Question

我的任务有问题。我的程序将运行到哪里，但是我遇到了让它正常工作的问题。我应该定义一个结构类型＆＃39; auto_t＆＃39;并包括制造，型号，制造和购买日期，燃料盖，燃料水平和里程表的组件。每个都分为I / O函数（scan_auto，scan_date，scan_tank，print_auto，print_date，print_tank），并且还编写驱动函数以重复填充和显示自动结构变量，直到在输入文件中遇到EOF。示例数据集是：Mercury Sable 1 18 2001 5 30 1991 16 12.5 99892

到目前为止，这是我的代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
char make[15];
char model[30];

int mmon;
int mday;
int myear;

int pmon;
int pday;
int pyear;

float fuelcap;
float fuellevel;

float odometer;
} auto_t;

/ *参加制作和模型* /

int scan_auto(auto_t *vehicle) {
return scanf("%s %s", vehicle->make, vehicle->model);
}

/ *参加制造和购买日期* /

int scan_date(auto_t *date) {
return scanf("%d %d %d %d %d %d"
        , &date->mmon
        , &date->mday
        , &date->myear
        , &date->pmon
        , &date->pday
        , &date->pyear);            
}

/ *参加燃油和里程表信息* /

int scan_tank(auto_t *tank) {
return scanf("%f %f %f"
        , &tank->fuelcap
        , &tank->fuellevel
        , &tank->odometer);

void print_auto(auto_t vehicle) {
printf("%s %s \n"
    , vehicle.make
    , vehicle.model);
}

void print_date(auto_t date) {
printf("%d %d %d %d %d %d \n"
    , date.mmon
    , date.mday
    , date.myear
    , date.pmon
    , date.pday
    , date.pyear);
}

void print_tank(auto_t tank) {
printf("%f %f %f \n"
    , tank.fuelcap
    , tank.fuellevel
    , tank.odometer);
}

/ * Driver * /

int main(void) {
auto_t vehicle, date, tank;

while(1) {
    printf("Please enter the make, then model of the car: ");
    scan_auto(&vehicle);
        if(scan_auto(&vehicle) == EOF){
            break;
        }
    printf("Please enter the manufacture and purchase dates (ex. 1 18 2001): ");        
    scan_date(&date);
        if(scan_date(&date) == EOF){
            break;
        }
    printf("Please enter the fuel cap, current fuel level (in gallons), and the current      odometer reading: ");
    scan_tank(&tank);
        if(scan_tank(&tank) == EOF){
            break;
        }
/* Prints all of the cars information */    
    print_auto(vehicle);
    print_date(date);
    print_tank(tank);

}
return 0;       
}

我的问题是，当我运行程序时，scanf函数和scan_tank没有正确接收的数据被跳过。最后的打印功能似乎也打印了错误的数据（品牌和型号甚至没有显示），我不确定扫描或打印功能是否有问题。使用。此外，我似乎无法让程序循环结束，程序一直持续到关闭它为止。任何建议将不胜感激。我在C中编码并使用TextWrangler。

Answer 1

编辑：

代码中还有其他问题：

更改scanf不是为了表现，date->&pyear是完全的错误，因为pyear是date的成员，如果您想要访问pyear，请使用data->pyear。 &date->pyear表示 &(date->pyear)因为优先级->高于&。
调用函数scan_auto，scan_date和scan_tank 两次，我知道我不想那样，所以

//scan_auto(&vehicle); if(scan_auto(&vehicle) == EOF) if语句中的行也将被执行，因此请注释以上内容，其他＆＃34; scan＆＃34;功能。编辑2：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
char make[15];
char model[30];

int mmon;
int mday;
int myear;

int pmon;
int pday;
int pyear;

float fuelcap;
float fuellevel;

float odometer;
} auto_t;

int scan_auto(auto_t *vehicle) {
return scanf("%s %s", vehicle->make, vehicle->model);
}

int scan_date(auto_t *date) {
return scanf("%d %d %d %d %d %d"
        , &date->mmon
        , &date->mday
        , &date->myear
        , &date->pmon
        , &date->pday
        , &date->pyear);
}
int scan_tank(auto_t *tank) {
return scanf("%f %f %f"
        , &tank->fuelcap
        , &tank->fuellevel
        , &tank->odometer);
}
void print_auto(auto_t vehicle) {
printf("%s %s \n"
    , vehicle.make
    , vehicle.model);
}
void print_date(auto_t date) {
printf("%d %d %d %d %d %d \n"
    , date.mmon
    , date.mday
    , date.myear
    , date.pmon
    , date.pday
    , date.pyear);
}

void print_tank(auto_t tank) {
printf("%f %f %f \n"
    , tank.fuelcap
    , tank.fuellevel
    , tank.odometer);
}
int main()
{
auto_t vehicle;
auto_t date;
auto_t tank;
while(1) {
    printf("Please enter the make, then model of the car: \n");
    //scan_auto(&vehicle);
    if(scan_auto(&vehicle) == EOF){
        break;
    }
    printf("Please enter the manufacture and purchase dates (ex. 1 18 2001): \n");
    //scan_date(&date);
        if(scan_date(&date) == EOF){
            break;
        }
    printf("Please enter the fuel cap, current fuel level (in gallons), and the current      odometer reading: \n");
    //scan_tank(&tank);
        if(scan_tank(&tank) == EOF){
            break;
        }
    print_auto(vehicle);
    print_date(date);
    print_tank(tank);

    }
return 0;
}

高级C分配出错

1 个答案: