{"id":2571,"date":"2020-03-21T18:27:04","date_gmt":"2020-03-21T18:27:04","guid":{"rendered":"https:\/\/itteacheritfreelance.hk\/wordpress\/?p=2571"},"modified":"2020-04-23T15:33:21","modified_gmt":"2020-04-23T15:33:21","slug":"printf-and-scanf","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/2020\/03\/21\/printf-and-scanf\/","title":{"rendered":"printf() \u8207 scanf()"},"content":{"rendered":"

\n<\/p>\n\n\n

\n\n\u5728C\u8bed\u8a00\u4e2d\u662f\u7528printf\u51fd\u6570\u8fdb\u884c\u8f93\u51fa\uff0c\u7528scanf\u51fd\u6570\u8fdb\u884c\u8f93\u5165\u7684\u3002C++\u4fdd\u7559\u4e86C\u8bed\u8a00\u7684\u8fd9\u4e00\u7528\u6cd5\uff0c\u5728\u6b64\u53ea\u4f5c\u5f88\u7b80\u5355\u7684\u4ecb\u7ecd\u3002\u66f4\u591a\u5185\u5bb9\u8bf7\u67e5\u770b\uff1a<\/p>\n\n\n\n

\"C++
C\/C++<\/figcaption><\/figure>\n\n\n\n

scanf\u51fd\u6570\u4e00\u822c\u683c\u5f0f\u662f\uff1a
    scanf(\u683c\u5f0f\u63a7\u5236, \u8f93\u51fa\u8868\u5217) <\/h2>\n\n\n\n

\u3010\u4f8b\u3011\u7528scanf\u548cprintf\u51fd\u6570\u8fdb\u884c\u8f93\u5165\u548c\u8f93\u51fa\u3002<\/p>\n\n\n\n

#include <iostream>using<\/strong> namespace<\/strong> std;int main( ){  int a; float b; char c;  scanf(\"%d %c %f\",&a,&c,&b);  \/\/\u6ce8\u610f\u5728\u53d8\u91cf\u540d\u524d\u8981\u52a0\u5730\u5740\u8fd0\u7b97\u7b26&  printf(\"a=%d,b=%f,c=%c\\n\",a,b,c);  return<\/strong> 0;}<\/pre>\n\n\n\n
\u8fd0\u884c\u60c5\u51b5\u5982\u4e0b:
12 A 67.98\u2199(\u672c\u884c\u4e3a\u8f93\u5165\uff0c\u8f93\u5165\u76843\u4e2a\u6570\u636e\u95f4\u4ee5\u7a7a\u683c\u76f8\u95f4)
a=12\uff0cb=67.980003\uff0cc=A(\u672c\u884c\u4e3a\u8f93\u51fa)<\/p>\n\n\n\n
\u8f93\u5165\u7684\u6574\u657012\u9001\u7ed9\u6574\u578b\u53d8\u91cfa\uff0c\u5b57\u7b26’A’\u9001\u7ed9\u5b57\u7b26\u53d8\u91cfc\uff0c67.98\u9001\u7ed9\u5355\u7cbe\u5ea6\u53d8\u91cfb\u3002\n\n<\/p>\n\n\n\n
printf() \u8207 scanf() 
\u5b78\u7fd2 C \u7684\u904e\u7a0b\u4e2d\uff0c\u901a\u5e38\u662f\u5f9e\u4e3b\u63a7\u53f0\uff0c\u4e5f\u5c31\u662f\u6587\u5b57\u6a21\u5f0f\u4e0b\u958b\u59cb\uff0c\u70ba\u4e86\u8207\u7a0b\u5f0f\u4e92\u52d5\uff0c\u5728\u4e3b\u63a7\u53f0\u4e0b\u8f38\u51fa\u7a0b\u5f0f\u57f7\u884c\u7d50\u679c\uff0c\u6216\u662f\u5f9e\u4e3b\u63a7\u53f0\u53d6\u5f97\u4f7f\u7528\u8005\u7684\u8f38\u5165\u8cc7\u6599\u662f\u57fa\u672c\u9700\u6c42\uff0c\u5728 C \u4e2d\u6a19\u6e96\u8f38\u5165\u8f38\u51fa\u662f\u7531 stdio<\/code> \u63d0\u4f9b\uff0c\u9019\u4e5f\u5c31\u662f\u70ba\u4f55\u60a8\u8981\u5728\u7a0b\u5f0f\u7684\u4e00\u958b\u982d\u7d42\u662f\u52a0\u4e0a\uff1a<\/p>\n\n\n\n
#include <stdio.h><\/code><\/pre>\n\n\n\n
\u5c07\u8a0a\u606f\u8f38\u51fa\u81f3\u4e3b\u63a7\u53f0\uff0c\u7a31\u4e4b\u70ba\u6a19\u6e96\u8f38\u51fa\uff08Stand output\uff09\uff0cC \u85c9\u7531 printf()<\/code> \u5c07\u8a0a\u606f\u8f38\u51fa\u81f3\u4e3b\u63a7\u53f0\uff0c\u81f3\u4eca\u5df2\u7d93\u770b\u904e\u5e7e\u500b printf()<\/code> \u51fd\u5f0f\u7684\u61c9\u7528\u4e86\uff0c\u57fa\u672c\u4e0a\uff0cprintf()<\/code> \u5c31\u662f\u5c07\u6307\u5b9a\u7684\u6587\u5b57\u3001\u6578\u503c\u7b49\u8f38\u51fa\u81f3\u87a2\u5e55\u4e0a\uff0c\u4e26\u4e14\u57f7\u884c\u904e\u5f8c\u6703\u50b3\u56de\u6240\u8f38\u51fa\u7684\u5b57\u5143\u6578\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
