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1. 纭繚杈撳叆鐨勫瓧绗︽槸鏈夋晥鐨凙SCII瀛楃锛屽嵆鍦?鍒?27涔嬮棿銆傚鏋滆緭鍏ュ瓧绗︿笉鍦ㄨ繖涓寖鍥村唴锛?code>tolower鍑芥暟鍙兘浼氳繑鍥炰笉鍙娴嬬殑缁撴灉銆?/p>

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浠ヤ笅鏄竴涓鐞嗚竟鐣屾儏鍐电殑绀轰緥浠ｇ爜锛?/p>

#include <iostream>
#include <cctype>

int main() {
    char c = 'A';

    if(isalpha(c)) {
        c = tolower(c);
        std::cout << "杞崲鍚庣殑瀛楃涓猴細" << c << std::endl;
    } else {
        std::cout << "杈撳叆瀛楃涓嶆槸瀛楁瘝锛?quot; << std::endl;
    }

    return 0;
}

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