{"id":74655,"date":"2024-02-27T13:49:33","date_gmt":"2024-02-27T05:49:33","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=74655"},"modified":"2024-02-27T13:49:47","modified_gmt":"2024-02-27T05:49:47","slug":"c%e8%af%ad%e8%a8%80%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e6%9d%a1%e4%bb%b6%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/74655.html","title":{"rendered":"C\u8bed\u8a00\u4e2d\u5982\u4f55\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5"},"content":{"rendered":"

\"C\u8bed\u8a00\u4e2d\u5982\u4f55\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\"<\/p>\n

\u5728C\u8bed\u8a00\u4e2d\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u662f\u4e00\u4e2a\u57fa\u672c\u7684\u7f16\u7a0b\u6280\u80fd\uff0c\u5b83\u5141\u8bb8\u7a0b\u5e8f\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5206\u652f\u3002C\u8bed\u8a00\u63d0\u4f9b\u4e86\u51e0\u79cd\u6761\u4ef6\u8bed\u53e5\uff0c\u4f8b\u5982if\u8bed\u53e5\u3001else\u8bed\u53e5\u3001else if\u8bed\u53e5\u4ee5\u53caswitch\u8bed\u53e5<\/strong>\u3002\u5176\u4e2dif\u8bed\u53e5<\/strong>\u53ef\u80fd\u662f\u6700\u5e38\u89c1\u7684\u6761\u4ef6\u8bed\u53e5\u3002\u5b83\u6839\u636e\u7ed9\u5b9a\u6761\u4ef6\u662f\u5426\u4e3a\u771f\u6765\u63a7\u5236\u7a0b\u5e8f\u6d41\uff0c\u7136\u540e\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002\u5728\u8be6\u7ec6\u63cf\u8ff0\u90e8\u5206\uff0c\u6211\u4eec\u4f1a\u9996\u5148\u6df1\u5165\u63a2\u8ba8if\u8bed\u53e5\u3002<\/p>\n

IF\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/strong>\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

“`c<\/p>\n

if (\u6761\u4ef6) {<\/p>\n

\/\/ \u6761\u4ef6\u4e3a\u771f\u65f6\u6267\u884c\u7684\u8bed\u53e5<\/p>\n

}<\/p>\n

“`<\/p>\n

\u5982\u679c\u6761\u4ef6\u4e3a\u771f\uff0c\u5219\u6267\u884c\u5927\u62ec\u53f7\u5185\u7684\u8bed\u53e5\u3002\u5982\u679c\u6761\u4ef6\u4e3a\u5047\uff0c\u5219\u8df3\u8fc7\u5927\u62ec\u53f7\u5185\u7684\u8bed\u53e5\u3002IF\u8bed\u53e5\u53ef\u4ee5\u4e0eELSE\u548cELSE IF\u8bed\u53e5\u7ed3\u5408\u4f7f\u7528\uff0c\u5f62\u6210\u66f4\u4e3a\u590d\u6742\u7684\u6761\u4ef6\u5224\u65ad\u903b\u8f91\u3002<\/p>\n

\u4e00\u3001IF\u8bed\u53e5<\/strong><\/h2>\n

If\u8bed\u53e5\u5141\u8bb8\u6211\u4eec\u57fa\u4e8e\u4e00\u4e2a\u6761\u4ef6\u6765\u6267\u884c\u7279\u5b9a\u7684\u4ee3\u7801\u5757\u3002\u5982\u679c\u6761\u4ef6\u8bc4\u4f30\u4e3a\u771f\uff08\u975e\u96f6\uff09\uff0c\u5219\u4ee3\u7801\u5757\u5c06\u88ab\u6267\u884c\u3002<\/p>\n

*\u57fa\u672c\u5f62\u5f0f*<\/p>\n

if\u8bed\u53e5\u7684\u6700\u7b80\u5f62\u5f0f\u4ec5\u5305\u62ec\u4e00\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\uff1a<\/p>\n

“`c<\/p>\n

if (expression) {<\/p>\n

\/\/ \u5f53expression\u4e3a\u771f\uff08\u975e\u96f6\uff09\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

