{"id":1303,"date":"2021-02-23T22:05:14","date_gmt":"2021-02-23T22:05:14","guid":{"rendered":"https:\/\/www.ipocomputer.com\/lpc_en\/?p=1303"},"modified":"2021-04-21T02:29:01","modified_gmt":"2021-04-21T02:29:01","slug":"problem-3","status":"publish","type":"post","link":"https:\/\/retalhos.net\/ipocomputer\/2021\/02\/problem-3\/","title":{"rendered":"PROBLEM 3"},"content":{"rendered":"
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Problem: Calculation of the check digit<\/span><\/h4>\n

 <\/p>\n

Read a card file (ends with \/ * col 1-2) with CPF numbers and check the validity<\/span>.<\/strong><\/span><\/p>\n

Calculation of the check digit of the CPF (BR – Registration physical personer), issued by the Federal Revenue Service.<\/p>\n

The CPF number has 9 digits plus two check digits, which are indicated after a slash. Therefore, a CPF has 11 digits. The CPF number is written in the form ABCDEFGHI \/ JK or directly as ABCDEFGHIJK, where the figures cannot all be the same.<\/p>\n

The J<\/span><\/strong> is called the 1st check digit of the CPF number.<\/span><\/p>\n

The K<\/strong><\/span> is called the 2nd digit of the CPF number.<\/p>\n

First Digit<\/span><\/strong><\/p>\n

To obtain J<\/span><\/strong>, we multiply A, B, C, D, E, F, G, H and I by the corresponding constants:<\/p>\n\n<\/colgroup>\n\n\n\n
A<\/td>\nB<\/td>\nC<\/td>\nD<\/td>\nE<\/td>\nF<\/td>\nG<\/td>\nH<\/td>\nI<\/td>\n<\/tr>\n
x10<\/td>\nx9<\/td>\nx8<\/td>\nx7<\/td>\nx6<\/td>\nx5<\/td>\nx4<\/td>\nx3<\/td>\nx2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The result of the sum, 10A + 9B + 8C + 7D + 6E + 5F + 4G + 3H + 2I, is divided by 11.<\/p>\n

We then analyze the REST of that division:<\/p>\n

If it is 0 or 1, the digit J is [0] (zero). If it is 2, 3, 4, 5, 6, 7, 8, 9 or 10, the digit J is [11 – REST]<\/p>\n

Second Digit<\/strong><\/span><\/p>\n

We already have J<\/span><\/strong>. To obtain K<\/strong><\/span>, we multiply A, B, C, D, E, F, G, H, I and J by the corresponding constants:<\/p>\n\n<\/colgroup>\n\n\n\n
A<\/td>\nB<\/td>\nC<\/td>\nD<\/td>\nE<\/td>\nF<\/td>\nG<\/td>\nH<\/td>\nI<\/td>\nJ<\/span><\/td>\n<\/tr>\n
x11<\/td>\nx10<\/td>\nx9<\/td>\nx8<\/td>\nx7<\/td>\nx6<\/td>\nx5<\/td>\nx4<\/td>\nx3<\/td>\nx2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The result of the sum, 11A + 10B + 9C + 8D + 7E + 6F + 5G + 4H + 3I + 2J, is divided by 11.<\/p>\n

We then verify the REST of that division:<\/p>\n

If it is 0 or 1, the digit K<\/strong><\/span> is [0] (zero). If it is 2, 3, 4, 5, 6, 7, 8, 9 or 10, the K<\/span><\/strong> digit is [11 – REST].<\/p><\/blockquote>\n<\/blockquote>\n

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Problem: Calculation of the check digit   Read a card file (ends with \/ * col 1-2) with CPF numbers and check the validity. Calculation […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1303","post","type-post","status-publish","format-standard","hentry","category-problems"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t