C aptitude

 

1)

 main()

{

 printf("%x",-1<<4);

}

output:fff0

Explanation:-16 <- -8 <- -4 <- -2 <- -1

 

2)

main()

{

  printf("\nab");

  printf("\bsi");

  printf("\rha");

} 

output:hai

Explanation:

\n  - moves character to next line (ab_)

\b  - backspaces character (asi_)

\r  - moves cursor to extreme right (hai)

-   - cursor

3)

main()

{

   printf("%p",main);

}

output:some address is printed

Explanation:%p-prints the address 

4)

#define a 10

main()

{

   #define a 50

   printf("%d",a);

}

output:50

Explanation:preprocessor derictives can be redefined.

5)

main()

{

   show();

}

void show()

{

   printf("I'm the greatest");

}

output:compile error-type mismatch

Explanation:Default return type for functions is "int"