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GATE | GATE-IT-2004 | Question 60

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  • Last Updated : 28 Jun, 2021

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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