Stuck on first lesson

I am on the first lesson at learn C .org . And I am stuck already! I cannot see why one of these code will run and the other gives an error.

#incude <stdio.h>

int main() {
printf(“Mixfish”);
return 0;
}

#include <stdio.h>

int main() {
printf(“Mixfish”);
return 0;
}

prog.cpp:4:19: error: ‘printf’ was not declared in this scope
printf(“Mixfish”);
^
#incude <stdio.h>

int main() {
printf(“Mixfish”);
return 0;
}

#include <stdio.h>

int main() {
printf(“Mixfish”);
return 0;
}