Which of the following function is more appropriate for reading in a multi-word

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

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1) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     printf(2+"C Programming MCQ on Study 2 Online\n");
     return 0;
 }

2) Which of the following function sets first n characters of a string to a given character?

3) What is the output of this C code?

#include <stdio.h>
     int main()
     {
         char *str = "hello, world\n";
         printf("%d", strlen(str));
       }

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

5) What will be the output of the following program?

void main()
 {
       char str1[] = "abcd";
       char str2[] = "abcd";
       if(str1==str2)
             printf("Equal");
       else
             printf("Unequal");
 }