c program static_assert() char bit=16-CodePudding

What is CHAR_BIT==16 means in this code? It doesn't compile, I can not figure out the reason and what will be in puts so code will compile?

    #include <stdio.h>
    #include <stdlib.h>
    #include <assert.h>
    static_assert(CHAR_BIT==16,"16 bit falsely assumed");
    int main()
    {
        puts("hello world this");
        return 0;
    }

CodePudding user response：

CHAR_BIT is a Macro defined in limits.h. It mentions the number of bits in a char. Most systems use 8 bits, but there are architectures with less (7 bits) or more.

In your code, the assert is checking, if the system is using 16 bits for a char, then only the code will compile.

Note: Based on your compiler version and support, you may need to use _Static_assert instead.

CodePudding user response：

CHAR_BIT is defined in <limits.h>. You need to include it for your code to compile.