如何使用带有点和 typedef 结构的函数

Question

说实话，这是一个家庭作业。但是我已经花了 2 天，没有得到任何结果。我不擅长编程，但它是一个强制性模块。

用typedef构建一个struct，然后用struct写一个函数来收集信息并使用指针方法的问题。

下面是代码，只包括结构体和函数部分，其他的我自己还是想做的。请相信我，我已经尽力做到了

//Assignment.cpp

#include <stdio.h> //Pre-define in question, can't change
#include <ctype.h> //Pre-define in question, can't change
#include <stdlib.h> //Pre-define in question, can't change

//Requirement: Use typedef to create a struct called Car

typedef struct Car{
    float price;
    unsigned int numofmonth;
    unsigned char member;
}Car;

Car *p
struct Car customer1;
struct Car *p=&customer1;

//Function phototype
void collectInfo(Car *p); //pre-define in question, can't change
void printInfo(Car p); //Pre-define in question, can't change //Once the Collect info part done, I will do it myself


int main(){ //Pre-define in question, can't change
    Car customer1; //Pre-define in question, can't change
    collectInfo(&customer1); //Pre-define in question, can't change
    printInfo(customer1); //Pre-define in question, can't change

    system("pause"); //Pre-define in question, can't change

    return 0; //Pre-define in question, can't change
}

//Function defintions // The problem I want to ask, how to make it work? Thanks
void collecInfo(Car *p){ //Pre-define in question, can't change
    for(int i = 0; i < 3;i++){
    printf("Price of Car : ");
    scanf("%d",&customer1[i].price);
    printf("Perferred Months for Installment : ");
    scanf("%d",&customer1[i].numofmonth);
    printf("Perferred Months for Installment : ");
    scanf("%c",&customer1[i].member);

    printf("\n");
    }
}

感谢你们所有的cmets。

其实是一个关于“贷款计算”的问题。 要求是使用typedef、struct、指针和函数来完成程序，我对指针只有一个简单的想法。据我所知，这是为了永久解决问题。

这是完整的问题和我到目前为止所做的代码。

问：有以下要求，做一个汽车安装程序，如下面的屏幕转储：

1. 价格

2. 分期月数（只能选择24或36个月，请输入验证）

3. 如果客户加入会员。

变量： - 24个月利率为10%

• 36个月利率为15%

• 如果加入会员，可一次性退还 3000 美元的总贷款

• 第一个月的付款将是总贷款的 20%

屏幕转储示例：

汽车价格：30000

分期付款的首选月份：36

您是否加入我们的会员（y/n）：y

==================

打印详细信息：

==================

总贷款：31500

第一个月付款：6300

月供：700

下面是我现在还在做的代码

//Assignment.cpp

#include <stdio.h> //Pre-define in question, can't change
#include <ctype.h> //Pre-define in question, can't change
#include <stdlib.h> //Pre-define in question, can't change

//Use typedef to create a struct called Car

typedef struct Car{
    float price;
    unsigned int numofmonth;
    unsigned char member;
       }Car;

Car *p
struct Car customer1;
struct Car *p=&customer1;

//Function phototype
void collectInfo(Car *p); //pre-define in question, can't change
void printInfo(Car p); //Pre-define in question, can't change

int main(){ //Pre-define in question, can't change
    Car customer1; //Pre-define in question, can't change
    collectInfo(&customer1); //Pre-define in question, can't change
    printInfo(customer1); //Pre-define in question, can't change

    system("pause"); //Pre-define in question, can't change

    return 0; //Pre-define in question, can't change
}

//Function defintions
void collecInfo(Car *p){ //Pre-define in question, can't change
    int interest;
    int lumpsum;

    printf("Price of Car : ");
    scanf("%f",&(p->price));

    //check if the installment is 24 or 36
    printf("Perferred Months for Installment : ");
    scanf("%u",&(p->numofmonth));
    if(p->numofmonth == 24)
        interest=0.1;
    else if(p->numofmonth == 36)
        interest=0.15;
    else
        printf("Sorry, we only accept 24 or 36 months installment");

    printf("Are you our member (y/n) : ");
    scanf("%u",(p->member));

    //check if the member = y or n
    if(p->member == 'y')
    lumpsum=-3000;
    else if(p->member == 'n')
        lumpsum=0;
    else 
        printf("Please only input 'y' or 'n'");

    printf("\n");

}
//Show result on screen, still doing, have problem to display result of pointer...
void printInfo(Car p){
    printf("Price of the Car: %.2f\n", customer1.price);
    printf("Preferred Months for Installment : %u\n", customer1.numofmonth);
    printf("Are you our member (y/n) : %u\n", customer1.member);
    printf("========================================\n");
    printf("See the installment details below\n");
    printf("========================================\n\n");

    float total;
    total= // still doing, have problem to display result of pointer...
}

经过大量 google，我尝试在函数 colecInfo 中使用 malloc

Answer 1

您在函数中获得了 Car*。使用它，即

void collecInfo(Car *p){ //Pre-define in question, can't change
    printf("Price of Car : ");
    scanf("%d",&(p->price));
    ...

Answer 2

不应该这样： scanf("%d",&customer1[i].numofmonth);

成为

scanf("%u",&customer1[i].numofmonth);

还有：

scanf("%d",&customer1[i].price);

成为

scanf("%f",&customer1[i].price);

格式说明符应与变量的类型相匹配。 unsigned int 使用 %u 和 float 使用 %f。