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网站建设完成后交付方式,手机app注册免费下载,弹幕网站开发,中国最新新闻大事件3.15 引用类型 C中值传递实现的是值得单向传递#xff0c;而引用传递实现的是值的双向传递。 应用类型的语法规定 引用#xff08;#xff09;是标识符的别名定义一个引用时#xff0c;必须同时对它进行初始化#xff0c;是他执行一个已存在的对象;定义引用以后马上就…3.15 引用类型C中值传递实现的是值得单向传递而引用传递实现的是值的双向传递。应用类型的语法规定引用是标识符的别名 定义一个引用时必须同时对它进行初始化是他执行一个已存在的对象;定义引用以后马上就要跟一个已经存在的变量联系起来得说清楚是谁的引用因此定义引用时必须初始化必须要用一个已经存在的对象或者变量初始化这个引用。 一旦一个引用被初始化后就不能改为指向其它对象。 C中引用大多用来作为函数的形参出现的进而实现函数参数的双向传递 int i,j; int rii;//定义int引用ri并初始化为变量i的引用例输入两个整数并交换值传递#include iostream using namespace std; void swap(int a, int b); int main() { int x; int y; cout 请输入要交换的整数值 endl; cin x y; swap(x, y); cout x的值为 x ,y的值为 y; return 0; } void swap(int a, int b) { int i; i a; a b; b i; cout a的值为 a ,b的值为 b; }其对应的汇编--- E:\C\C\3_13.cpp -------------------------------------------------------- 1: #include iostream 2: using namespace std; 3: void swap (int a, int b); 4: int main() { 00007FF60DC86960 40 55 push rbp 00007FF60DC86962 57 push rdi 00007FF60DC86963 48 81 EC 28 01 00 00 sub rsp,128h 00007FF60DC8696A 48 8D 6C 24 20 lea rbp,[rsp20h] 00007FF60DC8696F 48 8D 7C 24 20 lea rdi,[rsp20h] 00007FF60DC86974 B9 12 00 00 00 mov ecx,12h 00007FF60DC86979 B8 CC CC CC CC mov eax,0CCCCCCCCh 00007FF60DC8697E F3 AB rep stos dword ptr [rdi] 00007FF60DC86980 48 8B 05 79 66 00 00 mov rax,qword ptr [__security_cookie (07FF60DC8D000h)] 00007FF60DC86987 48 33 C5 xor rax,rbp 00007FF60DC8698A 48 89 85 F8 00 00 00 mov qword ptr [rbp0F8h],rax 00007FF60DC86991 48 8D 0D F0 C6 00 00 lea rcx,[__CEA39ACC_3_13cpp (07FF60DC93088h)] 00007FF60DC86998 E8 69 AA FF FF call __CheckForDebuggerJustMyCode (07FF60DC81406h) 00007FF60DC8699D 90 nop 5: int x; 6: int y; 7: cout 请输入要交换的整数值 endl; 00007FF60DC8699E 48 8D 15 43 43 00 00 lea rdx,[string \xc7\xeb\xca\xe4\xc8\xeb\xd2\xaa\xbd\xbb\xbb\xbb\xb5\xc4\xd5\xfb\xca\xfd\xd6\xb5 (07FF60DC8ACE8h)] 00007FF60DC869A5 48 8B 0D EC A7 00 00 mov rcx,qword ptr [__imp_std::cout (07FF60DC91198h)] 00007FF60DC869AC E8 DB A6 FF FF call std::operatorstd::char_traitschar (07FF60DC8108Ch) 00007FF60DC869B1 48 8D 15 84 A6 FF FF lea rdx,[std::endlchar,std::char_traitschar (07FF60DC8103Ch)] 00007FF60DC869B8 48 8B C8 mov rcx,rax 00007FF60DC869BB FF 15 BF A7 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF60DC91180h)] 00007FF60DC869C1 90 nop 8: cin x y; 00007FF60DC869C2 48 8D 55 04 lea rdx,[x] 00007FF60DC869C6 48 8B 0D 83 A7 00 00 mov rcx,qword ptr [__imp_std::cin (07FF60DC91150h)] 00007FF60DC869CD FF 15 8D A7 00 00 call qword ptr [__imp_std::basic_istreamchar,std::char_traitschar ::operator (07FF60DC91160h)] 00007FF60DC869D3 48 8D 55 24 lea rdx,[y] 00007FF60DC869D7 48 8B C8 mov rcx,rax 00007FF60DC869DA FF 15 80 A7 00 00 call qword ptr [__imp_std::basic_istreamchar,std::char_traitschar ::operator (07FF60DC91160h)] 00007FF60DC869E0 90 nop 9: swap(x, y); 00007FF60DC869E1 8B 55 24 mov edx,dword