Question

我一直在阅读，我认为由于在我的程序中使用它之前没有分配指针而得到此错误。是这样的吗？如果是这样的话我该如何去做呢？（家庭作业）

Struct位于文件data.h中

 typedef struct student
 {
    char *firstName;
    char *lastName;
    int GPA;
    float tuitionFees;
    int numClass;
}Student;

这是在一个名为student.c的文件中。

Student Student_create()
    {

        Student *myStudent = malloc(sizeof(Student));
        assert(myStudent != NULL);

        printf("Please enter a name: ");
        scanf("%20s",myStudent->firstName);
        printf("\nPlease enter a family name: ");
        scanf("%20s",myStudent->lastName);
        printf("\nEnter number of enrolled classes: ");
        scanf("%d",&myStudent->numClass);
        printf("\nEnter students GPA: ");
        scanf("%d",&myStudent->GPA);
        printf("\nEnter tuition Fee: ");
        scanf("%f",&myStudent->tuitionFees);

       return myStudent;
    }

    void Student_print(Student *who)
    {
        fflush(stdout);
        printf("First Name: %s\n, ",who->firstName);
        printf("Last Name: %s\n", who->lastName);
        printf("\tTuition Fees: %f\n, ",who->tuitionFees);
        printf("Number of Courses: %d\n , ",who->numClass);
        printf("GPA : %d\n, ",who->GPA);
    }

我尝试访问它的主文件标记为col_personal.c

int main(int argc, char *argv[])
    {

        //This is for the input
        int choice;
        mainMenu();


        return 0;
    }




void mainMenu()
{
    int choice = 0;
    Student class[10];
    int ssize = 0;
    while(choice != 10){
    printf("\n\n\n\t\t\t====School Database====\n");
        printf(" 1. Add a new record\n");
        printf(" 2. Print Students.\n");
        scanf("%d",&choice);

        //CHOICE ADD NEW RECORD.
        if(choice == 1)
        {

        printf("1.Student\n");
        fflush(stdin);
        scanf("%d",&choice);
            if(choice == 1){
            printf("How many students would you like to input? ");
            scanf("%d",&choice);
            //Creates Students
                for(int i=0; i<choice;i++){
                    class[i] = Student_create();
                    ssize = ssize + 1;
                }

            }


        //PRINTING STUDENTS CHOICE 2
        } else if (choice == 2){
            for(int i=0; i < ssize;i++){
                Student_print(class[i]);
            }

Answer 1

分段falut是由于没有指针的内存分配

char *firstName; char *lastName;

这些只是指向任何有效内存位置的指针。使用 pointer = malloc(<number of character to store> * sizeof(char));

同时释放分配的内存，以避免内存泄漏。

打印结构对象时出现分段错误

1 个答案: