鍦–++涓紝澶栭儴鍙橀噺鍙互閫氳繃鍦ㄥ嚱鏁版垨绫讳箣澶栧０鏄庡拰瀹氫箟鏉ュ畾涔夈€傚彲浠ュ湪鍏ㄥ眬浣滅敤鍩熶腑瀹氫箟澶栭儴鍙橀噺锛屼篃鍙互鍦ㄥ懡鍚嶇┖闂翠腑瀹氫箟澶栭儴鍙橀噺銆?/p>

1. 鍦ㄥ叏灞€浣滅敤鍩熶腑瀹氫箟澶栭儴鍙橀噺锛?/li>

int globalVariable; // 鍦ㄥ叏灞€浣滅敤鍩熶腑瀹氫箟澶栭儴鍙橀噺

int main() {
    // 浣跨敤澶栭儴鍙橀噺globalVariable
    globalVariable = 10;
    return 0;
}

2. 鍦ㄥ懡鍚嶇┖闂翠腑瀹氫箟澶栭儴鍙橀噺锛?/li>

namespace MyNamespace {
    int externalVariable; // 鍦ㄥ懡鍚嶇┖闂翠腑瀹氫箟澶栭儴鍙橀噺
}

int main() {
    // 浣跨敤澶栭儴鍙橀噺MyNamespace::externalVariable
    MyNamespace::externalVariable = 20;
    return 0;
}

娉ㄦ剰锛屽湪浣跨敤澶栭儴鍙橀噺涔嬪墠锛岄渶瑕佸厛杩涜澹版槑锛屼互鍛婅瘔缂栬瘧鍣ㄨ鍙橀噺鐨勫瓨鍦ㄣ€備緥濡傦紝鍦ㄥ嚱鏁颁腑浣跨敤鍏ㄥ眬鍙橀噺鏃讹紝鍙互鍦ㄥ嚱鏁颁腑浣跨敤extern鍏抽敭瀛楁潵澹版槑璇ュ彉閲忥細

extern int globalVariable; // 澹版槑鍏ㄥ眬鍙橀噺

int main() {
    // 浣跨敤澶栭儴鍙橀噺globalVariable
    globalVariable = 10;
    return 0;
}

濡傛灉娌℃湁鎻愪緵澶栭儴鍙橀噺鐨勫畾涔夛紝鑰屽彧鏄繘琛屼簡澹版槑锛岀紪璇戝櫒灏嗕細鍦ㄩ摼鎺ラ樁娈垫煡鎵捐鍙橀噺鐨勫畾涔夈€?/p>