placement c progrmming Question with Answer

1) 

void main()

         {

if(~0 == (unsigned int)-1)

printf(“You can answer this if you know how values are represented in memory”);

         }

 Answer:-

You can answer this if you know how values are represented in memory.

Explanation:-

~ (tilde operator or bit-wise negation operator) operates on 0 to produce all ones to fill the space for an integer. –1 is represented in unsigned value as all 1’s and so both are equal.

2) 

int swap(int *a,int *b)

{

 *a=*a+*b;*b=*a-*b;*a=*a-*b;

}

main()

{

int x=10,y=20;

swap(&x,&y);

printf("x= %d y = %d\n",x,y);

}

Answer

x = 20 y = 10

Explanation

This is one way of swapping two values. Simple checking will help understand this.

3)

main()

{

char *p = “ayqm”;

printf(“%c”,++*(p++));

}

Answer:

b  

4)

       main()

{

int i=5;

printf("%d",++i++);

} 

Answer:

Compiler error: Lvalue required in function main

Explanation:

++i yields an rvalue.  For postfix ++ to operate an lvalue is required.

5)

main()

{

char *p = “ayqm”;

char c;

c = ++*p++;

printf(“%c”,c);

}

Answer:

b

Explanation:

There is no difference between the expression ++*(p++) and ++*p++. Parenthesis just works as a visual clue for the reader to see which expression is first evaluated. 

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