我是否需要为我的作业三个独立的数组？ [英] Do I need to create three separate arrays for my assignment?

问题描述

好吧首先我会解释我的任务。对于这个任务，我不得不使用它我有没有问题，动态内存分配。什么我有是搞清楚工作我分配正确的方式有问题。对于我的任务，我需要建立一个程序，提示用户输入他们有多少学生然后问以下信息;学号，生日和电话号码。我需要使用一个循环来提示用户输入所有学生的信息。我需要创建一个循环，就能把所有的学生ID扫描并发现使用他们的生日最老的学生（循环必须通过3个以上的学生能够扫描）。

下面是我的code，我还没有做过这还多，因为我不知道真正从哪里开始。我已经设置了动态内存分配，但我不知道如何工作的这个休息。请帮我。

感谢您。

 的#include＆LT;＆stdio.h中GT;
＃包括LT＆;＆stdlib.h中GT;INT主要（无效）
{
为int * studentData = NULL;INT学生;
的printf（有多少学生进入你的记录：\\ n）;
scanf函数（％d个，＆安培;生）;studentData =（INT *）malloc的（（的sizeof（int）的*学生））;
}
 

解决方案

您可以定义一个结构：

  //定义一个类型，如int，焦炭，双...
typedef结构studentDataType {
    INT ID;
    INT birthDateDay;
    INT birthDateMonth;
    INT birthDateYear;
    INT phoneNumber的;
};
 

然后创建一个数组，其中各个元素的类型是studentData的：

  //创建一个数组，其中每个元素的类型是studentData的
studentDataType * studentData =（studentDataType *）malloc的（numberOfStudents *的sizeof（studentData））;
 

然后通过他们循环使用：

 的for（int i = 0; I＆LT; numberOfStudents ++我）{
    的printf（％I％I％I \\ N，studentData [I] .ID，studentData [I] .phoneNumber）;
}
 

Ok firstly I'll explain my assignment. For this assignment I have to use dynamic memory allocation which I am having no problems with. What I am having a problem with is figuring out the correct way to work my assignment. For my assignment I need to create a program that prompt the user to enter how many students they have then ask for the following information; Student ID, Birthdate, and Phone number. I need to use a loop to prompt the user to enter all the students information. I need to create a loop that will scan through all the student IDs and find the oldest student using their birthdate (The loop must be able scan through more then 3 students).

Here is my code, I havent done much in it yet because I'm not sure really where to start. I've already setup the dynamic memory allocation, but I don't know how to work the rest of this. Please help me.

Thank you.

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

int main (void)
{
int * studentData= NULL;

int students;
printf("How many students are you entering records for:\n");
scanf("%d", &students);

studentData=(int*)malloc((sizeof(int)*students));
}

解决方案

You could define a structure:

//Define a type, such as int, char, double...
typedef struct studentDataType {
    int ID;
    int birthDateDay;
    int birthDateMonth;
    int birthDateYear;
    int phoneNumber;
};

Then create an array, where each of those elements is of type studentData:

//Create an array, where each element is of type studentData
studentDataType *studentData = (studentDataType *)malloc(numberOfStudents * sizeof(studentData));

Then loop through them with:

for (int i = 0 ; i < numberOfStudents ; ++i) {
    printf("%i %i %i\n", studentData[i].ID, studentData[i].phoneNumber);
}

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