using namespace std;
int main(int argc, char *argv[])
{
char str1[] = "abc";
char str2[] = "abc";
const char str3[] = "abc";
const char str4[] = "abc";
const char* str5 = "abc";
const char* str6 = "abc";
cout << boolalpha << (str1 == str2) << endl;
cout << boolalpha << (str3 == str4) << endl;
cout << boolalpha << (str5 == str6) << endl;
return 0;
}
鍒嗗埆杈撳嚭false,false,true銆俿tr1鍜宻tr2閮芥槸瀛楃鏁扮粍錛屾瘡涓兘鏈夊叾鑷繁鐨勫瓨鍌ㄥ尯錛屽畠浠殑鍊煎垯鏄悇瀛樺偍鍖洪鍦板潃錛屼笉絳夛紱str3鍜? str4鍚屼笂錛屽彧鏄寜const璇箟錛屽畠浠墍鎸囧悜鐨勬暟鎹尯涓嶈兘淇敼銆俿tr5鍜宻tr6騫墮潪鏁扮粍鑰屾槸瀛楃鎸囬拡錛屽茍涓嶅垎閰嶅瓨鍌ㄥ尯錛屽叾鍚庣殑“abc”浠ュ父閲忓艦 寮忓瓨浜庨潤鎬佹暟鎹尯錛岃屽畠浠嚜宸變粎鏄寚鍚戣鍖洪鍦板潃鐨勬寚閽堬紝鐩哥瓑
boolalpha 鐢ㄧ鍙峰艦寮忚〃紺虹湡鍋囥?br>
#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
float a = 1.0f;
cout << (int)a << endl;
cout << (int&)a << endl;
cout << boolalpha << ( (int)a == (int&)a ) << endl; // 杈撳嚭浠涔堬紵
float b = 0.0f;
cout << (int)b << endl;
cout << (int&)b << endl;
cout << boolalpha << ( (int)b == (int&)b ) << endl; // 杈撳嚭浠涔堬紵
return 0;
}
using namespace std;
int main(int argc, char *argv[])
{
float a = 1.0f;
cout << (int)a << endl;
cout << (int&)a << endl;
cout << boolalpha << ( (int)a == (int&)a ) << endl; // 杈撳嚭浠涔堬紵
float b = 0.0f;
cout << (int)b << endl;
cout << (int&)b << endl;
cout << boolalpha << ( (int)b == (int&)b ) << endl; // 杈撳嚭浠涔堬紵
return 0;
}
...
cout < < boolalpha < < ( (int)a == (int&)a ) < < endl;
// 杈撳嚭 false, 鍥犱負(fù) float 鐨?1 鍜?int 鐨?1 鍦ㄥ唴瀛橀噷鐨勮〃紺轟笉涓鏍楓?
...
cout < < boolalpha < < ( (int)b == (int&)b ) < < endl; // 杈撳嚭 true
// 杈撳嚭 true, 鍥犱負(fù) float 鐨?0 鍜?int 鐨?0 鍦ㄥ唴瀛橀噷鐨勮〃紺烘槸涓鏍風(fēng)殑銆?
(int &)a 灝辮〃紺?涓嶇 a 鏄粈涔堬紝鎴戦兘褰撲粬鏄竴涓猧nt鍙橀噺銆?
浠庢満鍣ㄧ爜鐨勮搴︽潵璇達(dá)紝鍙橀噺a浼?xì)琚樆璇戞垚涓涓唴瀛樺湴鍧錛?int &)a 灝辨槸璇達(dá)紝榪欎釜鍐呭瓨鍦板潃閲岀殑鍐呭瀹冩槸涓涓暣鏁般?
(int)a 鍛笉鍚岋細(xì)濡傛灉 a 涓嶆槸鏁存暟錛屽氨浼?xì)鎸夎鍒欒浆鎹㈡垚鏁存晭图屽瓨鍏ュ彟涓涓湴鍧(鎴栦復(fù)鏃跺彉閲?涓幓銆?br>
嫻偣鏁扮殑 1.0f 鍦ㄥ唴瀛橀噷鏄繖鏍瘋〃紺虹殑錛?
0011 1111 1000 0000 00000000 00000000
榪欎釜32浣嶄簩榪涘埗鏁拌褰撲綔鏁存暟杈撳嚭灝辨槸錛?
1065353216
鑰屾暣鏁扮殑 1 鍦ㄥ唴瀛橀噷鏄繖鏍瘋〃紺虹殑錛?
0000 0000 0000 0000 00000000 00000001
鎵浠?(int)a != (int&)a
嫻偣鐨?鍜屾暣鏁扮殑0 鍦ㄥ唴瀛橀噷閮芥槸錛?
0000 0000 0000 0000 00000000 00000000
鎵浠?(int)b == (int&)b
]]>