p="%d\n";

    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

Blog Author: Vijay Kumar

Go to: Java Aptitude

for(i=1;i>-2;i--)

    main(){

 unsigned int i;

 for(i=1;i>-2;i--)

             printf("c aptitude");

}

Explanation:

i is an unsigned integer. It is compared with a signed value. Since the both types doesn't match, signed is promoted to unsigned value. The unsigned equivalent of -2 is a huge value so condition becomes false and control comes out of the loop.

Blog Author: Vijay Kumar

Go to: Java Aptitude

if(a,b,x,y)

    main(){

  int a= 0;int b = 20;char x =1;char y =10;

  if(a,b,x,y)

        printf("hello");

 }

Answer:

hello

Explanation:

The comma operator has associativity from left to right. Only the rightmost value is returned and the other values are evaluated and ignored. Thus the value of last variable y is returned to check in if. Since it is a non zero value if becomes true so, "hello" will be printed.

Blog Author: Vijay Kumar

Go to: Java Aptitude

i = abc();

main()

{

 int i;

 i = abc();

 printf("%d",i);

}

abc()

{

 _AX = 1000;

}

Answer:

1000

Explanation:

Normally the return value from the function is through the information from the accumulator. Here _AH is the pseudo global variable denoting the accumulator. Hence, the value of the accumulator is set 1000 so the function returns value 1000.

Blog Author: Vijay Kumar

Go to: Java Aptitude

if(i && j++)

main()

{

 int i =0;j=0;

 if(i && j++)

   printf("%d..%d",i++,j);

printf("%d..%d,i,j);

}

Answer:

0..0

Explanation:

The value of i is 0 i.e. false for if. Since this information is enough to determine the truth value of the boolean expression. So the statement following the if statement is not executed.  The values of i and j remain unchanged and get printed.

Blog Author: Vijay Kumar

Go to: Java Aptitude