Some C Program

1. How would you round off a value 1.66 to 2.00 and truncate1.75 to 1.00 using C program?

#include<stdio.h>
#include<math.h>
void main()
{
    float x=1.66;
    float y=1.75;
    printf(" %f  %f",ceil(x),floor(y));
}



2. What is the storage class of i in the following statement?
int i;
ans: The storage class of i is auto if it is declared within the main() and extern if it is declared outside main().

3. Which of the following is not a logical operator?
      a) & ,   b) &&,    c) ||,    d) !
ans: option a

4. What will be output of the following program?
#include<stdio.h>
void main()
{
  int i=3;
  i=i++;
  printf("%d",i);
}

ans: 4

5. What will be output of the following program?

#include<stdio.h>
void main()
{
  int x=4,y,z;
  y=--x;
  z=x--;
  printf("%d %d %d",x,y,z);
}

ans:  2  3  3

6. We want to round off x, a float, to an int value. The correct way to do so will be?
    a)     y=(int)(x+0.5);
    b)     y=int(x+0.5);
    c)     y=(int)x+0.5;
    d)     y=(int)((int)x+0.5);


ans: option (a)

7. Is it true that too many recursive calls may result into stack overflow?

ans: yes

8. If the size of int is 4 byte , then what will be the output of the program?
#include<stdio.h>
void main()
{
   int arr[]={12,13,14,15,16};
   printf("%d  %d  %d",sizeof(arr), sizeof(*arr),sizeof(arr[0]));
 }

ans:  20  4  4

9. What will be output of the following program?
#include<stdio.h>
void main()
{
  char *str;
   str="%d \n";
   str++;
   str++;
   printf(str -2,300);
}

ans: 300

10. What will be output of the following program?
#include<stdio.h>
void main()
{
   int i,*j,k;
   i=3;
   j=&i;
   printf("%d",i**j*i+*j);
}

ans:30