ptr [y] 00007FF60DC869E4 8B 4D 04 mov ecx,dword ptr [x] 00007FF60DC869E7 E8 83 AA FF FF call swap (07FF60DC8146Fh) 00007FF60DC869EC 90 nop 10: cout x的值为 x ,y的值为 y; 00007FF60DC869ED 48 8D 15 24 43 00 00 lea rdx,[string x\xb5\xc4\xd6\xb5\xce\xaa (07FF60DC8AD18h)] 00007FF60DC869F4 48 8B 0D 9D A7 00 00 mov rcx,qword ptr [__imp_std::cout (07FF60DC91198h)] 00007FF60DC869FB E8 8C A6 FF FF call std::operatorstd::char_traitschar (07FF60DC8108Ch) 00007FF60DC86A00 8B 55 04 mov edx,dword ptr [x] 00007FF60DC86A03 48 8B C8 mov rcx,rax 00007FF60DC86A06 FF 15 6C A7 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF60DC91178h)] 00007FF60DC86A0C 48 8D 15 F5 42 00 00 lea rdx,[string ,y\xb5\xc4\xd6\xb5\xce\xaa (07FF60DC8AD08h)] 00007FF60DC86A13 48 8B C8 mov rcx,rax 00007FF60DC86A16 E8 71 A6 FF FF call std::operatorstd::char_traitschar (07FF60DC8108Ch) 00007FF60DC86A1B 8B 55 24 mov edx,dword ptr [y] 00007FF60DC86A1E 48 8B C8 mov rcx,rax 00007FF60DC86A21 FF 15 51 A7 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF60DC91178h)] 00007FF60DC86A27 90 nop 11: return 0; 00007FF60DC86A28 33 C0 xor eax,eax 12: } 00007FF60DC86A2A 8B F8 mov edi,eax 00007FF60DC86A2C 48 8D 4D E0 lea rcx,[rbp-20h] 00007FF60DC86A30 48 8D 15 09 42 00 00 lea rdx,[__xt_z1A0h (07FF60DC8AC40h)] 00007FF60DC86A37 E8 5C A9 FF FF call _RTC_CheckStackVars (07FF60DC81398h) 00007FF60DC86A3C 8B C7 mov eax,edi 00007FF60DC86A3E 48 8B 8D F8 00 00 00 mov rcx,qword ptr [rbp0F8h] 00007FF60DC86A45 48 33 CD xor rcx,rbp 00007FF60DC86A48 E8 C5 A7 FF FF call __security_check_cookie (07FF60DC81212h) 00007FF60DC86A4D 48 8D A5 08 01 00 00 lea rsp,[rbp108h] 00007FF60DC86A54 5F pop rdi 00007FF60DC86A55 5D pop rbp 00007FF60DC86A56 C3 ret --- 无源文件 -----------------------------------------------------------------------例输入两个整数并交换引用传递#include iostream using namespace std; void swap(int a, int b); int main() { int x 5; int y 6; cout x x ,y y; swap(x, y); cout x x ,y y; return 0; } void swap(int a, int b) { int i; i a; a b; b i; }其对应的汇编--- E:\C\C\3_14.cpp -------------------------------------------------------- 1: #include iostream 2: using namespace std; 3: void swap(int a, int b); 4: int main() { 00007FF7146F65A0 40 55 push rbp 00007FF7146F65A2 57 push rdi 00007FF7146F65A3 48 81 EC 28 01 00 00 sub rsp,128h 00007FF7146F65AA 48 8D 6C 24 20 lea rbp,[rsp20h] 00007FF7146F65AF 48 8D 7C 24 20 lea rdi,[rsp20h] 00007FF7146F65B4 B9 12 00 00 00 mov ecx,12h 00007FF7146F65B9 B8 CC CC CC CC mov eax,0CCCCCCCCh 00007FF7146F65BE F3 AB rep stos dword ptr [rdi] 00007FF7146F65C0 48 8B 05 39 6A 00 00 mov rax,qword ptr [__security_cookie (07FF7146FD000h)] 00007FF7146F65C7 48 33 C5 xor rax,rbp 00007FF7146F65CA 48 89 85 F8 00 00 00 mov qword ptr [rbp0F8h],rax 00007FF7146F65D1 48 8D 0D B1 CA 00 00 lea rcx,[__7C8346DC_3_14cpp (07FF714703089h)] 00007FF7146F65D8 E8 15 AE FF FF call __CheckForDebuggerJustMyCode (07FF7146F13F2h) 00007FF7146F65DD 90 nop 5: int x 5; 00007FF7146F65DE C7 45 04 05 00 00 00 mov dword ptr [x],5 6: int y 6; 00007FF7146F65E5 C7 45 24 06 00 00 00 mov dword ptr [y],6 7: cout x x ,y y; 00007FF7146F65EC 48 8D 15 F5 46 00 00 lea rdx,[string x (07FF7146FACE8h)] 00007FF7146F65F3 48 8B 0D 9E AB 00 00 mov rcx,qword ptr [__imp_std::cout (07FF714701198h)] 00007FF7146F65FA E8 8D AA FF FF call std::operatorstd::char_traitschar (07FF7146F108Ch) 00007FF7146F65FF 8B 55 04 mov edx,dword ptr [x] 00007FF7146F6602 48 8B C8 mov rcx,rax 00007FF7146F6605 FF 15 9D AB 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF7147011A8h)] 00007FF7146F660B 48 8D 15 D2 46 00 00 lea rdx,[string ,y (07FF7146FACE4h)] 00007FF7146F6612 48 8B C8 mov rcx,rax 00007FF7146F6615 E8 72 AA FF FF call std::operatorstd::char_traitschar (07FF7146F108Ch) 00007FF7146F661A 8B 55 24 mov edx,dword ptr [y] 00007FF7146F661D 48 8B C8 mov rcx,rax 00007FF7146F6620 FF 15 82 AB 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF7147011A8h)] 00007FF7146F6626 90 nop 8: swap(x, y); 00007FF7146F6627 48 8D 55 24 lea rdx,[y] 00007FF7146F662B 48 8D 4D 04 lea rcx,[x] 00007FF7146F662F E8 21 AA FF FF call swap (07FF7146F1055h) 00007FF7146F6634 90 nop 9: cout x x ,y y; 00007FF7146F6635 48 8D 15 AC 46 00 00 lea rdx,[string x (07FF7146FACE8h)] 00007FF7146F663C 48 8B 0D 55 AB 00 00 mov rcx,qword ptr [__imp_std::cout (07FF714701198h)] 00007FF7146F6643 E8 44 AA FF FF call std::operatorstd::char_traitschar (07FF7146F108Ch) 00007FF7146F6648 8B 55 04 mov edx,dword ptr [x] 00007FF7146F664B 48 8B C8 mov rcx,rax 00007FF7146F664E FF 15 54 AB 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF7147011A8h)] 00007FF7146F6654 48 8D 15 89 46 00 00 lea rdx,[string ,y (07FF7146FACE4h)] 00007FF7146F665B 48 8B C8 mov rcx,rax 00007FF7146F665E E8 29 AA FF FF call std::operatorstd::char_traitschar (07FF7146F108Ch) 00007FF7146F6663 8B 55 24 mov edx,dword ptr [y] 00007FF7146F6666 48 8B C8 mov rcx,rax 00007FF7146F6669 FF 15 39 AB 00 00 call qword ptr [__imp_std::basic_ostreamchar,std::char_traitschar ::operator (07FF7147011A8h)] 00007FF7146F666F 90 nop 10: return 0; 00007FF7146F6670 33 C0 xor eax,eax 11: } 00007FF7146F6672 8B F8 mov edi,eax 00007FF7146F6674 48 8D 4D E0 lea rcx,[rbp-20h] 00007FF7146F6678 48 8D 15 C1 45 00 00 lea rdx,[__xt_z1A0h (07FF7146FAC40h)] 00007FF7146F667F E8 00 AD FF FF call _RTC_CheckStackVars (07FF7146F1384h) 00007FF7146F6684 8B C7 mov eax,edi 00007FF7146F6686 48 8B 8D F8 00 00 00 mov rcx,qword ptr [rbp0F8h] 00007FF7146F668D 48 33 CD xor rcx,rbp 00007FF7146F6690 E8 73 AB FF FF call __security_check_cookie (07FF7146F1208h) 00007FF7146F6695 48 8D A5 08 01 00 00 lea rsp,[rbp108h] 00007FF7146F669C 5F pop rdi 00007FF7146F669D 5D pop rbp 00007FF7146F669E C3 ret --- 无源文件 -----------------------------------------------------------------------