a.cpp

身份證號碼的最後一碼為檢查碼

#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>

void main(){
	char realnum[11],id[10];
	int vow[26]={10,11,12,13,14,15,16,17,34,18,19,20,21,22,35,23,24,25,26,27,28,29,32,30,31,33};
	int total=0,i=0,j=10,final;
	ifstream DA("a.txt");
	DA.getline(id,10,'\n');
	DA.close();
	itoa(vow[id[0]-65],realnum,10);
	while(id[++i]!='\0') realnum[i+1] = id[i];
	i=0;
	total = (realnum[0]-48)*1;
	while(i != 11) total += (realnum[i]-48)*--j;
	final = 10 - total%10;
	cout << final << endl;
}