C Progrmming Language placement Question with Solution

1)

main()

{

extern i;

printf("%d\n",i);

{

int i=20;

printf("%d\n",i);

}

}

Answer:

Linker Error : Unresolved external symbol i

Explanation:

The identifier i is available in the inner block and so using extern has no use in resolving it. 

2)

main()

{

int a=2,*f1,*f2;

f1=f2=&a;

*f2+=*f2+=a+=2.5;

printf("\n%d %d %d",a,*f1,*f2);

}

Answer:

16 16 16

Explanation:

f1 and f2 both refer to the same memory location a. So changes through f1 and f2 ultimately affects only the value of a. 

3)

main()

{

char *p="GOOD";

char a[ ]="GOOD";

       printf("\n sizeof(p) = %d, sizeof(*p) = %d, strlen(p) = %d", sizeof(p), sizeof(*p),           strlen(p));

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

}

Answer:

sizeof(p) = 2, sizeof(*p) = 1, strlen(p) = 4

sizeof(a) = 5, strlen(a) = 4

Explanation:

sizeof(p) => sizeof(char*) => 2

sizeof(*p) => sizeof(char) => 1

Similarly,

sizeof(a) => size of the character array => 5

When sizeof operator is applied to an array it returns the sizeof the array and it is not the same as the sizeof the pointer variable. Here the sizeof(a) where a is the character array and the size of the array is 5 because the space necessary for the terminating NULL character should also be taken into account.

4)

#define DIM( array, type) sizeof(array)/sizeof(type)

main()

{

int arr[10];

printf(“The dimension of the array is %d”, DIM(arr, int));    

}

Answer:

10   

Explanation:

The size  of integer array of 10 elements is 10 * sizeof(int). The macro expands to sizeof(arr)/sizeof(int) => 10 * sizeof(int) / sizeof(int) => 10.

5)

int DIM(int array[ ]) 

{

return sizeof(array)/sizeof(int );

}

main()

{

int arr[10];

printf(“The dimension of the array is %d”, DIM(arr));    

}

Answer:

1   

Explanation:-

Arrays cannot be passed to functions as arguments and only the pointers can be passed. So the argument is equivalent to int * array (this is one of the very few places where [ ] and * usage are equivalent). The return statement becomes, sizeof(int *)/ sizeof(int) that happens to be equal in this case. 

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