How do I fix the 'expected ';' before string constant' error while running a C++ program in Windows using GCC compiler?

I'm trying to run a C++ program in Windows (using the gcc compiler).On the six line of code below:

char a[1];
cout << "Vui long nhap mot chu cai:";
cin >>a;
if(strupr(a)) {
    strlwr (a);
    cout "Chu cai cua ban sau khi in thuong la:" << strlwr(a) << endl;
    return 0;
}


return 0;

error: expected ';' before string constant

#include #include <string.h>

I DONT Know Pls help me