Fuctions

1. What is the output of the following code? Justify your answer.

#include<stdio.h>

int add(int x, int y)

{

        return (x+y);

}

int subtract(int x, int y)

{

        return(x-y);

}

int multiply(int x, int y)

{

        return(x*y);

}

int main()

{

        int (*fnarry[3])(int,int)={add,subtract,multiply};

        int i=0;

        printf("\n%d\n",(fnarry[i+1]+1)(5,6));

}

2. Impliment recursively xpowery i.e power(x,y).

3. Give anew method which performs same as below methods.

   Method 1:  if(x == 0)         Method 2: switch(x) {

                   fn0();                case 0: fn0();

             else if(x = 1)                   break;

                   fn1();             case 1: fn1();  

             else if(x = 2)                         break;

                   fn2();              case 2: fn2();

             else fnX();                        break;

                                       default: fnX();

                                     }

4. void fun(int p)

      {    

      p=p+1;

      return;

      }

      int main()

      {

      int p = 012

      fun(p);

      printf("%d\n",p);

      }

5. extern int add(int,int);

      extern int i;

      int main()

      {    

      printf("%d",add(100,200));

      }

      int add(int a, int b)

      {

      int i;

      i=a+b;

      return(i);

      }

6. What is size of following..

      int *a[10];

      int (*fun)();

      void *fun();

7. file1:

      int a[10];

      fun(int a[],int size)

      {

            printf("%d\n", sizeof(a));

       

file2:

      extern int a[];

      extern fun(int [],int);

       

      int main

      {

            fun(a, sizeof(a));

      }

8. #include       <stdio.h>    

      main ()

      {

      add(95,54);

      }

      void add(int a, int b)

      {

      int c;

      c = a+b;

      printf("%d\n", c);

      }

is there any problem with code?if YES.what is it?how do u fix it?

9. #include  <stdio.h>

int main()

 {

      int i = 012;

      fun(i);

      printf("%d\n", i);

 }

fun(int i)

 {

      i += 1;

 }

10. struct exp{

      int a;

      int b;      

      int c;

}

int fun(struct exp *s1)

{

      printf("%d",s1->a);

      printf("%d",s1->b);

      printf("%d",(*s1).c);

}

11. int main()

      {

      struct exp s1;

      s1.a=10;

      s1.b=20;

      s1.c=30;

      fun(&s1);

      }

1. What is Call by value and Call by reference?Explain with an example.

2. What is function?advantage of function over macro.

3. How variable argument lists works in c? Explain with an example

4. What happens if a variable is static within the recursion ?

5. recursive function to find the factorail of a number.

6. What is call back fuction & reentrant code?

7. How to pass entire array to a function as call by value ?

8. How stack frames are created when function is invoked?

9. Explain

int * (*fun)(int (*a)[])

10. What is inline function, how the compiler will recognizes whether it is inline or not, what is the

difference between inline and a normal function

11. What are the advantages of the functions?

12. What is the purpose of main( ) function?

13. What is an argument ? differentiate between formal arguments and actual arguments?

14. What is a function and built-in function?

15. What is modular programming?

16. What is a static function?

17. Why should I prototype a function?

18. When would you use a pointer to a function?

19.      How do you use a pointer to a function?

20.      Explain Stack winding.