81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
/* 字典插入与查找.cpp */
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#include <cstring>
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#include <iostream>
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#include <map>
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using namespace std;
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int main(int argc, char const *argv[]) {
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map<const char *, const char *> mp;
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map<const char *, const char *>::iterator iter;
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const char key[3][20] = {"img", "system", "ip"};
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const char value[3][20] = {"d:/a.img", "win7", "193.68.6.3"};
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// make_pair插入
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for (int i = 0; i < 2; i++) {
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mp.insert(make_pair(key[i], value[i]));
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}
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// pair<const char*,const char*>插入
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mp.insert(pair<const char *, const char *>(key[2], value[2]));
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//数组插入方式
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mp["addr"] = "中国";
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//迭代器取出元素
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//循环取出元素
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for (iter = mp.begin(); iter != mp.end(); iter++) {
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cout << iter->first << "\t" << iter->second << endl;
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}
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char key1[20];
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cout << "请输入按key查找：";
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cin.getline(key1, 20);
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//查找元素
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for (iter = mp.begin(); iter != mp.end(); iter++) {
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if (strcmp(iter->first, key1) == 0) {
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cout << iter->first << "查找出来了！"
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<< "对应的值为：" << iter->second << endl;
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}
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}
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//第一种删除方式
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// find只能用于查找数组建立的形式！并且不支持输入用cin等
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iter = mp.find("addr");
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if (iter != mp.end()) {
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cout << iter->first << "按照key查找出来了！"
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<< "对应的value为：" << iter->second << endl;
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cout << "开始删除元素！" << endl;
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mp.erase(iter);
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// break;
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}
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//第二种方式删除
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//按照key删除元素
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char drop_key[20];
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//按照value删除元素
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char drop_value[20];
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cout << "请输入按key删除：";
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cin.getline(drop_key, 20);
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cout << "请输入按value删除：";
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cin.getline(drop_value, 20);
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for (iter = mp.begin(); iter != mp.end(); iter++) {
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if (strcmp(iter->first, drop_key) == 0) {
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cout << iter->first << "按照key查找出来了！"
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<< "对应的value为：" << iter->second << endl;
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cout << "开始删除元素！" << endl;
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mp.erase(iter);
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break;
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}
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if (strcmp(iter->second, drop_value) == 0) {
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cout << iter->second << "value查找出来了！"
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<< "对应的key为：" << iter->first << endl;
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cout << "开始删除元素！" << endl;
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mp.erase(iter);
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break;
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}
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}
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cout << "------删除元素以后--------\n";
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//循环取出元素
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for (iter = mp.begin(); iter != mp.end(); iter++) {
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cout << iter->first << "\t" << iter->second << endl;
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}
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return 0;
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}
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