Oops, forgot to add that! It is in C++. For C, here is the equivalent:

#include<stdio.h>

int main()
{
    printf("\033[1;34mHello World!\033[0m\n");
    return 0;
}

cout function
C++ only -- include the 'iostream' library

printf() function
C or C++ -- include the 'stdio.h' library