b(p));
      q += b(a(q));
      r += a(c(r));
      cout<


Assuming the required header files are already included, the above program: 

• results in compilation error
• print 123
• print 111
• print 322

Question 32

What is the output of the following program ?

main (){
int x = 2, y = 5;
if(x < y) return (x = x + y);
else printf ("z1");
printf("z2");

• z2
• z1z2
• Compilation error
• None of these

Question 33

Consider the following program

main()
{
int x = 1;
printf ("%d", (*char(char *)&x)) ;
}

Assuming required header files are included and if the machine in which this program is executed is little-endian, then the output will be

• 0
• 99999999
• 1
• unpredictable

Question 34

Consider the following C program

#include 
main()
{
float sum = 0.0, j =1.0, i = 2.0; 
while(i/j > 0.001) {
    j = j + 1;
    sum = sum + i/j;
    printf ( "%f\\n", sum );
    }
}

How many lines of output does this program produce?

• 0-9 lines of output
• 10-19 lines of output
• 20-29 lines of output
• More than 29 lines of output

Question 35

Given below are three implementations of the swap( ) function in C++: (a)

void swap (int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
int main( )
{
int p = 0, q = 1;
swap (p, q);
}

(b)

void swap (int &a, int &b)
{
int temp;
temp = a;
a = b;
b = temp;
}
int main( )
{
int p = 0, q = 1;
swap (p, q);
}

(c)

void swap (int * a, int * b)
{
int * temp;
temp = a;
a = b;
b = temp;
}
int main( )
{
int p = 0, q = 1;
swap (&p, &q);
}

Which of these would actually swap the contents of the two integer variables p and q?

• (a) only
• (b) only
• (c) only
• (b) and (c) only

Question 36

Consider a Boolean function of ‘n’ variables. The order of an algorithm that determines whether the Boolean function produces a output 1 is

• Logarithmic
• Linear
• Quadratic
• Exponential

Question 37

In C, parameters are always 

• Passed by value
  

• Passed by reference
  

• Non-pointer variables are passed by value and pointers are passed by reference
  

• Passed by value result
  

Question 38

Which of the following is true about return type of functions in C?

• Functions can return any type
  

• Functions can return any type except array and functions
  

• Functions can return any type except array, functions and union
  

• Functions can return any type except array, functions, function pointer and union
  

Question 39

Which one of the following is correct for overloaded functions in C++ ?

• Compiler sets up a separate function for every definition of function.
  

• Compiler does not set up a separate function for every definition of function. 
  

• Overloaded functions cannot handle different types of objects. 
  

• Overloaded functions cannot have same number of arguments. 
  

Question 40

Consider the following C-program :

C

int fun(){  static int num = 16;  return num--;}int main(){  for(fun(); fun(); fun())    printf(\"%d \", fun());  return 0;}

What is output of above program?

• Infinite loop
  

• 13 10 7 4 1
  

• 15 12 8 5 2
  

• 14 11 8 5 2