C++ - 实现strcmp函数

#include <iostream>

#define NULL 0

using namespace std;

int myStrcmp(const char* s1, const char* s2)
{
	while(*s1 && *s2 && *s1 == *s2)
	{
		++s1;
		++s2;
	}
	return *s1 - *s2;
}

int main()
{
	char s1[10] = "456456789";
	char s2[4] = "456";
	cout << myStrcmp(s1, s2) << endl;
	return 0;
}

// Output:
/*
52
*/