数据结构--串

Common.h

#define OK 1
#define ERROR 0
#define OVERFLOW -2
#define NULL 0

typedef int Status;

String.h

#include "Common.h"

#define MAXSTRLEN 255
typedef char SString[MAXSTRLEN + 1];

Status Assign(SString T, char* chars);
int Index(SString S, SString T, int pos);

main.cpp

#include <iostream>
#include "String.h"
using namespace std;
int main()
{
	while (1)
	{
		cout << "请输入主串："; char s1[1024];cin.getline(s1, 1024);
		cout << "请输入子串："; char s2[1024];cin.getline(s2, 1024);
		if(strlen(s1)==0||strlen(s2)==0)
		{
			cout << "错误：主串和子串都不能是空串..." << endl << endl;
		}
		else
		{
			SString S; Assign(S, s1);
			SString T; Assign(T, s2);

			cout << "主串和子串在第"
				<< Index(S, T, 1) << "个字符处首次匹配\n\n";
		}
	}
	return 0;
}

String.cpp

#include "String.h"
#include <iostream>

Status Assign(SString T, char* chars)
{
	int i;
	if (strlen(chars) > MAXSTRLEN)return ERROR;
	else
	{
		T[0] = strlen(chars);
		for (i = 1;i <= T[0];i++) T[i] = *(chars + i - 1);
		return OK;
	}
}
int Index(SString S, SString T, int pos)
{
	int i = pos;int j = 1;
	while(i<=S[0]&&j<=T[0])
	{
		if (S[i] == T[j]) { ++i;++j; }
		else { i = i - j + 2;j = 1;}
	}
	if (j > T[0])return i - T[0];
	else return 0;
}