}<\/p>\n

“`<\/p>\n

\u8fd9\u79cd\u5f62\u5f0f\u975e\u5e38\u9002\u5408\u5bf9\u5355\u4e00\u6761\u4ef6\u8fdb\u884c\u5feb\u901f\u68c0\u67e5\u3002\u7136\u800c\uff0c\u5728\u73b0\u5b9e\u4e16\u754c\u7684\u7f16\u7a0b\u4efb\u52a1\u4e2d\uff0c\u6211\u4eec\u5f80\u5f80\u9700\u8981\u5904\u7406\u66f4\u590d\u6742\u7684\u60c5\u51b5\u3002<\/p>\n

*\u5e94\u7528\u5b9e\u4f8b*<\/p>\n

\u4f8b\u5982\uff0c\u68c0\u6d4b\u4e00\u4e2a\u6574\u6570\u662f\u5426\u4e3a\u6b63\u6570\uff1a<\/p>\n

“`c<\/p>\n

int number = 10;<\/p>\n

if (number > 0) {<\/p>\n

printf(“The number is positive.\\n”);<\/p>\n

}<\/p>\n

“`<\/p>\n

\u4e8c\u3001IF…ELSE\u8bed\u53e5<\/strong><\/h2>\n

\u5982\u679c\u6211\u4eec\u60f3\u8981\u5728\u6761\u4ef6\u4e3a\u5047\u65f6\u4e5f\u6267\u884c\u67d0\u6bb5\u4ee3\u7801\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528if…else\u8bed\u53e5\u3002<\/p>\n

*\u57fa\u672c\u5f62\u5f0f*<\/p>\n

if…else\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

“`c<\/p>\n

if (expression) {<\/p>\n

\/\/ \u5f53expression\u4e3a\u771f\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

} else {<\/p>\n

\/\/ \u5f53expression\u4e3a\u5047\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

}<\/p>\n

“`<\/p>\n

*\u5e94\u7528\u5b9e\u4f8b*<\/p>\n

\u4f8b\u5982\uff0c\u68c0\u67e5\u4e00\u4e2a\u6570\u662f\u6b63\u6570\u8fd8\u662f\u975e\u6b63\u6570\uff1a<\/p>\n

“`c<\/p>\n

int number = -10;<\/p>\n

if (number > 0) {<\/p>\n

printf(“The number is positive.\\n”);<\/p>\n

} else {<\/p>\n

printf(“The number is not positive.\\n”);<\/p>\n

}<\/p>\n

“`<\/p>\n

\u4e09\u3001IF…ELSE IF…ELSE\u8bed\u53e5<\/strong><\/h2>\n

\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u6839\u636e\u591a\u4e2a\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\uff0c\u8fd9\u65f6\u53ef\u4ee5\u4f7f\u7528if…else if…else\u7ed3\u6784\u3002<\/p>\n

*\u57fa\u672c\u5f62\u5f0f*<\/p>\n

“`c<\/p>\n

if (expression1) {<\/p>\n

\/\/ \u5f53expression1\u4e3a\u771f\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

} else if (expression2) {<\/p>\n

\/\/ \u5f53expression2\u4e3a\u771f\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

} else {<\/p>\n

\/\/ \u5f53\u4e0a\u8ff0\u6761\u4ef6\u90fd\u4e0d\u4e3a\u771f\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

