获取错误 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 行和第 25 行收到 error C2440: 'function': cannot convert from 'double' to 'char*'。

我认为这与我尝试用于 gpa 和学分的双倍有关。我不明白为什么它会影响这些线条。

Answer 1

您不能使用：

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

因为 Student.StudentGPA 和 Student.StudentCredits 的类型是 double。

使用：

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

顺便说一句，行

strcpy(Student.StudentMajor, "TECH");

将导致未定义的行为，因为 Student.StudentMajor 没有足够的 space 来保存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。

获取错误 C2440

Getting error C2440

c

compiler-errors