回答編集履歴
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追記
test
CHANGED
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@@ -51,3 +51,49 @@
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}
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```
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[追記] <cctype> 使えとの思し召しなら:
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```C++
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#include <iostream>
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#include <string>
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#include <algorithm>
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#include <cctype>
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std::string change(const std::string& str) {
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std::string result(str.size(),'\0');
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std::transform(str.begin(), str.end(), result.begin(),
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[](char ch) { return isupper(ch) ? tolower(ch) :
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(islower(ch) ? toupper(ch) : ch); });
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return result;
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}
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int main() {
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std::string line;
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while ( std::getline(std::cin, line) && line.size() != 0 ) {
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std::cout << '[' << line << "] -> [" << change(line) << "]\n";
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}
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}
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```
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