{"id":9187,"date":"2026-04-16T08:30:00","date_gmt":"2026-04-15T23:30:00","guid":{"rendered":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/?page_id=9187"},"modified":"2026-04-11T19:36:01","modified_gmt":"2026-04-11T10:36:01","slug":"ex0205a","status":"publish","type":"page","link":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/lecture\/prog\/exercise-advance\/ex02\/ex0205a\/","title":{"rendered":"\u8ab2\u984c [2] if \u6587\uff085\/9\uff09"},"content":{"rendered":"<div class=\"breadcrumbs align  wp-block-bcn-breadcrumb-trail has-text-color has-background\" vocab=\"https:\/\/schema.org\/\" typeof=\"BreadcrumbList\">\n\t<span><\/span>\n\t<span property=\"itemListElement\" typeof=\"ListItem\"><a property=\"item\" typeof=\"WebPage\" title=\"Go to \u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u5de5\u5b66\u7814\u7a76\u5ba4.\" href=\"https:\/\/se.cite.ehime-u.ac.jp\/jp\" class=\"home\" aria-current=\"page\"><span property=\"name\">\u30db\u30fc\u30e0<\/span><\/a><meta property=\"position\" content=\"1\"><\/span><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-background\" style=\"background-color:#d3f28c\"><strong>\u554f 5<\/strong>\uff08\u63d0\u51fa\u30d7\u30ed\u30b0\u30e9\u30e0\u540d\uff1aex0205a.c\uff09<\/h4>\n\n\n\n<p class=\"problem\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">\u6b21\u306e\u624b\u9806\u306b\u5f93\u3063\u3066<\/mark><\/strong> <strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0000ff\" class=\"has-inline-color\">2 \u3064\u306e\u6574\u6570\u3067\u4f5c\u3089\u308c\u308b\u5206\u6570<\/mark><\/strong>\u3092\u51fa\u529b\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u306a\u3055\u3044\uff0e<br>\u305f\u3060\u3057\uff0c<strong>\u7d04\u5206\u306f\u8003\u3048\u306a\u304f\u3066\u3088\u3044<\/strong>\uff0e<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-red-color\">\u8868\u793a\u306e\u3055\u305b\u65b9\u306f\u5b9f\u884c\u4f8b\u306e\u901a\u308a<\/mark><\/strong>\u3068\u3059\u308b\uff0e<br>\u63d0\u51fa\u3059\u308b\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\uff08\u30bd\u30fc\u30b9\u30d7\u30ed\u30b0\u30e9\u30e0\uff09\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u306f <strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#008800\" class=\"has-inline-color\">ex0205a.c<\/mark><\/strong> \u3068\u3057\u306a\u3055\u3044\uff0e<br><br><strong>\u3010\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3057\u3066\u5b9f\u73fe\u3059\u308b\u51e6\u7406\u624b\u9806\u3011<\/strong><br><strong><mark style=\"background-color:#fff6af\" class=\"has-inline-color\">\u5fc5\u305a\u3053\u308c\u306b\u5f93\u3046\u3053\u3068\uff0e\u5f93\u3063\u3066\u3044\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\uff08\u305f\u3068\u3048\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u3066\u3082\uff09\u3059\u3079\u3066\u4e0d\u6b63\u89e3\u3068\u307f\u306a\u3059\uff0e<\/mark><\/strong><br>(1) 2 \u3064\u306e\u6574\u6570 <kbd>x<\/kbd> \u3068 <kbd>y<\/kbd> \u3092\u8aad\u307f\u8fbc\u3080\uff0e<br>(2) \u3082\u3057 <kbd>y == 0<\/kbd> \u306a\u3089\u3070\u300c<strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0000ff\" class=\"has-inline-color\">\u8868\u793a\u3067\u304d\u307e\u305b\u3093<\/mark><\/strong>\u300d\u3068\u51fa\u529b\u3059\u308b\uff0e<br>\u3000 \u305d\u3046\u3067\u306a\u3044\u306a\u3089\u3070\u4ee5\u4e0b\u306e(2-1)\uff0c(2-2) \u3092\u5b9f\u884c\u3059\u308b\uff1a<br>\u3000\u3000(2-1)<strong>\u3082\u3057 <kbd>y &lt; 0<\/kbd> \u306a\u3089\u3070\uff0c\u305d\u306e\u6642\u3060\u3051\u306f <mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\"><kbd>x = -x<\/kbd> \u3068 <kbd>y = -y<\/kbd> \u3092\u5b9f\u884c<\/mark><\/strong>\u3059\u308b\uff0e<br>\u3000\u3000\u3000\uff08\u305d\u3046\u3067\u306a\u3044\u6642\u306f\u4f55\u3082\u3057\u306a\u3044\uff0e<br>\u3000\u3000\u3000\u3000\u3064\u307e\u308a\uff0c\u3053\u306e\u624b\u9806(2-1) \u306b\u5bfe\u5fdc\u3059\u308b if \u6587\u3067\u306f else \u90e8\u306f\u4e0d\u8981\u3067\u3042\u308b\uff0e\uff09<br>\u3000\u3000(2-2) <kbd>x<\/kbd> \u3068 <kbd>y<\/kbd> \u3092<strong><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0000ff\" class=\"has-inline-color\">\u300c<kbd>x\/y<\/kbd>\u300d\u306e\u304b\u305f\u3061\uff08\u30b9\u30e9\u30c3\u30b7\u30e5\u300c <kbd>\/<\/kbd> \u300d\u3092\u631f\u3080\u304b\u305f\u3061\uff09\u3067<\/mark><\/strong>\u51fa\u529b\u3059\u308b\uff0e<\/p>\n\n\n\n<p class=\"hint\"><strong>\u3010\u88dc\u8db3\u8aac\u660e\u3011<\/strong>\u4e0a\u306e\u624b\u9806(2-1)\u3067\u3084\u3063\u3066\u3044\u308b\u5185\u5bb9\uff1a<br><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">\u5206\u6bcd\u3068\u3057\u3066\u8868\u793a\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u6574\u6570 <kbd>y<\/kbd> \u304c\u8ca0\u306e\u6570\u306e\u5834\u5408<\/mark>\uff0c<strong>\u305d\u306e\u307e\u307e\u8868\u793a\u3059\u308b\u3068\u30de\u30a4\u30ca\u30b9\u304c\u4ed8\u3044\u3066\u3057\u307e\u3046<\/strong>\u306e\u3067\uff0c<strong>\u5206\u5b50\u3068\u5206\u6bcd\u306e\u4e21\u65b9\u306b -1 \u3092\u304b\u3051\u308b<\/strong>\u3053\u3068\u3067<mark style=\"background-color:rgba(0, 0, 0, 0);color:#ff0000\" class=\"has-inline-color\">\u5206\u6bcd\u304c\u5fc5\u305a\u6b63\u306e\u6570\u306b\u306a\u308b\u3088\u3046\u8abf\u6574<\/mark>\u3057\u3066\u3044\u307e\u3059\uff0e<\/mark><\/p>\n\n\n\n<p class=\"hint\">\u3010\u30d2\u30f3\u30c8\u3011<br>\u4e0a\u306e\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u69cb\u9020\u306b\u306a\u308a\u307e\u3059\uff1a<br><br><kbd>\u3000if ( y == 0 )<\/kbd><br>\u3000<kbd>{<\/kbd><br>\u3000\u3000\u3000<kbd>\u300c\u8868\u793a\u3067\u304d\u307e\u305b\u3093\u300d\u3068\u51fa\u529b\uff08\u672b\u5c3e\u306e\u6539\u884c\u3092\u5fd8\u308c\u306a\u3044\u3053\u3068\uff09<\/kbd><br>\u3000<kbd>}<br>\u3000else<\/kbd><br>\u3000<kbd>{<br>\u3000\u3000\u3000if ( y &lt; 0 )<br>\u3000\u3000\u3000{<br>\u3000\u3000\u3000\u3000\u3000x = -x;<br>\u3000\u3000\u3000\u3000\u3000y = -y;<br>\u3000\u3000\u3000}<br>\u3000\u3000\u3000x \u3068 y \u3092 x\/y \u306e\u304b\u305f\u3061\u3067\u51fa\u529b\u3059\u308b\uff08\u672b\u5c3e\u306e\u6539\u884c\u3092\u5fd8\u308c\u306a\u3044\u3053\u3068\uff09<br>\u3000}<br><\/kbd>\u3000<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u3010\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u3011\uff08\u305d\u306e\uff11\uff09<\/strong>\u203b<span