{"id":23300,"date":"2022-11-25T03:44:39","date_gmt":"2022-11-24T22:14:39","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-taking-main-argument-duplicate\/"},"modified":"2022-11-25T03:44:39","modified_gmt":"2022-11-24T22:14:39","slug":"solved-taking-main-argument-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-taking-main-argument-duplicate\/","title":{"rendered":"[Solved] Taking main argument [duplicate]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-63312660\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"63312660\" data-parentid=\"63312602\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>[Note: <code>C<\/code> does not have builtin <code>string<\/code> type. What <code>C<\/code> has is <code>character array<\/code>]<\/p>\n<p>This is a very easy to solve problem. Here&#8217;s the code given, it uses <code>stdlib<\/code>&#8216;s builtin <code>atoi<\/code> function to convert <code>string<\/code> to <code>int<\/code>:<\/p>\n<pre><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n\nint main(int argc, char *argv[]) {\n\n    if (argc == 2) {\n    \n        char *var_str = argv[1];\n        \n        int variation = atoi(var_str);\n\n        printf(\"variation: %d\\n\", variation);\n    \n    }\n    else if (argc &lt; 2) {\n    \n        printf(\"no agrument provided.\\n\");\n\n    } else {\n\n        printf(\"only one argument was expected. %d provided.\\n\", argc);\n    }\n    \n    return 0;\n}\n<\/code><\/pre>\n<p><strong>Update (A more secure version using <code>strtol<\/code>):<\/strong><\/p>\n<p>As <code>strtol<\/code> is a better function to convert <code>string<\/code> to <code>long int<\/code>, than <code>atoi<\/code>, because of it&#8217;s error detecting <code>utility<\/code>, it&#8217;s better to use <code>strtol<\/code> in this regard. This practice is heavily enforced by user <code>@klutt<\/code>. I would like to thank her\/him for advising me to include the code using <code>strtol<\/code> too. It is given below:<\/p>\n<pre class=\"lang-c prettyprint-override\"><code>\/\/ a more secure version\n\n#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;errno.h&gt;\n#include &lt;limits.h&gt;\n\nint main(int argc, char *argv[]) {\n\n    if (argc == 2) {\n        char *var_str = argv[1];\n\n        char *text = NULL;\n        int base = 10; \/\/ default base\n\n        errno = 0; \/\/ intializing errno\n\n        long int variation = 0;\n        variation = strtol(var_str, &amp;text, base);\n\n        \/\/ now on to error detection\n        \/\/ full error trace\n        if (var_str == text) {\n            printf (\"error: no number found\\n\");\n\n        } else if (errno == ERANGE &amp;&amp; variation == LONG_MIN) {\n            printf (\"error: underflow\\n\");\n\n        } else if (errno == ERANGE &amp;&amp; variation == LONG_MAX) {\n            printf (\"error: overflow\\n\");\n\n        } else if (errno != 0 &amp;&amp; variation == 0) {\n            printf (\"error: unknown error\\n\");\n\n        } else if (errno == 0 &amp;&amp; var_str &amp;&amp; !*text) {\n            printf (\"variation: %ld\\n\", variation);\n\n        } else if (errno == 0 &amp;&amp; var_str &amp;&amp; *text != 0) {\n            printf (\"variation: %d, but some text included: %s\\n\", variation, text);\n        }\n\n    } else if (argc &lt; 2) {\n    \n        printf(\"no agrument provided.\\n\");\n\n    } else {\n\n        printf(\"only one argument was expected. %d provided.\\n\", argc);\n    }\n    \n    return 0;\n}\n<\/code><\/pre>\n<p>If you have any questions, ask me in comment&#8230;<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">14<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Taking main argument [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] [Note: C does not have builtin string type. What C has is character array] This is a very easy to solve problem. Here&#8217;s the code given, it uses stdlib&#8216;s builtin atoi function to convert string to int: #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; int main(int argc, char *argv[]) { if (argc == 2) { char *var_str &#8230; <a title=\"[Solved] Taking main argument [duplicate]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-taking-main-argument-duplicate\/\" aria-label=\"More on [Solved] Taking main argument [duplicate]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1340,324,1339,816,409],"class_list":["post-23300","post","type-post","status-publish","format-standard","hentry","category-solved","tag-argv","tag-c","tag-command-line-arguments","tag-cs50","tag-program-entry-point"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Taking main argument [duplicate] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-taking-main-argument-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Taking main argument [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] [Note: C does not have builtin string type. What C has is character array] This is a very easy to solve problem. Here&#8217;s the code given, it uses stdlib&#8216;s builtin atoi function to convert string to int: #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; int main(int argc, char *argv[]) { if (argc == 2) { char *var_str ... 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