Explained int main() (#32051)

Return value of main function explained

guide/english/c/hello-world/index.md

@@ -25,7 +25,7 @@ To write on console you can use the function `printf()` contained in the library
  * The `#include <stdio.h>` is a preprocessor directive. This directive tells preprocessor to include the contents of `stdio.h` (standard input and output) file in this file.
  * The `stdio.h` file contains functions such as `scanf()` and `printf()` to take input and display output respectively.
  * If you use `printf()` function without writing `#include <stdio.h>`, the compiler will generate an error during compliation of the program.
- * The execution of a C program starts from the `main()` function.
+ * The execution of a C program starts from the `main()` function. We write `int` before it to specify that the program returns a integer value.
  * The `printf()` is a library function to send formatted output to the standard output stream, most commoly the screen. In this program, the `printf()` displays `Hello, World!` text on the screen.
  * `\n` is used here to take the cursor to the next line. Hence, if we print anything after this command, it will be printed on a new line.
  * The `return 0;` statement is the "Exit code" of the program. In simple terms, program ends with this statement