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23 lines
538 B
C++
23 lines
538 B
C++
#include <iostream>
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#include <algorithm>
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#include <string>
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#include <string_view>
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#include <cctype>
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using std::cout, std::endl, std::string, std::string_view;
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bool isIdentifier(string_view sv) {
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bool is = true;
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if (!(std::isalpha(sv[0]) || sv[0] == '_'))
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return false;
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if (std::all_of(sv.begin(), sv.end(), [](const char c){ return isalpha(c) || isdigit(c) || c == '_' ;}))
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return true;
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return false;
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}
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int main() {
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string s;
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getline(std::cin, s);
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cout << isIdentifier(s) << endl;
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}
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