getchar_unlocked in windows undeclared

Question

Here is my code:

#include 

void scan(int* i)
{
    int t=0;
    char c;
    bool negative=false;
    c=getchar_unlocked();
    while(c<\'0         


        

Answer 1

getchar_unlocked is not a C or C++ standard function and therefore it's no surprise that it doesn't work on Windows. It is a POSIX standard I think, but Windows compilers don't support all POSIX functions.

If you replaced getchar_unlocked with getchar, it would kind of work, although the algorithm doesn't seem quite right.

You could do this with conditional compilation, like this for instance

#ifdef _WINDOWS
// no getchar_unlocked on Windows so just call getchar
inline int getchar_unlocked() { return getchar(); }
#endif