{"id":3283,"date":"2025-03-29T15:10:28","date_gmt":"2025-03-29T07:10:28","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3283"},"modified":"2025-03-29T15:10:28","modified_gmt":"2025-03-29T07:10:28","slug":"c-%e5%9f%ba%e6%9c%ac%e7%9a%84%e8%be%93%e5%85%a5%e8%be%93%e5%87%ba","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/29\/c-%e5%9f%ba%e6%9c%ac%e7%9a%84%e8%be%93%e5%85%a5%e8%be%93%e5%87%ba\/","title":{"rendered":"C++ \u57fa\u672c\u7684\u8f93\u5165\u8f93\u51fa"},"content":{"rendered":"\n

C++ \u7684\u8f93\u5165\u8f93\u51fa\u4e3b\u8981\u4f9d\u8d56\u4e8e \u6807\u51c6\u8f93\u5165\u8f93\u51fa\u6d41\u5e93 <iostream><\/code><\/strong>\u3002\u5b83\u63d0\u4f9b\u4e86 cin<\/code>\uff08\u8f93\u5165\uff09\u3001cout<\/code>\uff08\u8f93\u51fa\uff09\u3001cerr<\/code>\uff08\u9519\u8bef\u8f93\u51fa\uff09\u548c clog<\/code>\uff08\u65e5\u5fd7\u8f93\u51fa\uff09<\/strong>\uff0c\u7528\u4e8e\u63a7\u5236\u53f0\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\n\n\n\n

1. cout<\/code> \u6807\u51c6\u8f93\u51fa<\/strong><\/h2>\n\n\n\n

cout<\/code>\uff08Console Output\uff09\u7528\u4e8e\u5411\u6807\u51c6\u8f93\u51fa\uff08\u63a7\u5236\u53f0\uff09\u6253\u5370\u6570\u636e\u3002<\/p>\n\n\n\n

1.1 \u8f93\u51fa\u57fa\u672c\u6570\u636e<\/strong><\/h3>\n\n\n\n
#include <iostream>\n\nint main() {\n    std::cout << \"Hello, C++!\" << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n
    \n
  • std::cout<\/code>\uff1a\u7528\u4e8e\u8f93\u51fa\u6587\u672c\u6216\u53d8\u91cf\u5230\u63a7\u5236\u53f0\u3002<\/li>\n\n\n\n
  • <<<\/code>\uff08\u6d41\u63d2\u5165\u8fd0\u7b97\u7b26\uff09\uff1a\u7528\u4e8e\u8fde\u63a5 cout<\/code> \u548c\u8981\u8f93\u51fa\u7684\u5185\u5bb9\u3002<\/li>\n\n\n\n
  • std::endl<\/code>\uff1a\u6362\u884c\uff08\u7b49\u6548\u4e8e \"\\n\"<\/code>\uff09\uff0c\u540c\u65f6\u4f1a\u5237\u65b0\u8f93\u51fa\u7f13\u51b2\u533a\u3002<\/li>\n<\/ul>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    Hello, C++!<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    1.2 \u8f93\u51fa\u591a\u4e2a\u53d8\u91cf<\/strong><\/h3>\n\n\n\n
    #include <iostream>\n\nint main() {\n    int a = 10;\n    double b = 3.14;\n    std::cout << \"a = \" << a << \", b = \" << b << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    a = 10, b = 3.14<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    2. cin<\/code> \u6807\u51c6\u8f93\u5165<\/strong><\/h2>\n\n\n\n
    cin<\/code>\uff08Console Input\uff09\u7528\u4e8e\u4ece\u6807\u51c6\u8f93\u5165\uff08\u952e\u76d8\uff09\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n\n\n\n
    2.1 \u8bfb\u53d6\u5355\u4e2a\u53d8\u91cf<\/strong><\/h3>\n\n\n\n
    #include <iostream>\n\nint main() {\n    int age;\n    std::cout << \"\u8bf7\u8f93\u5165\u4f60\u7684\u5e74\u9f84: \";\n    std::cin >> age;\n    std::cout << \"\u4f60\u7684\u5e74\u9f84\u662f: \" << age << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u5165\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    \u8bf7\u8f93\u5165\u4f60\u7684\u5e74\u9f84: 25<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    \u4f60\u7684\u5e74\u9f84\u662f: 25<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    2.2 \u8bfb\u53d6\u591a\u4e2a\u53d8\u91cf<\/strong><\/h3>\n\n\n\n
