📄 6_55.cpp
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#include <iostream>
#include <cctype>
using namespace std;
int main()
{ char str[80] = "This Is A Test";
cout << "Original string: " << str << "\n";
for(int i = 0; str[i]; i++)
{ if(isupper(str[i])) str[i] = tolower(str[i]); //将大写字母转换为小写
else if(islower(str[i])) str[i] = toupper(str[i]); //将小写字母转换为大写
}
cout << "Inverted-case string: " << str;
return 0;
}
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