#include <stdio.h>\n\nint main(void) {\n    int count = printf(\"This is a test!\\n\");\n    printf(\"%d\\n\", count);\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\"This is a test!\\n\"<\/code> \u7576\u4e2d\u5305\u62ec\u63db\u884c\u5b57\u5143\uff0c\u5171\u6709 16 \u500b\u5b57\u5143\uff0c\u56e0\u6b64 count<\/code> \u7684\u503c\u6703\u662f 16\uff0c\u986f\u793a\u7d50\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
This is a test!\n16<\/code><\/pre>\n\n\n\n
\u6a19\u6e96\u8f38\u51fa\u53ef\u4ee5\u88ab\u91cd\u65b0\u5c0e\u5411\u81f3\u6a94\u6848\uff0c\u53ef\u4ee5\u5728\u57f7\u884c\u7a0b\u5f0f\u6642\u4f7f\u7528 >><\/code> \u5c07\u8f38\u51fa\u7d50\u679c\u5c0e\u5411\u81f3\u6307\u5b9a\u6a94\u6848\uff0c\u4f8b\u5982\uff08\u5047\u8a2d\u7de8\u8b6f\u5f8c\u7684\u53ef\u57f7\u884c\u6a94\u70ba main\uff09\uff1a<\/p>\n\n\n\n
main >> result.txt<\/code><\/pre>\n\n\n\n
\u5982\u679c\u7a0b\u5f0f\u7684\u76ee\u7684\u662f\u986f\u793a \"Hello! World!\"<\/code>\uff0c\u5247\u4e0a\u9762\u7684\u57f7\u884c\u6703\u5c07\u7d50\u679c\u5c0e\u5411\u81f3 result.txt\uff0c\u800c\u4e0d\u6703\u5728\u87a2\u5e55\u4e0a\u986f\u793a \"Hello! World!\"<\/code>\uff0cresult.txt\u4e2d\u5c07\u6703\u6709\u8f38\u51fa\u7d50\u679c Hello! World!\u3002<\/p>\n\n\n\n
\u8981\u91cd\u65b0\u5c0e\u5411\u6a19\u6e96\u8f38\u51fa\u662f\u7528 ><\/code>,\u6a19\u6e96\u8f38\u5165\u5247\u662f <<\/code>\uff0c\u800c >><\/code> \u9664\u4e86\u91cd\u5c0e\u6a19\u6e96\u8f38\u51fa\uff0c\u9084\u6709\u9644\u52a0\u7684\u529f\u80fd\uff0c\u4e5f\u5c31\u662f\u6703\u628a\u8f38\u51fa\u9644\u52a0\u5230\u88ab\u5c0e\u5411\u7684\u76ee\u6a19\u6a94\u6848\u5f8c\u982d\uff0c\u5982\u679c\u76ee\u6a19\u6a94\u6848\u672c\u4f86\u4e0d\u5b58\u5728\uff0c\u90a3\u9ebc\u6548\u679c\u5c31\u548c ><\/code> \u4e00\u6a23\u3002<\/p>\n\n\n\n
\u6574\u6578\u3001\u6d6e\u9ede\u6578\u3001\u5b57\u5143 <\/h2>\n\n\n\n
\u5982\u679c\u5728\u4f7f\u7528 printf()<\/code> \u6642\u8981\u6307\u5b9a\u6574\u6578\u3001\u6d6e\u9ede\u6578\u3001\u5b57\u5143\u7b49\u9032\u884c\u986f\u793a\uff0c\u5247\u8981\u914d\u5408\u683c\u5f0f\u6307\u5b9a\u5b57\uff08format specifier\uff09\uff0c\u4ee5\u4e0b\u5217\u51fa\u5e7e\u500b\u53ef\u7528\u7684\u683c\u5f0f\u6307\u5b9a\u78bc\uff1a<\/p>\n\n\n\n
%c<\/code><\/td>\u4ee5\u5b57\u5143\u65b9\u5f0f\u8f38\u51fa<\/td><\/tr>
%d<\/code><\/td>10 \u9032\u4f4d\u6574\u6578\u8f38\u51fa<\/td><\/tr>
%o<\/td>\u4ee5 8 \u9032\u4f4d\u6574\u6578\u65b9\u5f0f\u8f38\u51fa<\/td><\/tr>
%u<\/code><\/td>\u7121\u865f\u6574\u6578\u8f38\u51fa<\/td><\/tr>
%x, %X<\/code><\/td>\u5c07\u6574\u6578\u4ee5 16 \u9032\u4f4d\u65b9\u5f0f\u8f38\u51fa<\/td><\/tr>
%f<\/code><\/td>\u6d6e\u9ede\u6578\u8f38\u51fa<\/td><\/tr>
