What is the output of the following code? 12345678#include <stdio.h> #include <string.h> int main() { char str[] = "Exploration of Mars"; char sub[] = "Mars"; printf("%s", strstr(str, sub)); return 0; }

The output of the code will be "Mars".

Here's the step by step explanation:

1. The code includes the standard input/output library stdio.h and the string library string.h in C programming language.

2. The main() function is declared, which is the entry point of the program.

3. Inside the main() function, a character array str[] is declared and initialized with the string "Exploration of Mars".

4. Another character array sub[] is declared and initialized with the string "Mars".

5. The printf() function is used to print the output of the strstr() function. The strstr() function is a built-in function in C which returns a pointer to the first occurrence of the substring sub in the string str. If the substring is not found, it returns a null pointer.

6. In this case, the strstr() function finds the substring "Mars" in the string "Exploration of Mars" and returns a pointer to the start of this substring.

7. The printf() function then prints the string starting from this pointer, which is "Mars".

8. The main() function returns 0, indicating successful execution of the program.