    #include <iostream>\n\nint main() {\n    int x;\n    double y;\n    std::cout << \"\u8bf7\u8f93\u5165\u6574\u6570\u548c\u5c0f\u6570\uff08\u7528\u7a7a\u683c\u5206\u9694\uff09: \";\n    std::cin >> x >> y;\n    std::cout << \"\u4f60\u8f93\u5165\u7684\u6574\u6570: \" << x << \", \u5c0f\u6570: \" << y << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u5165\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    \u8bf7\u8f93\u5165\u6574\u6570\u548c\u5c0f\u6570\uff08\u7528\u7a7a\u683c\u5206\u9694\uff09: 10 5.67<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    \u4f60\u8f93\u5165\u7684\u6574\u6570: 10, \u5c0f\u6570: 5.67<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    3. cerr<\/code> \u9519\u8bef\u8f93\u51fa<\/strong><\/h2>\n\n\n\n
    cerr<\/code>\uff08Console Error\uff09\u7528\u4e8e\u8f93\u51fa\u9519\u8bef\u4fe1\u606f\uff0c\u4e0d\u4f1a\u88ab\u7f13\u51b2\uff08\u5373\u65f6\u8f93\u51fa\uff09\u3002<\/p>\n\n\n\n
    #include <iostream>\n\nint main() {\n    std::cerr << \"\u53d1\u751f\u9519\u8bef: \u65e0\u6548\u8f93\u5165!\" << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff08\u5230\u6807\u51c6\u9519\u8bef\u6d41\uff09\uff1a<\/strong><\/p>\n\n\n\n
    \u53d1\u751f\u9519\u8bef: \u65e0\u6548\u8f93\u5165!<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    4. clog<\/code> \u65e5\u5fd7\u8f93\u51fa<\/strong><\/h2>\n\n\n\n
    clog<\/code>\uff08Console Log\uff09\u7528\u4e8e\u8f93\u51fa\u65e5\u5fd7\u4fe1\u606f\uff0c\u662f\u7f13\u51b2\u8f93\u51fa<\/strong>\uff08\u4e0d\u4f1a\u7acb\u5373\u5237\u65b0\uff09\u3002<\/p>\n\n\n\n
    #include <iostream>\n\nint main() {\n    std::clog << \"\u65e5\u5fd7\u4fe1\u606f: \u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c...\" << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff08\u5230\u6807\u51c6\u65e5\u5fd7\u6d41\uff09\uff1a<\/strong><\/p>\n\n\n\n
    \u65e5\u5fd7\u4fe1\u606f: \u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c...<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    5. \u5904\u7406\u5b57\u7b26\u4e32\u8f93\u5165<\/strong><\/h2>\n\n\n\n
    5.1 cin<\/code> \u8bfb\u53d6\u5355\u8bcd<\/strong><\/h3>\n\n\n\n
    cin<\/code> \u53ea\u4f1a\u8bfb\u53d6\u7b2c\u4e00\u4e2a\u7a7a\u683c\u524d\u7684\u5b57\u7b26<\/strong>\uff1a<\/p>\n\n\n\n
    #include <iostream>\n\nint main() {\n    std::string name;\n    std::cout << \"\u8bf7\u8f93\u5165\u4f60\u7684\u540d\u5b57: \";\n    std::cin >> name;\n    std::cout << \"\u4f60\u597d, \" << name << \"!\" << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u5165\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    \u8bf7\u8f93\u5165\u4f60\u7684\u540d\u5b57: \u5f20\u4e09 \u674e\u56db<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    \u4f60\u597d, \u5f20\u4e09!<\/code><\/pre>\n\n\n\n
    \n
    \u6ce8\u610f\uff1a<\/strong> \"\u674e\u56db\"<\/code> \u88ab\u5ffd\u7565\uff0c\u56e0\u4e3a cin<\/code> \u9047\u5230\u7a7a\u683c\u4f1a\u505c\u6b62\u8bfb\u53d6\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n\n\n\n
    5.2 getline()<\/code> \u8bfb\u53d6\u6574\u884c<\/strong><\/h3>\n\n\n\n
    \u5982\u679c\u9700\u8981\u8bfb\u53d6\u5305\u542b\u7a7a\u683c\u7684\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528 getline()<\/code>\uff1a<\/p>\n\n\n\n
    #include <iostream>\n#include <string>\n\nint main() {\n    std::string fullName;\n    std::cout << \"\u8bf7\u8f93\u5165\u4f60\u7684\u5168\u540d: \";\n    std::getline(std::cin, fullName);\n    std::cout << \"\u4f60\u597d, \" << fullName << \"!\" << std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u5165\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    \u8bf7\u8f93\u5165\u4f60\u7684\u5168\u540d: \u5f20\u4e09 \u674e\u56db<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    \u4f60\u597d, \u5f20\u4e09 \u674e\u56db!<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    6. \u683c\u5f0f\u5316\u8f93\u51fa\uff08setw<\/code>\u3001setprecision<\/code>\uff09<\/strong><\/h2>\n\n\n\n
