C PROGRAMMING language PROBLEM with ANSWERS

1)

void main()

{

char ch;

for(ch=0;ch<=127;ch++)

printf(“%c   %d \n“, ch, ch);

}

Answer: 

Implementaion dependent

Explanation:

The char type may be signed or unsigned by default. If it is signed then ch++ is executed after ch reaches 127 and rotates back to -128. Thus ch is always smaller than 127.

2)

         Is this code legal?

         int *ptr; 

           ptr = (int *) 0x400; 

Answer: 

Yes

Explanation:

The pointer ptr will point at the integer in the memory location 0x400. 

3)

 main()

{

char a[4]="HELLO";

printf("%s",a);

}

Answer: 

Compiler error: Too many initializers

Explanation:

The array a is of size 4 but the string constant requires 6 bytes to get stored.

4)

main()

{

char a[4]="HELL";

printf("%s",a);

}

Answer: 

HELL%@!~@!@???@~~!

Explanation:

The character array has the memory just enough to hold the string “HELL” and doesnt have enough space to store the terminating null character. So it prints the HELL correctly and continues to print garbage values till it accidentally comes across a NULL character.

5)

      main()

     { 

int a=10,*j;

void *k; 

j=k=&a;

   j++;  

k++;

   printf("\n %u %u ",j,k);

      } 

Answer: 

Compiler error: Cannot increment a void pointer

Explanation:

Void pointers are generic pointers and they can be used only when the type is not known and as an intermediate address storage type. No pointer arithmetic can be done on it and you cannot apply indirection operator (*) on void pointers.

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