}<\/p>\n

“`<\/p>\n

*\u5e94\u7528\u5b9e\u4f8b*<\/p>\n

\u4f8b\u5982\uff0c\u5bf9\u6210\u7ee9\u8fdb\u884c\u8bc4\u7ea7\uff1a<\/p>\n

“`c<\/p>\n

int score = 75;<\/p>\n

if (score >= 90) {<\/p>\n

printf(“Grade A\\n”);<\/p>\n

} else if (score >= 80) {<\/p>\n

printf(“Grade B\\n”);<\/p>\n

} else if (score >= 70) {<\/p>\n

printf(“Grade C\\n”);<\/p>\n

} else if (score >= 60) {<\/p>\n

printf(“Grade D\\n”);<\/p>\n

} else {<\/p>\n

printf(“Grade F\\n”);<\/p>\n

}<\/p>\n

“`<\/p>\n

\u56db\u3001SWITCH\u8bed\u53e5<\/strong><\/h2>\n

\u5728\u9700\u8981\u5bf9\u4e00\u4e2a\u53d8\u91cf\u8fdb\u884c\u591a\u79cd\u60c5\u51b5\u7684\u68c0\u67e5\u65f6\uff0c\u4f7f\u7528switch\u8bed\u53e5\u901a\u5e38\u6bd4\u591a\u4e2aif…else if\u8bed\u53e5\u66f4\u52a0\u6e05\u6670\u548c\u7b80\u6d01\u3002<\/p>\n

*\u57fa\u672c\u5f62\u5f0f*<\/p>\n

switch\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

“`c<\/p>\n

switch (expression) {<\/p>\n

case constant1:<\/p>\n

\/\/ \u5f53expression\u7b49\u4e8econstant1\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

break;<\/p>\n

case constant2:<\/p>\n

\/\/ \u5f53expression\u7b49\u4e8econstant2\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

break;<\/p>\n

\/\/ \u66f4\u591a\u7684case\u5206\u652f…<\/p>\n

default:<\/p>\n

\/\/ \u5f53\u6ca1\u6709\u4efb\u4f55case\u5339\u914d\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/p>\n

}<\/p>\n

“`<\/p>\n

*\u5e94\u7528\u5b9e\u4f8b*<\/p>\n

\u4f8b\u5982\uff0c\u4e3a\u661f\u671f\u6bcf\u5929\u5206\u914d\u4ee3\u53f7\uff1a<\/p>\n

“`c<\/p>\n

int day = 4;<\/p>\n

switch (day) {<\/p>\n

case 1:<\/p>\n

printf(“Monday\\n”);<\/p>\n

break;<\/p>\n

case 2:<\/p>\n

printf(“Tuesday\\n”);<\/p>\n

break;<\/p>\n

case 3:<\/p>\n

printf(“Wednesday\\n”);<\/p>\n

break;<\/p>\n

case 4:<\/p>\n

printf(“Thursday\\n”);<\/p>\n

break;<\/p>\n

case 5:<\/p>\n

printf(“Friday\\n”);<\/p>\n

break;<\/p>\n

case 6:<\/p>\n

printf(“Saturday\\n”);<\/p>\n

break;<\/p>\n

case 7:<\/p>\n

printf(“Sunday\\n”);<\/p>\n

break;<\/p>\n

default:<\/p>\n

printf(“Invalid day\\n”);<\/p>\n

}<\/p>\n

“`<\/p>\n

\u5728\u8fd9\u91cc\uff0cSwitch\u8bed\u53e5\u6e05\u6670\u5730\u5c55\u793a\u4e867\u79cd\u4e0d\u540c\u7684\u60c5\u51b5\u5904\u7406\uff0c\u4f7f\u4ee3\u7801\u6613\u4e8e\u7406\u89e3\u3002\u6bcf\u4e2acase\u540e\u9762\u7684break\u8bed\u53e5\u662f\u81f3\u5173\u91cd\u8981\u7684\uff0c\u56e0\u4e3a\u5b83\u963b\u6b62\u4e86\u4ee3\u7801\u843d\u5165\u4e0b\u4e00\u4e2acase\u4e2d\uff0c\u8fd9\u88ab\u79f0\u4e3a\u201c\u7a7f\u900f\u201d\u3002<\/p>\n

\u5728\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u65f6\uff0c\u4e86\u89e3\u6d41\u7a0b\u63a7\u5236\u548c\u903b\u8f91\u8fd0\u7b97<\/strong>\u4e5f\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u56e0\u4e3a\u8fd9\u80fd\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7f16\u5199\u548c\u7406\u89e3\u6761\u4ef6\u8bed\u53e5\u3002\u800c\u5728\u7f16\u7a0b\u5b9e\u8df5\u4e2d\uff0c\u5408\u7406\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u53ef\u4ee5\u4f7f\u6211\u4eec\u7684\u4ee3\u7801\u66f4\u52a0\u9ad8\u6548\u3001\u6613\u4e8e\u7ef4\u62a4\u548c\u6269\u5c55\u3002<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

