C Aptitude Questions with Answers Part 25

1)

int aaa() {printf(“Hi”);} 
int bbb(){printf(“hello”);} 
iny ccc(){printf(“bye”);} 
 
main() {
   int ( * ptr[3]) (); 
   ptr[0] = aaa; 
   ptr[1] = bbb; 
   ptr[2] =ccc; 
   ptr[2](); 
} 

Answer:
bye
Explanation:
int (* ptr[3])() says that ptr is an array of pointers to functions that takes no arguments and returns the type int. By the assignment ptr[0] = aaa; it means that the first function pointer in the array is initialized with the address of the function aaa. Similarly, the other two array elements also get initialized with the addresses of the functions bbb and ccc. Since ptr[2] contains the address of the function ccc, the call to the function ptr[2]() is same as calling ccc(). So it results in printing "bye".

2)

main() {
   int i=5; 
   printf(“%d”,i=++i ==6); 
} 

Answer: 
1
Explanation:
The expression can be treated as i = (++i==6), because == is of higher precedence than = operator. In the inner expression, ++i is equal to 6 yielding true(1). Hence the result.

3)

main() {
   char p[ ]="%d\n"; 
   p[1] = 'c'; 
   printf(p,65); 
} 

Answer:
A
Explanation:
Due to the assignment p[1] = ‘c’ the string becomes, “%c\n”. Since this string becomes the format string for printf and ASCII value of 65 is ‘A’, the same gets printed.

4)

void ( * abc( int, void ( *def) () ) ) (); 

Answer:
 abc is a ptr to a function which takes 2 parameters .(a). an integer variable.(b). a ptrto a funtion which returns void. the return type of the function is void. 
Explanation:
Apply the clock-wise rule to find the result.


5)

main() {
  while (strcmp(“some”,”some\0”))  
    printf(“Strings are not equal\n”); 
} 

Answer:
No output
Explanation:
Ending the string constant with \0 explicitly makes no difference. So “some” and “some\0” are equivalent. So, strcmp returns 0 (false) hence breaking out of the while loop.