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POHow do I use a structure?
 

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  1. POHow do I use a structure?
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    <p>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).</p> <p>Here is my code, I've gotten some suggestions and even bits of code from you guys, but after implementing them I'm even more confused on what I should do. Please take a look at it and critique me. </p> <p>EDIT: I also added in on the code where I'm receiving and error</p> <p>Thank you.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; int main (void) { int * studentData= NULL; int * studentDataType=NULL; int students; int studentID; int year; int month; int day; long long phone; printf("How many students are you entering records for:\n"); scanf("%d", &amp;students); studentData=(int*)malloc((sizeof(int)*students)); struct studentDataType { int studentID; int year; int month; int day; long long phone; }; //invalid operands to binary * (have 'int' and 'int *') studentDataType *studentData = (studentDataType*)malloc(numberOfStudents *sizeof(studentData)); for (int i = 0 ; i &lt; students ; ++i) { printf("%d, %d, %d, %d, %d\n", studentID, year, month, day, phone); } } </code></pre>
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    1. USRaju Kundhe
    1. USuser2172993
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    1. CO[Please don't cast the return value of `malloc()` in C](http://stackoverflow.com/a/605858/28169).
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      1. USunwind
    2. COstudentData is merely an integer, you seem to be casting a pointer to integers to studentDataType. I think you want something like: struct studentDataType *studentRecords = malloc(sizeof(struct studentDataType) * studentNumbers);
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      1. POHow do I use a structure?
      1. USadrianmcmenamin
 

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