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C++ : Check weather entered string is in uppercase or lowercase or digit

 #include<iostream>

using namespace std;
int main()
{
    char str;
    cout<<"Enter String \n";
    cin>>str;
    if(str>=48 && str<=57)
        cout<<"Entered String is Digit \n";
    else if(str>=65 && str<=90)
        cout<<"Entered String is in Uppercase \n";
    else if(str>=97 && str<=122)
        cout<<"Entered String is in lowercase \n";    
    else
        cout<<"Wrong string entered";
}
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