a020

輸入說明 ：

一組身分證號碼

輸出說明 ：

輸出 real or fake

先看開頭是什麼字母,看它是什麼對照題目換到另一個整數陣列的第一格和第二格(所以整數陣列要宣告有11格)(字元陣列也要11格才不會錯),接著把字元轉成數字,再來就去對整數陣列做題目說的運算,最後%10,輸出

#include<stdio.h>
#include<string.h>
int main(){
    char identity[11];
    int  check[11];
    int i;
    int sum,temp;
    while(scanf("%s",&identity)!=EOF)
    {
      if(identity[0]=='A')
      {
        check[0]=1;
        check[1]=0;
      }    

      if(identity[0]=='B')
      {
        check[0]=1;
        check[1]=1;
      }    
      if(identity[0]=='C')
      {
        check[0]=1;
        check[1]=2;
      }    
      if(identity[0]=='D')
      {
        check[0]=1;
        check[1]=3;
      }    
      if(identity[0]=='E')
      {
        check[0]=1;
        check[1]=4;
      }    
      if(identity[0]=='F')
      {
        check[0]=1;
        check[1]=5;
      }    
      if(identity[0]=='G')
      {
        check[0]=1;
        check[1]=6;
      }    
      if(identity[0]=='H')
      {
        check[0]=1;
        check[1]=7;
      }    
      if(identity[0]=='I')
      {
        check[0]=3;
        check[1]=4;
      }    
      if(identity[0]=='J')
      {
        check[0]=1;
        check[1]=8;
      }    
      if(identity[0]=='K')
      {
        check[0]=1;
        check[1]=9;
      }    
      if(identity[0]=='L')
      {
        check[0]=2;
        check[1]=0;
      }    
      if(identity[0]=='M')
      {
        check[0]=2;
        check[1]=1;
      }    
      if(identity[0]=='N')
      {
        check[0]=2;
        check[1]=2;
      }    
      if(identity[0]=='O')
      {
        check[0]=3;
        check[1]=5;
      }    
      if(identity[0]=='P')
      {
        check[0]=2;
        check[1]=3;
      }    
      if(identity[0]=='Q')
      {
        check[0]=2;
        check[1]=4;
      }    
      if(identity[0]=='R')
      {
        check[0]=2;
        check[1]=5;
      }    
      if(identity[0]=='S')
      {
        check[0]=2;
        check[1]=6;
      }    
      if(identity[0]=='T')
      {
        check[0]=2;
        check[1]=7;
      }    
      if(identity[0]=='U')
      {
        check[0]=2;
        check[1]=8;
      }    
      if(identity[0]=='V')
      {
        check[0]=2;
        check[1]=9;
      }    
      if(identity[0]=='W')
      {
        check[0]=3;
        check[1]=2;
      }    
      if(identity[0]=='X')
      {
        check[0]=3;
        check[1]=0;
      }    
      if(identity[0]=='Y')
      {
        check[0]=3;
        check[1]=1;
      }    
      if(identity[0]=='Z')
      {
        check[0]=3;
        check[1]=3;
      }    
    for(i=1;i<10;i++)
    { 
     if(identity[i]=='0')
      check[i+1]=0;
     if(identity[i]=='1')
      check[i+1]=1;
     if(identity[i]=='2')
      check[i+1]=2;
     if(identity[i]=='3')
      check[i+1]=3;
     if(identity[i]=='4')
      check[i+1]=4;
     if(identity[i]=='5')
      check[i+1]=5;
     if(identity[i]=='6')
      check[i+1]=6;
     if(identity[i]=='7')
      check[i+1]=7;
     if(identity[i]=='8')
      check[i+1]=8;
     if(identity[i]=='9')
      check[i+1]=9;    
     }

     sum=0;
     sum=check[0]+check[10];
     for(i=1;i<10;i++)
      {
        temp=check[i]*(10-i);
        sum+=temp;
      }    

     if(sum%10==0) 
     printf("real\n");
     else
     printf("fake\n");  
    }
return 0;    
}