user-0 提问: 关于ASCII的问题

回复:
user: user-1
content: 只有可视字符才能正常显示：  32～126(共95个)是字符(32是空格），其中48～57为0到9十个阿拉伯数字 65～90为26个大写英文字母，97～122号为26个小写英文字母，其余为一些标点符号、运算符号等。   引用 楼主 syj52417 的回复:为什么我的计算机识别不了一些ASCII中的字符  int x=1; printf("%c",x);  这样就可以输出ASCII为1的字符，当x变成其他值比方说 x=251，字符应该是个    勾 ，为什么控制台输出只显示个问号，这是为什么？

user: user-2
content: 引用 5 楼 baichi4141 的回复:简单的说，ASCII码的有效数值是1～127，大于等于128的数在ASCII码中没有对应字符，不管你的程序中显示出来的使什么玩意，都跟ASCII码表无关 补充一句：某些编译器的ASCII码值是0~255的，比如win-tc 某些编译器的ASCII码值是-128~127的，比如vc、cfree、gcc

user: user-3
content: 简单的说，ASCII码的有效数值是1～127，大于等于128的数在ASCII码中没有对应字符，不管你的程序中显示出来的使什么玩意，都跟ASCII码表无关

user: user-4
content: 引用 楼主 syj52417 的回复:为什么我的计算机识别不了一些ASCII中的字符  int x=1; printf("%c",x);  这样就可以输出ASCII为1的字符，当x变成其他值比方说 x=251，字符应该是个    勾 ，为什么控制台输出只显示个问号，这是为什么？  将x赋值为65，你就知道了。顺便了解下：哪些是可显示字符，哪里不是!!

user: user-5
content: 引用 楼主 syj52417 的回复:为什么我的计算机识别不了一些ASCII中的字符  int x=1; printf("%c",x);  这样就可以输出ASCII为1的字符，当x变成其他值比方说 x=251，字符应该是个    勾 ，为什么控制台输出只显示个问号，这是为什么？ ASCII码表，不可显示字符，用的是示意符号表示，并不是那个字符可以在屏幕上那样显示。

user: user-6

user: user-6
content: #pragma comment(lib,"user32") #pragma comment(lib,"gdi32") #include <conio.h> #include <stdio.h> #include <stdlib.h> #include <windows.h> wchar_t a2w[256]={ 0x0020,0x263a,0x263b,0x2665,0x2666,0x2663,0x2660,0x2022, 0x25d8,0x25cb,0x25d9,0x2642,0x2640,0x266a,0x266b,0x263c, 0x25ba,0x25c4,0x2195,0x203c,0x00b6,0x00a7,0x25ac,0x21a8, 0x2191,0x2193,0x2192,0x2190,0x221f,0x2194,0x25b2,0x25bc, 0x0020,0x0021,0x0022,0x0023,0x0024,0x0025,0x0026,0x0027, 0x0028,0x0029,0x002a,0x002b,0x002c,0x002d,0x002e,0x002f, 0x0030,0x0031,0x0032,0x0033,0x0034,0x0035,0x0036,0x0037, 0x0038,0x0039,0x003a,0x003b,0x003c,0x003d,0x003e,0x003f, 0x0040,0x0041,0x0042,0x0043,0x0044,0x0045,0x0046,0x0047, 0x0048,0x0049,0x004a,0x004b,0x004c,0x004d,0x004e,0x004f, 0x0050,0x0051,0x0052,0x0053,0x0054,0x0055,0x0056,0x0057, 0x0058,0x0059,0x005a,0x005b,0x005c,0x005d,0x005e,0x005f, 0x0060,0x0061,0x0062,0x0063,0x0064,0x0065,0x0066,0x0067, 0x0068,0x0069,0x006a,0x006b,0x006c,0x006d,0x006e,0x006f, 0x0070,0x0071,0x0072,0x0073,0x0074,0x0075,0x0076,0x0077, 0x0078,0x0079,0x007a,0x007b,0x007c,0x007d,0x007e,0x2302, 0x00c7,0x00fc,0x00e9,0x00e2,0x00e4,0x00e0,0x00e5,0x00e7, 0x00ea,0x00eb,0x00e8,0x00ef,0x00ee,0x00ec,0x00c4,0x00c5, 0x00e9,0x00e6,0x00c6,0x00f4,0x00f6,0x00f2,0x00fb,0x00f9, 0x00ff,0x00d6,0x00dc,0x00a2,0x00a3,0x00a5,0x20a7,0x0192, 0x00e1,0x00ed,0x00f3,0x00fa,0x00f1,0x00d1,0x00aa,0x00ba, 0x00bf,0x2310,0x00ac,0x00bd,0x00bc,0x00a1,0x00ab,0x00bb, 0x2591,0x2592,0x2593,0x2502,0x2524,0x2561,0x2562,0x2556, 0x2555,0x2563,0x2551,0x2557,0x255d,0x255c,0x255b,0x2510, 0x2514,0x2534,0x252c,0x251c,0x2500,0x253c,0x255e,0x255f, 0x255a,0x2554,0x2569,0x2566,0x2560,0x2550,0x256c,0x2567, 0x2568,0x2564,0x2565,0x2559,0x2558,0x2552,0x2553,0x256b, 0x256a,0x2518,0x250c,0x2588,0x2584,0x258c,0x2590,0x2580, 0x03b1,0x00df,0x0393,0x03c0,0x03a3,0x03c3,0x00b5,0x03c4, 0x03a6,0x0398,0x03a9,0x03b4,0x221e,0x03c6,0x03b5,0x2229, 0x2261,0x00b1,0x2265,0x2264,0x2320,0x2321,0x00f7,0x2248, 0x00b0,0x2219,0x00b7,0x221a,0x207f,0x00b2,0x25a0,0x00ff, }; extern "C" HWND WINAPI GetConsoleWindow(); void HideTheCursor() {     CONSOLE_CURSOR_INFO cciCursor;     HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);      if(GetConsoleCursorInfo(hStdOut, &cciCursor)) {         cciCursor.bVisible = FALSE;         SetConsoleCursorInfo(hStdOut, &cciCursor);     } } void ShowTheCursor() {     CONSOLE_CURSOR_INFO cciCursor;     HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);      if(GetConsoleCursorInfo(hStdOut, &cciCursor)) {         cciCursor.bVisible = TRUE;         SetConsoleCursorInfo(hStdOut, &cciCursor);     } } int main() {     HWND  hwnd;     HDC   hdc;     HFONT hfont;     wchar_t ws[256];     unsigned char s[256];     int i;       system("color F0");     system("cls");     HideTheCursor();     hwnd  = GetConsoleWindow();     hdc   = GetDC(hwnd);     hfont = CreateFont(16,  0, 0, 0, 0, 0, 0, 0, 0           , 0, 0, 0, 0, "Lucida Console");     SelectObject(hdc,hfont);     TextOutW(hdc,10,10,L"你好",2);     for (i=0;i<256;i++) s[i]=i;     for (i=0;i<256;i++) ws[i]=a2w[s[i]];     TextOutW(hdc,10, 40,ws    ,32);     TextOutW(hdc,10, 80,ws+ 32,32);     TextOutW(hdc,10,120,ws+ 64,32);     TextOutW(hdc,10,160,ws+ 96,32);     TextOutW(hdc,10,200,ws+128,32);     TextOutW(hdc,10,240,ws+160,32);     TextOutW(hdc,10,280,ws+192,32);     TextOutW(hdc,10,320,ws+224,32);     DeleteObject(hfont);     ReleaseDC(hwnd,hdc);     getch();     system("color 07");     system("cls");     ShowTheCursor();     return 0; }