C Storage Classes and Type Qualifiers

Question 11

Output of following program

C

#include <stdio.h>
int fun(int n)
{
    static int s = 0;
    s = s + n;
    return (s);
}

int main()
{
    int i = 10, x;
    while (i > 0)
    {
        x = fun(i);
        i--;
    }
    printf (\"%d \", x);
    return 0;
}

• 0
• 100
• 110
• 55

Question 12

Output? (GATE CS 2012)

C

#include <stdio.h>
int a, b, c = 0;
void prtFun (void);
int main ()
{
    static int a = 1; /* line 1 */
    prtFun();
    a += 1;
    prtFun();
    printf ( \"\\n %d %d \" , a, b) ;
}
 
void prtFun (void)
{
    static int a = 2; /* line 2 */
    int b = 1;
    a += ++b;
    printf (\" \\n %d %d \" , a, b);
}

• 3 1
  4 1
  4 2
  
• 4 2
  6 1
  6 1
  
• 4 2
  6 2
  2 0
  
• 3 1
  5 2
  5 2
  

Question 13

Output?

C

#include <stdio.h>
int main()
{
  register int i = 10;
  int *ptr = &i;
  printf(\"%d\", *ptr);
  return 0;
}

• Prints 10 on all compilers
• May generate compiler Error
• Prints 0 on all compilers
• May generate runtime Error

Question 14

C

#include <stdio.h>
int main()
{
  extern int i;
  printf(\"%d \", i);
  {
       int i = 10;
       printf(\"%d \", i);
  }
}

• 0 10
• Compiler Error
• 0 0
• 10 10

Question 15

Output?

C

#include <stdio.h>

int main(void)
{
    int i = 10;
    const int *ptr = &i;
    *ptr = 100;
    printf(\"i = %d\\n\", i);
    return 0;
}

• i = 100
• i = 10
• Compiler Error
• Runtime Error

Question 16

C

#include <stdio.h>
char *fun()
{
    static char arr[1024];
    return arr;
}

int main()
{
    char *str = \"geeksforgeeks\";
    strcpy(fun(), str);
    str = fun();
    strcpy(str, \"geeksquiz\");
    printf(\"%s\", fun());
    return 0;
}

• geeksforgeeks
• geeksquiz
• geeksforgeeks geeksquiz
• Compiler Error

Question 17

Consider the following C function, what is the output?

C

#include <stdio.h>
int f(int n)
{
    static int r = 0;
    if (n <= 0) return 1;
    if (n > 3)
    {
        r = n;
        return f(n-2)+2;
    }
    return f(n-1)+r;
}

int main()
{
    printf(\"%d\", f(5));
}

• 5
• 7
• 9
• 18

Question 18

In the context of C data types, which of the followings is correct?

• “unsigned long long int” is a valid data type.
• “long long double” is a valid data type.
• “unsigned long double” is a valid data type.
• A), B) and C) all are valid data types.
• A), B) and C) all are invalid data types.

Question 19

For the following “typedef” in C, pick the best statement

C

typedef int INT, *INTPTR, ONEDARR[10], TWODARR[10][10];

• It will cause compile error because typedef is being used to define multiple aliases of incompatible types in the same statement.
• “INT x” would define x of type int. Remaining part of the statement would be ignored.
• “INT x” would define x of type int and “INTPTR y” would define pointer y of type int *. Remaining part of the statement would be ignored.
• “INT x” would define x of type int. “INTPTR y” would define pointer y of type int *. ONEDARR is an array of 10 int. TWODARR is a 2D array of 10 by 10 int.
• “INT x” would define x of type int. “INTPTR *y” would define pointer y of type int **. “ONEDARR z” would define z as array of 10 int. “TWODARR t” would define t as array of 10 by 10 int.

Question 20

Which of the followings is correct for a function definition along with storage-class specifier in C language?

• int fun(auto int arg)
• int fun(static int arg)
• int fun(register int arg)
• int fun(extern int arg)
• All of the above are correct.