C Programming - Online Quiz

Answer : A

Explanation

A, the range of ASCII values for the ASCII characters is 0-255. Hence the addition operation circulates back to ‘A’

Q 2 - What is the output of the following program?

#include<stdio.h>

main()
{  
   float t = 2;

   switch(t)
   {
       case 2: printf("Hi");
       default: printf("Hello");
   }
}

Answer : D

Explanation

Error, switch expression can’t be float value.

Q 3 - Identify the C compiler of UNIX.

Answer : B

Explanation

‘cc’ full form is C Compiler and is the compiler for UNIX. gcc is GNU C compiler for linux. Borland and vc++ (Microsoft visual c++) for windows.

Q 4 - What is the output of the following program?

#include<stdio.h>

int x = 5;
int* f() 
{
   return &x;
}
main()
{	
   *f() = 10;
   
   printf("%d", x);
}

Answer : D

Explanation

The returned address is global variables and 10 being stored in it. Therefore x is 10.

Q 5 - What is the output of the following program?

#include<stdio.h>

main()
{ 
   int x = 3;
   
   x += 2;
   x =+ 2;
   printf("%d", x); 
}

Answer : A

Explanation

+ in unary form is dummy operator, therefore ‘x’ is overwritten with the value +2 finally.

Q 6 - In normalized form, if the binary equivalent of 5.375 is “0100 0000 1010 1100 0000 0000 0000 0000” then what will be the output of the program in Intel core machine?

#include<stdio.h>
#include<math.h>

int main ()
{
   float a = 5.375;
   char *p;
   int i;
   
   p = (char*)&a;
   for(i=0; i <= 3; i++)
      printf("%02x\n", (unsigned char)p[i]);
   return 0;
}

Answer : B

Explanation

Depends upon the machine whether its big endian or small endian machine. Byte by byte is fetched from right end.

#include<stdio.h>
#include<math.h>

int main ()
{
   float a = 5.375;
   char *p;
   int i;
   
   p = (char*)&a;
   for(i=0; i <= 3; i++)
      printf("%02x\n", (unsigned char)p[i]);
   return 0;
}

Q 7 - Which of the following operator can be used to access value at address stored in a pointer variable?