C:\Users\lj\Desktop\课上\emp.o emp.c:(.data+0x0): multiple definition of `test'

This error message indicates that there are multiple definitions of the variable or function named "test" in your program. This can happen if you have accidentally included the same source file multiple times, or if you have defined the variable or function in multiple source files without properly declaring it as extern. To fix this error, you need to identify where the duplicate definitions are and remove or properly declare them.

相关问题

332 8 C:\Users\lj\Desktop\课上\emp.c [Error] conflicting types for 'getEmpYpaid'

This error message means that there are two or more functions or variables with the same name but different data types. In this case, the function "getEmpYpaid" has been declared with one data type but later defined with a different data type.

To fix this error, make sure that the function declaration and definition have the same data type. Check for any other functions or variables with the same name and ensure that they have different names or are declared and defined with the same data type.

MySql.Data.MySqlClient.MySqlException:“Table 'test11.emp' doesn't exist”

这个错误是由于在数据库中找不到名为'test11.emp'的表所引起的。请确保表名和数据库名称是正确的，并且表已经在数据库中创建。你可以使用以下命令来创建表：

CREATE TABLE test11.emp (
    id INT PRIMARY KEY,
    name VARCHAR(50),
    age INT,
    salary DECIMAL(10,2)
);

确保在创建表之前已经创建了名为'test11'的数据库。如果问题仍然存在，请检查连接字符串和数据库权限是否正确。