C语言 错误：数组类型具有不完整的元素类型和二进制操作数错误
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Error: Array type has incomplete element type and binary operand error
提问by Nithin Kumar
I am trying to make a multi-program database in C.
我正在尝试用 C 制作一个多程序数据库。
Here is the code:
这是代码：
#include<stdio.h>
#include<stdlib.h>
#include "function.c"
int main()
{
info();
example();
printf("\n\n\n");
char name[1][10], id[1][10], grade[1][1];
char choice;
int x=0;
int sal[1];
FILE *fp;
printf("Would you like to continue? Y/N: ");
scanf("%c",&choice);
fflush(stdin);
if(choice == 'Y' || choice == 'y')
{
system("cls");
fp = fopen("database.txt","w");
if(fp == NULL)
{
printf("File does not exist!");
return 0;
}
else
{
while(x<=1)
{
printf("Enter Employee name no.%d: ",(x+1));
scanf("%s",name[x]);
fprintf(fp, "Employee Name: %s\n",name);
printf("Enter Employee ID: ");
scanf("%s",id[x]);
fprintf(fp, "Employee ID: %s\n",id);
printf("Enter Employee Grade Level (A-E): ");
scanf("%s",grade[x]);
fprintf(fp, "Employee Grade Level: %s\n",grade);
printf("Enter Employee's Basic Salary: ");
scanf("%d",&sal[x]);
fprintf(fp, "Employee's Basic Salary: %d\n\n\n",sal);
printf("Employee's bonus: %d\n",bonus(grade[x],sal[x]));
printf("Employee's allowance: %d\n",allowance(grade[x], sal[x]));
printf("\n");
}
}
fclose(fp);
}
else
{
return 0;
}
return 0;
}
function.c :
函数.c：
#include<stdio.h>
#include "function.h"
int bonus(char *grade[1][], int *sal[])
{
int bonus;
int *b;
int x;
b = &bonus;
for(x=0;x<=1;x++)
{
switch(*grade[x])
{
case 'A':
bonus = (1/4) * *sal[x];
break;
case 'B':
bonus = (1/5) * *sal[x];
break;
case 'C':
bonus = (15/100) * *sal[x];
break;
case 'D':
bonus = (1/10) * *sal[x];
break;
case 'E':
bonus = (5/100) * *sal[x];
break;
default:
printf("Invalid Choice!!");
break;
}
return bonus;
}
}
int allowance(char *grade[1][], int *sal[])
{
int all;
int *a;
int x;
a = &all;
for(x=0;x<=1;x++)
{
switch(*grade[x])
{
case 'A':
all = (3/10) * *sal[x];
break;
case 'B':
all = (6/25) * *sal[x];
break;
case 'C':
all = (9/50) * *sal[x];
break;
case 'D':
all = (3/25) * *sal[x];
break;
case 'E':
all = (3/50) * *sal[x];
break;
default:
printf("Invalid Choice!!");
break;
}
return all;
}
}
function.h:
函数.h：
#ifndef _FUNCTION_H_INCLUDED
#define _FUNCTION_H_INCLUDED
int bonus(char *grade[][], int *sal[]); //prototype for calculating bonus
int allowance(char *grade[][], int *sal[]); //prototype for allowance
void info(); //prototype for information
void example(); //prototype for example
#endif
When I try to compile the program, I get:
当我尝试编译程序时，我得到：
2 0 function.c In file included from function.c
4 17 function.h [Error] array type has incomplete element type
5 21 function.h [Error] array type has incomplete element type
4 17 function.c [Error] array type has incomplete element type
function.c In function 'bonus':
18 19 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
21 19 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
24 22 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
27 20 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
30 21 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
function.c At top level:
41 21 function.c [Error] array type has incomplete element type
function.c In function 'allowance':
54 17 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
57 17 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
60 17 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
63 17 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
66 17 function.c [Error] invalid operands to binary * (have 'int' and 'int *')
I do not know what the problem is (I'm a beginner in C programming).
我不知道问题是什么（我是 C 编程的初学者）。
My first question: What does array type has incomplete element type mean? Next question: Why am I still getting the invalid operands to binary * error?
我的第一个问题：数组类型具有不完整的元素类型是什么意思？下一个问题：为什么我仍然将无效的操作数变为二进制 * 错误？
Any help would be appreciated.
任何帮助，将不胜感激。
回答by bhathiya-perera
for "My first question: What does array type has incomplete element type mean?"
对于“我的第一个问题：数组类型具有不完整的元素类型是什么意思？”
this error occur because in c language you need to specify the array size if you are not declaring it like
发生此错误是因为在 c 语言中，如果您没有像这样声明数组大小，则需要指定数组大小
int arr[] = {6,1,2,3};
int arr[] = {6,1,2,3};
otherwise
除此以外
it should be int arr[<size of the array>];
它应该是 int arr[<size of the array>];
for invalid operands to binary * error?
对于二进制 * 错误的无效操作数？
it occurs because you are trying to multiply intand int *values
它发生是因为你试图乘以int和int *值
consider seeing this http://forums.devshed.com/c-programming-42/dynamic-arrays-with-undeclared-size-62036.html
考虑看看这个http://forums.devshed.com/c-programming-42/dynamic-arrays-with-undeclared-size-62036.html
and read some more tutorials about pointers and arrays and how to mix them
并阅读更多关于指针和数组以及如何混合它们的教程
回答by Jonathan Leffler
In the declarations in function.h, you have:
在 中的声明中function.h，您有：
int bonus(char *grade[][], int *sal[]);
You can't leave out all the dimensions; you have to specify a number for every dimension of an array except, perhaps, the first. For example, this might be legitimate:
你不能遗漏所有的维度；您必须为数组的每个维度指定一个数字，也许除了第一个维度。例如，这可能是合法的：
int bonus(char *grade[][20], int *sal[]);
I've not checked whether 20 is the appropriate number, but some number must be used in the context.
我没有检查 20 是否是合适的数字，但必须在上下文中使用一些数字。
This is causing the 'incomplete array type' message.
这会导致“不完整的数组类型”消息。
