{"id":32508,"date":"2023-01-30T08:57:49","date_gmt":"2023-01-30T03:27:49","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-converting-float-to-int-effectively\/"},"modified":"2023-01-30T08:57:49","modified_gmt":"2023-01-30T03:27:49","slug":"solved-converting-float-to-int-effectively","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-converting-float-to-int-effectively\/","title":{"rendered":"[Solved] Converting float to int effectively"},"content":{"rendered":"

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Avoid changing the type used to represent money as done here between float<\/code> and int<\/code>.<\/p>\n

float totalAmount;  \nint totalAmountCents;\n...\ntotalAmountCents = totalAmount * 100;\n<\/code><\/pre>\n
Money has special issues involving exactness, range and functions that do not simply apply to integers like complex tax and interest rate calculations.  These issues are aggravated with casual type conversions.<\/p>\n
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For learning, start with int<\/code> or long<\/code> of the smallest unit of money and pay special attention to rounding.<\/p>\n
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If floating point type is required, rarely is float<\/code> a good choice.  Do not use integer conversion to round.  Use rint()<\/code> or round()<\/code><\/p>\n
double totalAmount;  \ndouble totalAmountCents;\n...\ntotalAmountCents = rint(totalAmount * 100);\n<\/code><\/pre>\n
If a conversion to int<\/code> is absolutely required, round using a floating point rounding function and then convert or use lrint()<\/code>.<\/p>\n
#include <math.h>\ntotalAmountCents = rint(totalAmount * 100);\nint iCents = (int) totalAmountCents;\n\/\/ or \nlong LCents = lrint(totalAmount * 100);\n<\/code><\/pre>\n<\/p><\/div>\n
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solved Converting float to int effectively <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Avoid changing the type used to represent money as done here between float and int. float totalAmount; int totalAmountCents; … totalAmountCents = totalAmount * 100; Money has special issues involving exactness, range and functions that do not simply apply to integers like complex tax and interest rate calculations. These issues are aggravated with casual … 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],"class_list":["post-32508","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c"],"yoast_head":"\n[Solved] Converting float to int effectively - 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-converting-float-to-int-effectively\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Converting float to int effectively - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Avoid changing the type used to represent money as done here between float and int. float totalAmount; int totalAmountCents; ... totalAmountCents = totalAmount * 100; Money has special issues involving exactness, range and functions that do not simply apply to integers like complex tax and interest rate calculations. 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