[Original] C ++ determines whether the operating system is 16-bit or 32-bit

There are two solutions:

1. whether the operating system is 16-bit or 32-bit is related to its address addressing method (CPU support is required, but it is not necessarily related to the CPU length). Therefore, you can directly use the pointer (address) to judge:

Cout <(sizeof (int *) = 4? "32 bit": "16 bit") <Endl;

2. If sizeof is not allowed, it is determined by the range indicated by an integer. The maximum integer value in a 16-bit system is 65535:

Unsigned int A = ~ 0;
Cout <(A> 65535? "32 bit": "16 bit") <Endl;