#include
#include
using namespace std;
int main()
{
string s1("hello"), s2("hello"), s3("hell");
int f1 = s1.compare(s2);
int f2 = s1.compare(s3);
int f3 = s3.compare(s1);
int f4 = s1.compare(1, 2, s3, 0, 3); //s1 1-2; s3 0-3
int f5 = s1.compare(0, s1.size(), s3); //s1 0-endstring类 2
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