{"id":6493,"date":"2022-09-03T15:21:35","date_gmt":"2022-09-03T09:51:35","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-operate-on-global-variables-in-c\/"},"modified":"2022-09-03T15:21:35","modified_gmt":"2022-09-03T09:51:35","slug":"solved-how-to-operate-on-global-variables-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-operate-on-global-variables-in-c\/","title":{"rendered":"[Solved] how to operate on global variables in c++"},"content":{"rendered":"

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The problem is that you’re storing pointers into cstr<\/code> in argv<\/code>, but then you’re deleting cstr<\/code> at the end of the parse()<\/code> function. Get rid of:<\/p>\n

delete[] cstr;\n<\/code><\/pre>\n
Also, you should pass argc<\/code> by reference. Otherwise, when you update it in the parse()<\/code> function it won’t update the caller’s variable. So it should be:<\/p>\n
void parse(string str, int &argc, char *argv[])\n<\/code><\/pre>\n
However, you also have a memory leak. You’re creating a new cstr<\/code> each time parse<\/code> is called, but never deleting it. You should change the function to return cstr<\/code>, and have the caller delete it when they’re done with that parsed line.<\/p>\n
char *parse(str str, int &argv, char *argv[]) {\n    ...\n    return cstr;\n}\n<\/code><\/pre>\n
Then in your main()<\/code> loop, do:<\/p>\n
int main( void ) \n{\n    string theLine;\n\n    while (true) \n        {\n            cout << \"myshell> \";\n            getline(cin,theLine);\n            cout << \"Command was: \" << theLine << endl;\n            if ((theLine == \"exit\") || (cin.eof()) || (theLine == \"quit\"))\n                exit(0); \n\n            char *cstr = parse(theLine, argc, argv);\n            cout << \"argv[0] \" << argv[0] << \"\\n\";\n            delete[] cstr;\n        }   \n}\n<\/code><\/pre>\n<\/p><\/div>\n
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            5<\/span> <\/p><\/div>\n<\/div>\n
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solved how to operate on global variables in c++ <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] The problem is that you’re storing pointers into cstr in argv, but then you’re deleting cstr at the end of the parse() function. Get rid of: delete[] cstr; Also, you should pass argc by reference. Otherwise, when you update it in the parse() function it won’t update the caller’s variable. So it should be: … 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":[324,1798,366],"class_list":["post-6493","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-global","tag-variables"],"yoast_head":"\n[Solved] how to operate on global variables in c++ - 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-how-to-operate-on-global-variables-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] how to operate on global variables in c++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The problem is that you’re storing pointers into cstr in argv, but then you’re deleting cstr at the end of the parse() function. Get rid of: delete[] cstr; Also, you should pass argc by reference. Otherwise, when you update it in the parse() function it won’t update the caller’s variable. So it should be: ... 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