改成c语言并且能在vs2022运行#include <iostream> #include <string> using namespace std; int patternMatch(string str, string pattern) { int n = str.size(); int m = pattern.size(); if (n < m) { return -1; // 如果文本串长度小于模式串，匹配失败 } for (int i = 0; i <= n - m; i++) { bool isMatched = true; for (int j = 0; j < m; j++) { if (str[i + j] != pattern[j]) { isMatched = false; break; } } if (isMatched) { return i; // 返回匹配成功的起始位置 } } return -1; // 匹配失败 } int main() { string str = "hello world"; string pattern = "world"; int pos = patternMatch(str, pattern); if (pos != -1) { cout << "匹配成功，起始位置为：" << pos << endl; } else { cout << "匹配失败！" << endl; } return 0; }

以下是改成C语言并且能在VS2022运行的代码：

#include <stdio.h>
#include <string.h>

int patternMatch(char* str, char* pattern) {
    int n = strlen(str);
    int m = strlen(pattern);
    if (n < m) {
        return -1; // 如果文本串长度小于模式串，匹配失败
    }
    for (int i = 0; i <= n - m; i++) {
        int isMatched = 1;
        for (int j = 0; j < m; j++) {
            if (str[i + j] != pattern[j]) {
                isMatched = 0;
                break;
            }
        }
        if (isMatched) {
            return i; // 返回匹配成功的起始位置
        }
    }
    return -1; // 匹配失败
}

int main() {
    char str[] = "hello world";
    char pattern[] = "world";
    int pos = patternMatch(str, pattern);
    if (pos != -1) {
        printf("匹配成功，起始位置为：%d\n", pos);
    } else {
        printf("匹配失败！\n");
    }
    return 0;
}