The expression UChar( c ) converts to unsigned char in order to get rid of negative values, which, except for EOF, are not supported by the C functions. Then the result of that expression is used as actual argument for an int formal argument. Where you get automatic promotion to int.
If you can't live with a const char* then you better copy the char array like
int search_book(){ int select_search; char dumpchar[30]
Think of the char data type as a small integer type. That’s exactly what it is. We just happen to typically store ASCII (or other) character codes in chars, but they are ultimately just small
Перевожу char в int, но на выходе неверное число, вот упрощений вариант
Читаем Serial и записываем в int [B]Получение целого однозначного числа(1..9)[/B] IntVar=(Serial.read() - '0')
...С const char* numbercsz(signed long long number) { char* result = new char[21], *index = result
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