placement Question and answer in Simple C Language

1)

In the following pgm add a  stmt in the function  fun such that the address of 

'a' gets stored in 'j'.

main()

{

  int * j;

  void fun(int **);

  fun(&j);

 }

 void fun(int **k) {

  int a =0;

  /* add a stmt here*/

 }

Answer:

*k = &a

Explanation:

       The argument of the function is a pointer to a pointer.

      

2)

What are the following notations of defining functions known as?

i.      int abc(int a,float b)

         {

                 /* some code */

 }

ii.    int abc(a,b)

        int a; float b;

         {

           /* some code*/

         }

Answer:

i.  ANSI C notation

ii. Kernighan & Ritche notation 

3)

main()

{

char *p;

p="%d\n";

           p++;

           p++;

           printf(p-2,300);

}

Answer:

300

Explanation:

The pointer points to % since it is incremented twice and again decremented by 2, it points to '%d\n' and 300 is printed.

4)

main()

{

 char a[100];

 a[0]='a';a[1]]='b';a[2]='c';a[4]='d';

 abc(a);

}

abc(char a[ ]){

 a++; 

   printf("%c",*a);

 a++;

 printf("%c",*a);

}

Explanation:

The base address is modified only in function and as a result a points to 'b' then after incrementing to 'c' so bc will be printed.

                

5)

func(a,b)

int a,b;

{

 return( a= (a==b) );

}

main()

{

int process(),func();

printf("The value of process is %d !\n ",process(func,3,6));

}

process(pf,val1,val2)

int (*pf) ();

int val1,val2;

{

return((*pf) (val1,val2));

 }

Answer:-

The value if process is 0 !

Explanation:

The function 'process' has 3 parameters - 1, a pointer to another function  2 and 3, integers. When this function is invoked from main, the following substitutions for formal parameters take place: func for pf, 3 for val1 and 6 for val2. This function returns the result of the operation performed by the function 'func'. The function func has two integer parameters. The formal parameters are substituted as 3 for a and 6 for b. since 3 is not equal to 6, a==b returns 0. therefore the function returns 0 which in turn is returned by the function 'process'.

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