style=\"color:#ff0000\" class=\"has-inline-color\">\u8d64\u5b57<\/span>\u306f\u5b9f\u884c\u6642\u306b\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u5165\u529b\u3059\u308b\u5185\u5bb9<\/li>\n<\/ul>\n\n\n\n<pre class=\"example\" style=\"width: 310px; margin-top: -15pt; margin-bottom: 10px\">\u6574\u6570\u3092 2 \u3064\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<span style=\"color:#ff0000\" class=\"has-inline-color\">3 0<\/span>\n\u8868\u793a\u3067\u304d\u307e\u305b\u3093<span style=\"color:#00aa00\">\u23ce<\/span>\n\n<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u3010\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u3011\uff08\u305d\u306e\uff12\uff09<\/strong>\u203b<span style=\"color:#ff0000\" class=\"has-inline-color\">\u8d64\u5b57<\/span>\u306f\u5b9f\u884c\u6642\u306b\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u5165\u529b\u3059\u308b\u5185\u5bb9<\/li>\n<\/ul>\n\n\n\n<pre class=\"example\" style=\"width: 310px; margin-top: -15pt; margin-bottom: 10px\">\u6574\u6570\u3092 2 \u3064\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<span style=\"color:#ff0000\" class=\"has-inline-color\">12 -5<\/span>\n-12\/5<span style=\"color:#00aa00\">\u23ce<\/span>\n\n<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u3010\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u3011\uff08\u305d\u306e\uff13\uff09<\/strong>\u203b<span style=\"color:#ff0000\" class=\"has-inline-color\">\u8d64\u5b57<\/span>\u306f\u5b9f\u884c\u6642\u306b\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u5165\u529b\u3059\u308b\u5185\u5bb9<\/li>\n<\/ul>\n\n\n\n<pre class=\"example\" style=\"width: 330px; margin-top: -15pt; margin-bottom: 10px\">\u6574\u6570\u3092 2 \u3064\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<span style=\"color:#ff0000\" class=\"has-inline-color\">-123 -8<\/span>\n123\/8<span style=\"color:#00aa00\">\u23ce<\/span>\n\n<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u3010\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u3011\uff08\u305d\u306e\uff14\uff09<\/strong>\u203b<span style=\"color:#ff0000\" class=\"has-inline-color\">\u8d64\u5b57<\/span>\u306f\u5b9f\u884c\u6642\u306b\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u5165\u529b\u3059\u308b\u5185\u5bb9<\/li>\n<\/ul>\n\n\n\n<pre class=\"example\" style=\"width: 330px; margin-top: -15pt; margin-bottom: 10px\">\u6574\u6570\u3092 2 \u3064\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<span style=\"color:#ff0000\" class=\"has-inline-color\">-3 6<\/span>\n-3\/6<span style=\"color:#00aa00\">\u23ce<\/span>\n\n<\/pre>\n\n\n\n<p class=\"miss\"><strong>\u3010\u904e\u53bb\u306b\u3042\u3063\u305f\u30df\u30b9\uff08\u5b9f\u969b\u306b\u6e1b\u70b9\u3068\u306a\u308a\uff0c\u3084\u308a\u76f4\u3057\u3092\u547d\u3058\u3089\u308c\u305f\u4f8b\uff09\u3011<\/strong><br> \u25a0 <strong>\u5b9f\u884c\u306e<span class=\"tadv-color\" style=\"color:#ff0000\">\u753b\u9762\u51fa\u529b\u304c\u4e0a\u306e\u4f8b\u3068\u9055\u3046<\/span><\/strong>\uff08<strong><span