GATE | GATE-IT-2004 | Question 60

Choose the correct option to fill the ?1 and ?2 so that the program prints an input string in reverse order. Assume that the input string is terminated by a new line character.

#include <stdio.h>
void wrt_it (void);
int main (void)
{
    printf("Enter Text"); 
    printf ("\n");
    wrt_ it();
    printf ("\n");
    return 0;
}
void wrt_it (void)
{
    int c;
    if (?1)
        wrt_it();
    ?2
}

(A) ?1 is  getchar() ! = ‘\n’
?2 is  getchar(c);
(B) ?1 is  (c = getchar()); ! = ‘\n’
?2 is  getchar(c);
(C) ?1 is  c! = ‘\n’
?2 is  putchar(c);
(D) ?1 is (c = getchar()) ! = ‘\n’
?2 is putchar(c);


Answer: (D)

Explanation:
getchar() : This function is used to read a character from the standard input stream.

https://en.wikibooks.org/wiki/C_Programming/C_Reference/stdio.h/getchar

putchar() : This function is used to write a character to the standard output stream.

https://en.wikibooks.org/wiki/C_Programming/C_Reference/stdio.h/putchar


Thus, option (D) is correct.


Please comment below if you find anything wrong in the above post.

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