11.
Determine Output:
void main()
{
      char string[]="Hello World";
      display(string);
}
void display(char *string)
{
      printf("%s", string);
}

12.
Determine Output:
void main()
{
      int i=5;
      printf("%d%d%d%d%d", i++, i--, ++i, --i, i);
}

13.
Determine Output:
#define square(x) x*x
void main()
{
      int i;
      i = 64/square(4);
      printf("%d", i);
}

14.
Determine Output:
void main()
{
      char *p="hi friends", *p1;
      p1=p;
      while(*p!='\0') ++*p++;
      printf("%s", p1);
}

15.
Determine Output:
#include<stdio.h>
#define a 10
void main()
{
      #define a 50
      printf("%d", a);
}