Enhance your debugging skills!

1) hi
4) f
5) 2 21 (considering int to be 2 bytes long)

@Ram: Didn't you read what i have posted above the questions?

praveena211

@Ram: Didn't you read what i have posted above the questions?

Well, the question was what was the output. So, I just gave the output.. Anyway, here you go..

1.

#include<stdio.h>
#include<conio.h>
int main()
{
   char name[]="paradigm";
   fprintf(stdin,"hi");
   scanf("%s",name);
   printf("%s",name);
   getch();
   return 0;
}

OUTPUT : "hi"


4

#include<stdio.h>
main ()
{
char *table[] = {“jan”,”feb”,”march”};
char **ptr = &table [1];
printf (“%c”, (*++*--ptr));
}

OUTPUT : f


5

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
    int a=20;
    printf("%d,%d",sizeof(++a),++a);
    getch();
    return 0;
}

OUTPUT : 2 20

Hi Praveena,

Finally got time to solve these questions, so here are my answers 😀


1) I guess the use of fprintf is not required, since it is used for file operations and it takes the 1st parameter as a pointer to a file and then the 2nd parameter as string format. So I have commented the fprintf and now the program should output like following:

wait for the user input , once the user enter his name the value is overwriten the array named name (from paradigm to what ever name the user enters) and print the name.

#include<stdio.h>
#include<conio.h>
int main()
{        
   char name[]="paradigm";
  //fprintf(stdin,"hi");
   scanf("%s",name);
   printf("%s",name);
   getch();
   return 0;
}

2) The below querys will work fine

A) Select * from employees where salary>(select min(salary) from employees group by dept_id));
C) Select distinct dept_id from employees where salary> any (Select avg(salary) from employees group by dept_id)
D) Select dept_id from employees where salary>all(Select avg(salary) from employees group by dept_id));
E) select name from employees where salary>any(select max(salary) from employees group by dept_id));

The reason why,

B) Select * from employees where salary=(select avg(salary) from employees group by dept_id));

wont work is because the inner most query will return multiple result set and will throw an error.

The reason why,

F) Select dept_id from employees where salary>all(Select avg(salary) from employees group by avg(salary))

wont work is because we cannt use avg function in the group by clause.

NOTE:And also in query C and F, I guess you have forgotten the ; at the end of the query by mistake.


3) The output of the program will be 2 3 1 according to the code you have given the only prob is that there are two include files (#include<setjmp.h>). But the actual way I used setjmp is like follows and the program will output 1 2 3

#include<stdio.h>
#include <setjmp.h>
jmp_buf buf;
         
banana() {
printf("2 "); 
longjmp(buf, 1);
printf("4 "); 
}            
main()
{
int i;
i = setjmp(buf);
if (i==0)
{   
printf("1 ");
banana();
}   
else { 
printf("3 ");
}   
}

5) The program will output 4,21 since the sizeof operator will return the size of the variable a which is integer ( I am using linux gcc complier so the size of int is 4) and the value of a will be 21 as the increment operator in the size of will not work as size of operator is a complie time operator which just returns the size of the type and it does not require the value of a so increment will not take effect!! and the initial value of a (20) will be increment as you have used ++a and printed, as it is postfixing (since the value is increment and then used when you use postfixing)

So according to me the ++a in the sizeof operator should be replaced with a, as it is of no use even if you increment it within sizeof!!

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{         
    int a=20; 
    printf("%d,%d",sizeof(a),++a);
    getch();
    return 0;
} 

-Arvind