(A) 0000000000600e20 d _DYNAMIC 0000000000600fe8 d GLOBAL_OFFSET_TABLE 00000000004006c5 t _GLOBAL__sub_I__Z7averagePdRd 00000000004007c8 R _IO_stdin_used w _Jv_RegisterClasses 0000000000400685 t _Z41__static_initialization_and_destruction_0ii 0000000000400624 T _Z7averagePdRd 0000000000400652 T _Z7averageif U _ZNSt8ios_base4InitC1Ev@@GLIBCXX_3.4 U _ZNSt8ios_base4InitD1Ev@@GLIBCXX_3.4 0000000000601040 b _ZStL8__ioinit 0000000000600e00 d CTOR_END 0000000000600df8 d CTOR_LIST 0000000000600e10 D DTOR_END 0000000000600e08 d DTOR_LIST 0000000000400948 r FRAME_END 0000000000600e18 d JCR_END 0000000000600e18 d JCR_LIST 0000000000601030 A __bss_start U __cxa_atexit@@GLIBC_2.2.5 0000000000601020 D __data_start 0000000000400780 t __do_global_ctors_aux 0000000000400590 t __do_global_dtors_aux 0000000000601028 D __dso_handle w gmon_start 0000000000600df8 t __init_array_end 0000000000600df0 t __init_array_start 0000000000400770 T __libc_csu_fini 00000000004006e0 T __libc_csu_init U __libc_start_main@@GLIBC_2.2.5 0000000000601030 A _edata 0000000000601048 A _end 00000000004007b8 T _fini 00000000004004d8 T _init 0000000000400540 T _start 000000000040056c t call_gmon_start 0000000000601030 b completed.6531 0000000000601020 W data_start 0000000000601038 b dtor_idx.6533 0000000000400600 t frame_dummy 000000000040067a T main

(B) 1 8 4 8 4 8 8 8 the size of char = 1 byte the size of int = 4 bytes the size of float = 4bytes the size of double = 8 bytes the size of pointer in 64-bit computer = 8 bytes