入门菜鸟碰难题，学长学姐们快来看看

#include<iostream> using namespace std; int main() { double i=5.78; const int &r=i; cout<<"之前i="<<i<<"\t"<<"r="<<r<<endl; i=i+i; cout<<"之后i="<<i<<"\t"<<"r="<<r<<endl; return 0; } 可是这个又可以正常输出

为毛我的就出问题呢，看3楼，改了就木问题，改回去又出问题，想不明白。。。 【 在 Bishop 的大作中提到: 】 : 是正常显示。。。

正常 因为10比5多一位。。多的这一位刚好让上一个\t放不下了，只能往后挪。。

这跟const 引用有毛关系

还是先把const拼写对再说吧

贴汇编： .file "main.cpp" .local _ZStL8__ioinit .comm _ZStL8__ioinit,1,1 .section .rodata .LC0: .string "\344\271\213\345\211\215i=" .LC1: .string "\t" .LC2: .string "r=" .LC3: .string "\344\271\213\345\220\216i=" .text .globl main .type main, @function main: .LFB957: .cfi_startproc .cfi_personality 0x0,__gxx_personality_v0 pushl %ebp .cfi_def_cfa_offset 8 .cfi_offset 5, -8 movl %esp, %ebp .cfi_def_cfa_register 5 andl $-16, %esp pushl %esi pushl %ebx subl $40, %esp movl $5, 24(%esp) leal 24(%esp), %eax movl %eax, 28(%esp) movl 28(%esp), %eax movl (%eax), %ebx .cfi_escape 0x10,0x3,0x7,0x75,0x0,0x9,0xf0,0x1a,0x38,0x1c .cfi_escape 0x10,0x6,0x7,0x75,0x0,0x9,0xf0,0x1a,0x34,0x1c movl 24(%esp), %esi movl $.LC0, 4(%esp) movl $_ZSt4cout, (%esp) call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc movl %esi, 4(%esp) movl %eax, (%esp) call _ZNSolsEi movl $.LC1, 4(%esp) movl %eax, (%esp) call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc movl $.LC2, 4(%esp) movl %eax, (%esp) call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc movl %ebx, 4(%esp) movl %eax, (%esp) call _ZNSolsEi movl $_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, 4(%esp) movl %eax, (%esp) call _ZNSolsEPFRSoS_E movl 24(%esp), %edx movl 24(%esp), %eax leal (%edx,%eax), %eax movl %eax, 24(%esp) movl 28(%esp), %eax movl (%eax), %ebx movl 24(%esp), %esi movl $.LC3, 4(%esp) movl $_ZSt4cout, (%esp) call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc movl %esi, 4(%esp) movl %eax, (%esp) call _ZNSolsEi movl $.LC1, 4(%esp) movl %eax, (%esp) call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc movl $.LC2, 4(%esp) movl %eax, (%esp) call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc movl %ebx, 4(%esp) movl %eax, (%esp) call _ZNSolsEi movl $_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, 4(%esp) movl %eax, (%esp) call _ZNSolsEPFRSoS_E movl $0, %eax addl $40, %esp popl %ebx .cfi_restore 3 popl %esi .cfi_restore 6 movl %ebp, %esp .cfi_def_cfa_register 4 popl %ebp .cfi_restore 5 .cfi_def_cfa_offset 4 ret .cfi_endproc .LFE957: .size main, .-main .type _Z41__static_initialization_and_destruction_0ii, @function _Z41__static_initialization_and_destruction_0ii: .LFB966: .cfi_startproc .cfi_personality 0x0,__gxx_personality_v0 pushl %ebp .cfi_def_cfa_offset 8 .cfi_offset 5, -8 movl %esp, %ebp .cfi_def_cfa_register 5 subl $24, %esp cmpl $1, 8(%ebp) jne .L5 cmpl $65535, 12(%ebp) jne .L5 movl $_ZStL8__ioinit, (%esp) call _ZNSt8ios_base4InitC1Ev movl $_ZNSt8ios_base4InitD1Ev, %eax movl $__dso_handle, 8(%esp) movl $_ZStL8__ioinit, 4(%esp) movl %eax, (%esp) call __cxa_atexit .L5: leave .cfi_restore 5 .cfi_def_cfa 4, 4 ret .cfi_endproc .LFE966: .size _Z41__static_initialization_and_destruction_0ii, .