43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
#include <iostream>
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#include <map>
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#include <string>
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using namespace std;
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// Add a number, name pair to the phonebook using a map.
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void add(map<int, string>& phonebook, int number, const string &name) {
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map<int, string>::iterator it = phonebook.find(number);
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if (it != phonebook.end()) {
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it->second = name;
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} else {
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phonebook.insert(pair<int, string>(number, name));
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}
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}
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// Given a phone number, determine who is calling.
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void identify(const map<int, string>& phonebook, int number) {
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map<int, string>::const_iterator it = phonebook.find(number);
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if (it == phonebook.end())
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cout << "unknown caller!" << endl;
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else
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cout << it->second << " is calling!" << endl;
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}
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int main() {
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// Init
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map<int, string> phonebook;
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// Add
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add(phonebook, 1111, "fred");
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add(phonebook, 2222, "sally");
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add(phonebook, 3333, "george");
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add(phonebook, 1234567, "alice");
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add(phonebook, 7654321, "bob");
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// Test
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identify(phonebook, 2222);
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identify(phonebook, 4444);
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identify(phonebook, 1234567);
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return 0;
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}
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