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PAT/PATBasic/1031.c
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2017-04-19 12:12:33 +08:00

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/**
* 1031. 查验身份证(15)
*
* 一个合法的身份证号码由17位地区、日期编号和顺序编号加1位校验码组成。校验码的计算
* 规则如下:
*
* 首先对前17位数字加权求和,权重分配为:
* {79105842163,7,9,10,5,8,4,2};然后将计算的和对11取模得
* 到值Z;最后按照以下关系对应Z值与校验码M的值:
*
* Z0 1 2 3 4 5 6 7 8 9 10
* M1 0 X 9 8 7 6 5 4 3 2
*
* 现在给定一些身份证号码,请你验证校验码的有效性,并输出有问题的号码。
*
* 输入格式:
*
* 输入第一行给出正整数N(<= 100)是输入的身份证号码的个数。随后N行,每行给出1个18位
* 身份证号码。
*
* 输出格式:
*
* 按照输入的顺序每行输出1个有问题的身份证号码。这里并不检验前17位是否合理,只检查
* 前17位是否全为数字且最后1位校验码计算准确。如果所有号码都正常,则输出“All passed”。
*
* 输入样例1
* 4
* 320124198808240056
* 12010X198901011234
* 110108196711301866
* 37070419881216001X
* 输出样例1
* 12010X198901011234
* 110108196711301866
* 37070419881216001X
* 输入样例2
* 2
* 320124198808240056
* 110108196711301862
* 输出样例2
* All passed
*/
#include <stdio.h>
int main()
{
int N;
int weight[] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
char ZtoM[] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
char ID[19];
scanf("%d", &N);
int d, sum, count = 0; /* index, weighted sum and count for legal IDs */
for(int i = 0; i < N; i++)
{
scanf("%s", ID);
for(d = 0, sum = 0; d < 17 && ID[d] >= '0' && ID[d] <= '9'; d++)
sum += (ID[d] - '0') * weight[d];
if(d == 17 && ID[17] == ZtoM[sum % 11]) /* legal ID */
count++;
else /* illegal ID */
puts(ID);
}
if(count == N)
puts("All passed");
return 0;
}