1. //
    2. //  main.c
    3. //  test_d
    4. //
    5. //  Created by dezhu on 2021/12/23.
    6. //  Copyright © 2021年 dezhu. All rights reserved.
    7. //
    9. #include <stdio.h>
    10. #include <stdlib.h>
    12. int main(int argc, const char * argv[]) {
    13.     // insert code here...
    14.     char i;
    15.     double u = 0.7;
    16.     double e = 0.5;
    17.     double money;
    18.     double exchange;
    19.     printf("input what you want(u means uk, a means america)");
    20.     scanf("%c",&i);
    21.     if(i=='u'){
    22.         exchange=u;
    23.     }
    24.     if(i=='e'){
    25.         exchange=e;
    26.     }
    27.     printf("please input number of money...\n");
    29.     scanf("%lf", &money);
    31.     money = money * exchange;
    33.     printf("this is a number of money", money);
    34.     return 0;
    35. }