-_Z41__static_initialization_and_destruction_0ii .type _GLOBAL__I_main, @function _GLOBAL__I_main: .LFB967: .cfi_startproc .cfi_personality 0x0,__gxx_personality_v0 pushl %ebp .cfi_def_cfa_offset 8 .cfi_offset 5, -8 movl %esp, %ebp .cfi_def_cfa_register 5 subl $24, %esp movl $65535, 4(%esp) movl $1, (%esp) call _Z41__static_initialization_and_destruction_0ii leave .cfi_restore 5 .cfi_def_cfa 4, 4 ret .cfi_endproc .LFE967: .size _GLOBAL__I_main, .-_GLOBAL__I_main .section .ctors,"aw",@progbits .align 4 .long _GLOBAL__I_main .weakref _ZL20__gthrw_pthread_oncePiPFvvE,pthread_once .weakref _ZL27__gthrw_pthread_getspecificj,pthread_getspecific .weakref _ZL27__gthrw_pthread_setspecificjPKv,pthread_setspecific .weakref _ZL22__gthrw_pthread_createPmPK14pthread_attr_tPFPvS3_ES3_,pthread_create .weakref _ZL20__gthrw_pthread_joinmPPv,pthread_join .weakref _ZL21__gthrw_pthread_equalmm,pthread_equal .weakref _ZL20__gthrw_pthread_selfv,pthread_self .weakref _ZL22__gthrw_pthread_detachm,pthread_detach .weakref _ZL22__gthrw_pthread_cancelm,pthread_cancel .weakref _ZL19__gthrw_sched_yieldv,sched_yield .weakref _ZL26__gthrw_pthread_mutex_lockP15pthread_mutex_t,pthread_mutex_lock .weakref _ZL29__gthrw_pthread_mutex_trylockP15pthread_mutex_t,pthread_mutex_trylock .weakref _ZL31__gthrw_pthread_mutex_timedlockP15pthread_mutex_tPK8timespec,pthread_mutex_timedlock .weakref _ZL28__gthrw_pthread_mutex_unlockP15pthread_mutex_t,pthread_mutex_unlock .weakref _ZL26__gthrw_pthread_mutex_initP15pthread_mutex_tPK19pthread_mutexattr_t,pthread_mutex_init .weakref _ZL29__gthrw_pthread_mutex_destroyP15pthread_mutex_t,pthread_mutex_destroy .weakref _ZL30__gthrw_pthread_cond_broadcastP14pthread_cond_t,pthread_cond_broadcast .weakref _ZL27__gthrw_pthread_cond_signalP14pthread_cond_t,pthread_cond_signal .weakref _ZL25__gthrw_pthread_cond_waitP14pthread_cond_tP15pthread_mutex_t,pthread_cond_wait .weakref _ZL30__gthrw_pthread_cond_timedwaitP14pthread_cond_tP15pthread_mutex_tPK8timespec,pthread_cond_timedwait .weakref _ZL28__gthrw_pthread_cond_destroyP14pthread_cond_t,pthread_cond_destroy .weakref _ZL26__gthrw_pthread_key_createPjPFvPvE,pthread_key_create .weakref _ZL26__gthrw_pthread_key_deletej,pthread_key_delete .weakref _ZL30__gthrw_pthread_mutexattr_initP19pthread_mutexattr_t,pthread_mutexattr_init .weakref _ZL33__gthrw_pthread_mutexattr_settypeP19pthread_mutexattr_ti,pthread_mutexattr_settype .weakref _ZL33__gthrw_pthread_mutexattr_destroyP19pthread_mutexattr_t,pthread_mutexattr_destroy .ident "GCC: (GNU) 4.4.7 20120313 (Red Hat 4.4.7-4)" .section .note.GNU-stack,"",@progbits

看我写的啊，大哥，我是想验证const引用的问题才编的程，然后问题验证了，意外出了别的问题 【 在 xiaoyu2008 的大作中提到: 】 : 这跟const 引用有毛关系

错了吗？ 【 在 angle 的大作中提到: 】 : 还是先把const拼写对再说吧

菜鸟表示看不懂 【 在 FromSixToTen 的大作中提到: 】 : 贴汇编： : .file "main.cpp" : .local _ZStL8__ioinit : ...................