    C++ \u63d0\u4f9b <iomanip><\/code> \u5934\u6587\u4ef6\u7528\u4e8e\u683c\u5f0f\u5316\u8f93\u51fa\u3002<\/p>\n\n\n\n
    #include <iostream>\n#include <iomanip>\n\nint main() {\n    double pi = 3.1415926535;\n\n    std::cout << \"\u9ed8\u8ba4\u8f93\u51fa: \" << pi << std::endl;\n    std::cout << \"\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570: \" << std::fixed << std::setprecision(2) << pi << std::endl;\n    std::cout << \"\u5b57\u6bb5\u5bbd\u5ea6 10: \" << std::setw(10) << pi << std::endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    \u9ed8\u8ba4\u8f93\u51fa: 3.14159\n\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570: 3.14\n\u5b57\u6bb5\u5bbd\u5ea6 10:       3.14<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    7. \u5904\u7406\u8f93\u5165\u5931\u8d25\uff08cin.fail()<\/code>\uff09<\/strong><\/h2>\n\n\n\n
    \u5982\u679c\u7528\u6237\u8f93\u5165\u9519\u8bef\u7684\u6570\u636e\u7c7b\u578b\uff0ccin<\/code> \u4f1a\u8fdb\u5165\u9519\u8bef\u72b6\u6001\uff0c\u53ef\u4ee5\u7528 cin.fail()<\/code> \u68c0\u6d4b\uff1a<\/p>\n\n\n\n
    #include <iostream>\n\nint main() {\n    int number;\n    std::cout << \"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570: \";\n    std::cin >> number;\n\n    if (std::cin.fail()) {\n        std::cin.clear();  \/\/ \u6e05\u9664\u9519\u8bef\u72b6\u6001\n        std::cin.ignore(100, '\\n');  \/\/ \u5ffd\u7565\u9519\u8bef\u8f93\u5165\n        std::cout << \"\u8f93\u5165\u65e0\u6548\uff0c\u8bf7\u8f93\u5165\u6574\u6570!\" << std::endl;\n    } else {\n        std::cout << \"\u4f60\u8f93\u5165\u7684\u6574\u6570\u662f: \" << number << std::endl;\n    }\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u5165\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    \u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570: abc<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    \u8f93\u5165\u65e0\u6548\uff0c\u8bf7\u8f93\u5165\u6574\u6570!<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u603b\u7ed3<\/strong><\/h2>\n\n\n\n
    \u64cd\u4f5c<\/strong><\/th>\u7528\u6cd5<\/strong><\/th><\/tr><\/thead>
    std::cout <<<\/code><\/td>\u6807\u51c6\u8f93\u51fa<\/td><\/tr>
    std::cin >><\/code><\/td>\u6807\u51c6\u8f93\u5165<\/td><\/tr>
    std::cerr <<<\/code><\/td>\u9519\u8bef\u8f93\u51fa\uff08\u4e0d\u7f13\u51b2\uff09<\/td><\/tr>
    std::clog <<<\/code><\/td>\u65e5\u5fd7\u8f93\u51fa\uff08\u7f13\u51b2\uff09<\/td><\/tr>
    std::getline(cin, str)<\/code><\/td>\u8bfb\u53d6\u4e00\u6574\u884c\uff08\u5305\u542b\u7a7a\u683c\uff09<\/td><\/tr>
    std::setw(n)<\/code><\/td>\u8bbe\u5b9a\u5b57\u6bb5\u5bbd\u5ea6<\/td><\/tr>
    std::setprecision(n)<\/code><\/td>\u8bbe\u7f6e\u5c0f\u6570\u7cbe\u5ea6<\/td><\/tr>
    std::cin.fail()<\/code><\/td>\u68c0\u6d4b\u8f93\u5165\u5931\u8d25<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    C++ \u7684\u8f93\u5165\u8f93\u51fa\u4e3b\u8981\u4f9d\u8d56\u4e8e \u6807\u51c6\u8f93\u5165\u8f93\u51fa\u6d41\u5e93 <iostream>\u3002\u5b83\u63d0\u4f9b\u4e86 cin\uff08\u8f93\u5165\uff09\u3001cout […]<\/p>\n","protected":false},"author":1,"featured_media":3284,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"class_list":["post-3283","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3283","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3283"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3283\/revisions"}],"predecessor-version":[{"id":3285,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3283\/revisions\/3285"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3284"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}