函式_身分證驗證

void ID_Check(char ID[]);
#include <stdio.h>
#include <stdlib.h>
void ID_Check(char ID[]) {
    int n1 = ID[0];
    if (n1== 73) {
        n1 = 34;
    }
    else if (n1 == 81) {
        n1 = 35;
    }
    else if (n1 < 73){
        n1 = n1 - 55;
    }
    else if (n1 < 81) {
        n1 = n1 - 56;
    }
    else if (n1 > 81) {
        n1 = n1 - 57;
    }

    ID[0] = ' ';
    int IDnum =atoi(ID);
    int sum = (n1 / 10) + (n1 % 10) * 9 +IDnum%10;
    for (int i = 0; i <= 8; i++) {
        sum = sum + IDnum % 10 * i;
        IDnum = IDnum / 10;
    }
    if (sum % 10 == 0) {
        printf("real");
    }
    else {
        printf("fake");
    }
}


int main() {
    char ID[100];
    while (scanf("%s", ID) != EOF) {
        ID_Check(ID);
    }
    return 0;
}