Question

老实说，这是一个功课。但是我花了2天时间没有结果。我不擅长编程，但它是一个强制性模块。

使用typedef构建结构所需的问题，然后使用struct编写一个收集信息的函数并使用指针方法。

以下是代码，仅包括结构和功能部分，以及我自己想要做的其他事情。请相信我，我尽力做到这一点

//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");
    }
}

感谢您的所有评论。

实际上，这是一个关于“贷款计算”的问题。要求是使用typedef，struct，pointer和function来完成程序，我只是对指针有一个简单的想法。据我所知，这是永久性的。

这是完整的问题和我迄今为止所做的代码。

问：有以下要求，并为screendump下面的汽车分期付款做一个程序：

价
分期付款的月数（只能选择24或36个月，请输入验证）
如果客户加入会员。

变量： - 24个月利率将为10％

36个月的利率将是15％
如果加入会员，总贷款一次性退还$ 3000
首月付款将占贷款总额的20％

示例screendump：

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：

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

贷款总额：31500

第一个月付款：6300

每月付款：700

以下是我现在仍在做的代码

//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...
}

经过很多谷歌，我试图在函数collecInfo中使用malloc

Answer 1

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

是

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

还有：

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

是

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

格式说明符应与变量类型匹配。 unsigned int使用%u而float使用%f。

Answer 2

你在这个功能中得到了一辆Car *。使用它，即

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

如何使用point和typedef结构的函数

2 个答案: