Check lowercase letters c++

String c++ if letter is lowercase

for(int i=0;i<str.size();i++){
int c = str[i]; 
        if (islower(c))  
            str[i] = toupper(c);
}

str[i] = tolower(str[i]);

char character = 'a'; //0110 0001
if(character & 0x20) {
	//is lowercase
}

-1

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