Which of the following function is used to find the first occurrence of a given

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

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1) What is the output of this C code?

#include <stdio.h>
     int main()
     {
         char *str = "hello, world";
         char *str1 = "hello, world";
         if (strcmp(str, str1))
             printf("equal");
         else
             printf("unequal");
     }

2) What will be the output of the program ?

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

3) 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");
 }

4) Which is more appropriate for reading in multi-word string?

5) What is the output of this C code?

#include <stdio.h>
     int main()
     {
         char str[11] = "hello";
         char *str1 = "world";
         strcat(str, str1);
         printf("%s %d", str, str[10]);
     }