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

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

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1) What will be the output of the program ?

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

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

3) What is the output of this C code?

#include <stdio.h>
     int main()
     {
         char *str = "hello";
         char str1[5];
         strcpy(str, str1);
         printf("%s", str1);
     }

4) How will you print \n on the screen?

5) What is the output of this C code?

#include <stdio.h>
     #include <string.h>
     int main()
     {
         char *str = "hello, world";
         char str1[9];
         strncpy(str1, str, 9);
         printf("%s %d", str1, strlen(str1));
     }