求身份证第18位的算法！！！

[kittity]

[wjyasd]

转……其他人的！ ^&^


#include "stdio.h"
#include "string.h"
#include "conio.h"

//* gen New 18 ID Card from old 15 ID
char genNewID( char ID[], char NewID[])
{
int W[18] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1};

char A[11] = {'1','0','x','9','8','7','6','5','4','3','2'};
int i,j,S;

if(strlen(ID) != 15)
return -1;

memcpy( NewID, ID, 6 );

NewID[6]='1';
NewID[7]='9';
NewID[8]=0;

strcat( NewID, &ID[6] );
S = 0;
for(i=0;i<17;i++)
{
j = (NewID[i] - '0') * W[i];
S = S + j;
}
S = S % 11;
NewID[17] = A[S];
NewID[18] = 0;
return A[S];
}


int main(int argc, char* argv[])
{
char ID[20], NewID[20],ret=0;
puts("输入原来的15位身份证号码，产生新的18位身份证号码\n");
do{
printf("Input your old 15 ID Card: ");
scanf( "%s", ID );
if(stricmp(ID, "exit") == 0)
break;
ret = genNewID( ID, NewID );
printf("Your New 18 ID Card:　　　 %s \n\n", ret != -1 ? NewID : "Input Error!!");
}while(1);
getch();
return 0;
}

[wjyasd]

原文在……

// NewIdcard.cpp : Defines the entry point for the console application.
/*输入原来的15位身份证号码，产生新的18位身份证号码的程序，谁的算的不对，说一声
可执行程序在这：bingle.sitenova.net/myprog/newidcard.exe
*/