%e, %E<\/code><\/td>\u4f7f\u7528\u79d1\u5b78\u8a18\u865f\u986f\u793a\u6d6e\u9ede\u6578<\/td><\/tr>
%g, %G<\/code><\/td>\u6d6e\u9ede\u6578\u8f38\u51fa\uff0c\u53d6 %f<\/code> \u6216 %e<\/code>\uff08%f<\/code> \u6216 %E<\/code>\uff09\uff0c\u770b\u54ea\u500b\u8868\u793a\u7cbe\u7c21<\/td><\/tr>
%%<\/code><\/td>\u986f\u793a %<\/code><\/td><\/tr>
%s<\/code><\/td>\u5b57\u4e32\u8f38\u51fa<\/td><\/tr>
%lu<\/code><\/td>long unsigned<\/code> \u578b\u614b\u7684\u6574\u6578<\/td><\/tr>
%p<\/code><\/td>\u6307\u6a19\u578b\u614b<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u57fa\u672c\u4e0a\uff0c\u8981\u986f\u793a\u7684\u662f\u4ec0\u9ebc\u8cc7\u6599\u578b\u614b\uff0c\u5c31\u5fc5\u9808\u642d\u914d\u5c0d\u61c9\u8cc7\u6599\u578b\u614b\u7684\u683c\u5f0f\u6307\u5b9a\u5b57\uff0c\u4f46 %d<\/code> \u82e5\u7528\u4f86\u8f38\u51fa\u67d0\u500b\u5b57\u5143\uff0c\u5c07\u986f\u793a\u5176\u6574\u6578\u7de8\u78bc\u503c\uff0c\u82e5 %c<\/code> \u7528\u4f86\u986f\u793a\u67d0\u500b\u6574\u6578\uff0c\u5c07\u986f\u793a\u8a72\u6574\u6578\u5c0d\u61c9\u7de8\u78bc\u7684\u5b57\u5143\uff0c\u4e00\u500b\u4f7f\u7528\u7684\u7bc4\u4f8b\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
 \u4f8b\u5982 <\/h2>\n\n\n\n
#include <stdio.h>\n\nint main(void) {\n    printf(\"\u986f\u793a\u5b57\u5143 %c\\n\", 'A');\n    printf(\"\u986f\u793a\u5b57\u5143\u7de8\u78bc %d\\n\", 'A');\n    printf(\"\u986f\u793a\u5b57\u5143\u7de8\u78bc %c\\n\", 65);    \n    printf(\"\u986f\u793a\u5341\u9032\u4f4d\u6574\u6578 %d\\n\", 15);\n    printf(\"\u986f\u793a\u516b\u9032\u4f4d\u6574\u6578 %o\\n\", 15);\n    printf(\"\u986f\u793a\u5341\u516d\u9032\u4f4d\u6574\u6578 %X\\n\", 15);\n    printf(\"\u986f\u793a\u5341\u516d\u9032\u4f4d\u6574\u6578 %x\\n\", 15);    \n    printf(\"\u986f\u793a\u79d1\u5b78\u8a18\u865f %E\\n\", 0.001234);    \n    printf(\"\u986f\u793a\u79d1\u5b78\u8a18\u865f %e\\n\", 0.001234);    \n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u986f\u793a\u7d50\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n
\u986f\u793a\u5b57\u5143 A\n\u986f\u793a\u5b57\u5143\u7de8\u78bc 65\n\u986f\u793a\u5b57\u5143\u7de8\u78bc A\n\u986f\u793a\u5341\u9032\u4f4d\u6574\u6578 15\n\u986f\u793a\u516b\u9032\u4f4d\u6574\u6578 17\n\u986f\u793a\u5341\u516d\u9032\u4f4d\u6574\u6578 F\n\u986f\u793a\u5341\u516d\u9032\u4f4d\u6574\u6578 f\n\u986f\u793a\u79d1\u5b78\u8a18\u865f 1.234000E-03\n\u986f\u793a\u79d1\u5b78\u8a18\u865f 1.234000e-03<\/code><\/pre>\n\n\n\n
\u60a8\u53ef\u4ee5\u5728\u8f38\u51fa\u6d6e\u9ede\u6578\u6642\u6307\u5b9a\u7cbe\u5ea6\uff0c\u4f8b\u5982\u82e5\u70ba\u6d6e\u9ede\u6578\uff1a<\/p>\n\n\n\n
printf(\"example:%.2f\\n\", 19.234);<\/code><\/pre>\n\n\n\n
.2<\/code> \u6307\u5b9a\u5c0f\u6578\u9ede\u5f8c\u53d6\u5169\u4f4d\uff0c\u57f7\u884c\u7d50\u679c\u6703\u8f38\u51fa\uff1a<\/p>\n\n\n\n
example:19.23<\/code><\/pre>\n\n\n\n