class=\"tadv-color\" style=\"color:#0000ff\">\u304d\u3061\u3093\u3068\u78ba\u8a8d\u3057\u3066\u3044\u306a\u3044<\/span><\/strong>\uff09\uff0e<br>\u3000\u3000\uff08\u4f8b\uff11\uff09\u5206\u6bcd\u306e\u65b9\u306b\u30de\u30a4\u30ca\u30b9\u8a18\u53f7\u3092\u8868\u793a\u3055\u305b\u3066\u3057\u307e\u3063\u3066\u3044\u308b\uff0e<br>\u3000\u3000\uff08\u4f8b\uff12\uff09\u300c\u8868\u793a\u3067\u304d\u307e\u305b\u3093\u300d\u306b\u8a72\u5f53\u3059\u308b\u5834\u5408\u3067\u3082\u5206\u6570\u3092\u8868\u793a\u3055\u305b\u3066\u3057\u307e\u3063\u3066\u3044\u308b\uff0e<br> \u25a0 <strong><span class=\"tadv-color\" style=\"color:#0000ff\">\u30a4\u30f3\u30c7\u30f3\u30c8\u306b\u4e0d\u5099<\/span><\/strong>\u304c\u3042\u308b\uff08<a href=\"https:\/\/se.cite.ehime-u.ac.jp\/jp\/lecture\/prog\/vscode-%e4%b8%8a%e3%81%a7%e3%82%a4%e3%83%b3%e3%83%87%e3%83%b3%e3%83%88%e3%82%92%e8%87%aa%e5%8b%95%e3%81%a7%e6%8f%83%e3%81%88%e3%82%8b%e6%96%b9%e6%b3%95\/\" target=\"_blank\" rel=\"noreferrer noopener\">VSCode \u4e0a\u3067\u30a4\u30f3\u30c7\u30f3\u30c8\u3092\u81ea\u52d5\u3067\u63c3\u3048\u308b\u4f5c\u696d<\/a>\u3092\u3084\u3063\u3066\u3044\u306a\u3044\uff09\uff0e<\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-very-dark-gray-color has-css-opacity has-very-dark-gray-background-color has-background is-style-wide\"\/>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<p>\u2190 [ <a href=\"https:\/\/se.cite.ehime-u.ac.jp\/jp\/lecture\/prog\/exercise-advance\/ex02\/ex0204a\/\">\u554f 4 (ex0204a.c)<\/a> ]<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"has-text-align-right\"><strong>\u30df\u30b9\u304c\u7121\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u3089<\/strong>\u6b21\u306e\u554f\u984c\u3078 \u2192 [ <a href=\"https:\/\/se.cite.ehime-u.ac.jp\/jp\/lecture\/prog\/exercise-advance\/ex02\/ex0206a\/\">\u554f6 (ex0206a.c)<\/a> ]<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u554f 5\uff08\u63d0\u51fa\u30d7\u30ed\u30b0\u30e9\u30e0\u540d\uff1aex0205a.c\uff09 \u6b21\u306e\u624b\u9806\u306b\u5f93\u3063\u3066 2 \u3064\u306e\u6574\u6570\u3067\u4f5c\u3089\u308c\u308b\u5206\u6570\u3092\u51fa\u529b\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u306a\u3055\u3044\uff0e\u305f\u3060\u3057\uff0c\u7d04\u5206\u306f\u8003\u3048\u306a\u304f\u3066\u3088\u3044\uff0e\u8868\u793a\u306e\u3055\u305b\u65b9\u306f\u5b9f\u884c\u4f8b\u306e\u901a\u308a\u3068\u3059\u308b\uff0e\u63d0\u51fa\u3059\u308b\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\uff08\u30bd\u30fc <a class=\"more-link\" href=\"https:\/\/se.cite.ehime-u.ac.jp\/jp\/lecture\/prog\/exercise-advance\/ex02\/ex0205a\/\">&#8230; more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":9142,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9187","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/pages\/9187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/comments?post=9187"}],"version-history":[{"count":6,"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/pages\/9187\/revisions"}],"predecessor-version":[{"id":12131,"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/pages\/9187\/revisions\/12131"}],"up":[{"embeddable":true,"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/pages\/9142"}],"wp:attachment":[{"href":"https:\/\/se.cite.ehime-u.ac.jp\/jp\/wp-json\/wp\/v2\/media?parent=9187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}