得到错误C2440

Question

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

struct student
{
char StudentName[50];
char StudentMajor[4];
double StudentGPA;
double StudentCredits;
char StudentID[9];
};

void main()
{
struct student Student;

strcpy(Student.StudentName, "Christian Gigliotti");
strcpy(Student.StudentMajor, "TECH");
strcpy(Student.StudentGPA, "2.4");
strcpy(Student.StudentCredits, "31");
strcpy(Student.StudentID, "J02062414");

printf("Student's Name: %s\n", Student.StudentName);
printf("Student's Major: %s\n", Student.StudentMajor);
printf("Student's GPA: %d\n", Student.StudentGPA);
printf("Student's Credits Earned: %d\n", Student.StudentCredits);
printf("Student's ID: %s\n", Student.StudentID);

return 0;
}

我在第24和25行得到error C2440: 'function': cannot convert from 'double' to 'char*'。

我认为这与我试图用于gpa＆amp;的双重问题有关。学分。我不明白为什么它会影响那些线条。

Answer 1

你不能使用：

strcpy(Student.StudentGPA, "2.4");
strcpy(Student.StudentCredits, "31");

因为Student.StudentGPA和Student.StudentCredits属于double类型。

使用：

Student.StudentGPA = 2.4;
Student.StudentCredits = 31;

BTW，该行

strcpy(Student.StudentMajor, "TECH");

将导致未定义的行为，因为Student.StudentMajor没有足够的空间来容纳这些字符和终止空字符。使Student.StudentMajor的大小至少为5。

strcpy(Student.StudentID, "J02062414");

遇到同样的问题。使Student.StudentID的大小至少为10。