\u4e5f\u53ef\u4ee5\u6307\u5b9a\u8f38\u51fa\u6642\uff0c\u81f3\u5c11\u8981\u9810\u7559\u7684\u5b57\u5143\u5bec\u5ea6\uff0c\u7121\u8ad6\u662f\u6578\u503c\u6216\u5b57\u4e32\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
printf(\"example:%6.2f\\n\", 19.234);<\/code><\/pre>\n\n\n\n
\u6574\u6578 6 \u8868\u793a\u9810\u7559 6 \u500b\u5b57\u5143\u5bec\u5ea6\uff0c\u7531\u65bc\u9810\u7559\u4e86 6 \u500b\u5b57\u5143\u5bec\u5ea6\uff0c\u4e0d\u8db3\u7684\u90e8\u4efd\u8981\u7531\u7a7a\u767d\u5b57\u5143\u88dc\u4e0a\uff0c\u6240\u4ee5\u57f7\u884c\u7d50\u679c\u6703\u8f38\u51fa\u5982\u4e0b\uff0819.23\u53ea\u4f54\u4e94\u500b\u5b57\u5143\uff0c\u6240\u4ee5\u88dc\u4e0a\u4e00\u500b\u7a7a\u767d\u5728\u524d\u7aef\uff09\uff1a<\/p>\n\n\n\n
example: 19.23<\/code><\/pre>\n\n\n\n
\u82e5\u5728 %<\/code> \u4e4b\u5f8c\u6307\u5b9a\u8ca0\u865f\uff0c\u4f8b\u5982 %-6.2f<\/code>\uff0c\u5247\u8868\u793a\u9760\u5de6\u5c0d\u9f4a\uff0c\u6c92\u6709\u6307\u5b9a\u5247\u9760\u53f3\u5c0d\u9f4a\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
#include <stdio.h>\n\nint main(void) {\n    printf(\"example:%6.2f\\n\", 19.234);\n    printf(\"example:%-6.2f\\n\", 19.234);\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u986f\u793a\u7d50\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
example: 19.23\nexample:19.23<\/code><\/pre>\n\n\n\n
\"IT\u96fb\u8166\u88dc\u7fd2,<\/figure>\n\n\n
<\/p>","protected":false},"excerpt":{"rendered":"
\u5728C\u8bed\u8a00\u4e2d\u662f\u7528printf\u51fd\u6570\u8fdb\u884c\u8f93\u51fa\uff0c\u7528scan […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":30,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"printf() \u8207 scanf() - ITTeacherITFreelance.hk","description":"\u5728C\u8bed\u8a00\u4e2d\u662f\u7528printf\u51fd\u6570\u8fdb\u884c\u8f93\u51fa\uff0c\u7528scanf\u51fd\u6570\u8fdb\u884c\u8f93\u5165\u7684\u3002C++\u4fdd\u7559\u4e86C\u8bed\u8a00\u7684\u8fd9\u4e00\u7528\u6cd5\uff0c\u5728\u6b64\u53ea\u4f5c\u5f88\u7b80\u5355\u7684\u4ecb\u7ecd\u3002\u66f4\u591a\u5185\u5bb9\u8bf7\u67e5\u770b\uff1a scanf\u51fd\u6570\u4e00\u822c\u683c\u5f0f\u662f\uff1a     scanf(\u683c\u5f0f\u63a7\u5236, \u8f93\u51fa\u8868\u5217) \u3010\u4f8b\u3011\u7528scanf\u548cprintf\u51fd\u6570\u8fdb\u884c\u8f93\u5165\u548c\u8f93\u51fa\u3002 \u8fd0\u884c\u60c5\u51b5\u5982\u4e0b: 12 A"},"footnotes":""},"categories":[1306],"tags":[],"_links":{"self":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/2571"}],"collection":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=2571"}],"version-history":[{"count":2,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/2571\/revisions"}],"predecessor-version":[{"id":12860,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/2571\/revisions\/12860"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/media\/30"}],"wp:attachment":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=2571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=2571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=2571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}