\u5982\u4f55\u5728C\u8bed\u8a00\u4e2d\u4f7f\u7528if\u8bed\u53e5\uff1f<\/strong><\/p>\n

\u5728C\u8bed\u8a00\u4e2d\uff0cif\u8bed\u53e5\u7528\u4e8e\u5728\u7a0b\u5e8f\u4e2d\u6267\u884c\u6761\u4ef6\u6027\u7684\u8bed\u53e5\u5757\u3002\u5176\u57fa\u672c\u8bed\u6cd5\u7ed3\u6784\u4e3a\uff1a
\n“`c
\nif (\u6761\u4ef6\u8868\u8fbe\u5f0f) {
\n \/\/ \u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3a\u771f\uff0c\u6267\u884c\u8fd9\u91cc\u7684\u8bed\u53e5
\n}
\n“`<\/p>\n

\u5982\u4f55\u5728C\u8bed\u8a00\u4e2d\u4f7f\u7528else\u8bed\u53e5\uff1f<\/strong><\/p>\n

\u5728C\u8bed\u8a00\u4e2d\uff0celse\u8bed\u53e5\u901a\u5e38\u4e0eif\u8bed\u53e5\u8fde\u7528\uff0c\u7528\u4e8e\u5f53if\u6761\u4ef6\u4e0d\u6210\u7acb\u65f6\u6267\u884c\u53e6\u4e00\u6bb5\u4ee3\u7801\u3002\u57fa\u672c\u8bed\u6cd5\u4e3a\uff1a
\n“`c
\nif (\u6761\u4ef6\u8868\u8fbe\u5f0f) {
\n \/\/ \u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3a\u771f\uff0c\u6267\u884c\u8fd9\u91cc\u7684\u8bed\u53e5
\n} else {
\n \/\/ \u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3a\u5047\uff0c\u6267\u884c\u8fd9\u91cc\u7684\u8bed\u53e5
\n}
\n“`<\/p>\n

C\u8bed\u8a00\u4e2dswitch\u8bed\u53e5\u7684\u4f7f\u7528\u65b9\u5f0f\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n

\u5728C\u8bed\u8a00\u4e2d\uff0cswitch\u8bed\u53e5\u7528\u4e8e\u591a\u4e2a\u6761\u4ef6\u4e0b\u7684\u5206\u652f\u9009\u62e9\u3002\u5176\u57fa\u672c\u8bed\u6cd5\u7ed3\u6784\u4e3a\uff1a
\n“`c
\nswitch (\u8868\u8fbe\u5f0f) {
\n case \u503c1:
\n \/\/ \u5f53\u8868\u8fbe\u5f0f\u7b49\u4e8e\u503c1\u65f6\u6267\u884c\u8fd9\u91cc\u7684\u8bed\u53e5
\n break;
\n case \u503c2:
\n \/\/ \u5f53\u8868\u8fbe\u5f0f\u7b49\u4e8e\u503c2\u65f6\u6267\u884c\u8fd9\u91cc\u7684\u8bed\u53e5
\n break;
\n default:
\n \/\/ \u5982\u679c\u8868\u8fbe\u5f0f\u7684\u503c\u4e0d\u5339\u914d\u4efb\u4f55case\u65f6\u6267\u884c\u8fd9\u91cc\u7684\u8bed\u53e5
\n}
\n“`<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728C\u8bed\u8a00\u4e2d\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u662f\u4e00\u4e2a\u57fa\u672c\u7684\u7f16\u7a0b\u6280\u80fd\uff0c\u5b83\u5141\u8bb8\u7a0b\u5e8f\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5206\u652f\u3002C\u8bed\u8a00\u63d0\u4f9b\u4e86\u51e0\u79cd\u6761\u4ef6\u8bed\u53e5 […]","protected":false},"author":1,"featured_media":74658,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/74655"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=74655"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/74655\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/74658"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=74655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=74655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=74655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}