Why do C and C++ compilers allow array lengths in function signatures when they're never enforced?

Question

This is what I found during my learning period:

#include
using namespace std;
int dis(char a[1])
{
    int length = strlen(a);
    char c = a         


        

Answer 1

It's allowed for compilers to be able to check whether the size of array passed is the same as what expected. Compilers may warn an issue if it's not the case.