21.
If the two strings are identical, then strcmp() function returns

22.
The library function used to find the last occurrence of a character in a string is

23.
Which of the following function is used to find the first occurrence of a given string in another string?

24.
Which of the following function is more appropriate for reading in a multi-word string?

25.
What will be the output of the program ?
#include<stdio.h>
#include<string.h>
void main()
{
    char str1[20] = "Hello", str2[20] = " World";
    printf("%s", strcpy(str2, strcat(str1, str2)));
}