{"id":29400,"date":"2023-01-07T09:36:51","date_gmt":"2023-01-07T04:06:51","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-delete-all-digits-except-one\/"},"modified":"2023-01-07T09:36:51","modified_gmt":"2023-01-07T04:06:51","slug":"solved-delete-all-digits-except-one","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-delete-all-digits-except-one\/","title":{"rendered":"[Solved] delete all digits except one"},"content":{"rendered":"

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Just to show you current C++ (C++20) works a bit different then wat most (older) C++ material teaches you.<\/p>\n

#include <algorithm>\n#include <iostream>\n#include <string>\n#include <ranges>\n\nbool is_not_four(const char digit)\n{\n    return digit != '4';\n}\n\nint main()\n{\n    \/\/ such a big number iwll not fit in any of the integer types \n    \/\/ needs to be stored in memory\n    std::string big_number{ \"4732891432890432432094732089174839207894362154\" };\n\n    \/\/ or input big_number from std::cin\n    \n    \/\/  std::cout >> \"input number : \"\n    \/\/   std::cin >> big_number;\n    \n    \/\/ NEVER trust user input\n    if (!std::any_of(big_number.begin(), big_number.end(), std::isdigit))\n    {\n        std::cout << \"input should only contain digits\";\n    }\n    else\n    {\n        \/\/ only loop over characters not equal to 4\n        for (const char digit : big_number | std::views::filter(is_not_four))\n        {\n            std::cout << digit;\n        }\n\n        \/\/ you can also remove characters with std::remove_if\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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solved delete all digits except one <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Just to show you current C++ (C++20) works a bit different then wat most (older) C++ material teaches you. #include <algorithm> #include <iostream> #include <string> #include <ranges> bool is_not_four(const char digit) { return digit != ‘4’; } int main() { \/\/ such a big number iwll not fit in any of the integer types … 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":[324,702],"class_list":["post-29400","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-integer"],"yoast_head":"\n[Solved] delete all digits except one - 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-delete-all-digits-except-one\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] delete all digits except one - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Just to show you current C++ (C++20) works a bit different then wat most (older) C++ material teaches you. #include <algorithm> #include <iostream> #include <string> #include <ranges> bool is_not_four(const char digit) { return digit != '4'; } int main() { \/\/ such a big number iwll not fit in any of the integer types ... 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