What is the difference between initialization and declaration




















Thanks for these answers. This was helpful for me. That note here helped me a lot. Posting to the forum is only allowed for members with active accounts. Please sign in or sign up to post. Welcome to the Treehouse Community The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support.

Looking to learn something new? Sindya Darman 1, Points. You can initialize the variable by specifying an equal sign and a value. Keep in mind You can initialize the variable by specifying an equal sign and a value.

Keep in mind that the initialization expression must result in a value of the same or compatible type as that specified for the variable. To declare more than one variable of the specified type, use a comma-separated list.

Point To remember Variables should be declared in the C program before to use. Memory space is not allocated for a variable while declaration. It happens only on the variable definition. Variables and data structures must be defined and initialized before they can be used to store data. This chapter describes how to declare and initialize them. It includes topics on using define statements, using typedef , creating function prototypes, initializing variables, initializing data structures, and using standard variables.

A define statement is a directive that sets up constants at the beginning of the program. A define statement always begins with a pound sign. All business functions include the system header file: jde. System-wide define statements are included in the system header file.

If you need define statements for a specific function, include the define statement in uppercase letters within the source file for the function whenever possible. The statement should directly follow the header file inclusion statement.

Usually, you should place define statements in the source file, not the header file. When placed in the header file, you can redefine the same constant with different values, causing unexpected results. However, rare cases exist when it is necessary to place a define statement in the function header file. In these cases, precede the definition name with the business function name to ensure uniqueness.

This example includes define statements within a business function source file:. When using typedef statements, always name the object of the typedef statement using a descriptive, uppercase format. If you are using a typedef statement for data structures, remember to include the name of the business function in the name of the typedef to make it unique.

See the example for using a typedef statement for a data structure. This is an example of a user-defined data structure:. Always place function prototypes in the header file of the business function in the appropriate prototype section. Include function definitions in the source file of the business function, preceded by a function header. Ensure that variable names in the parameter list follow the naming convention defined in this guide.

List the variable names of the parameters along with the data types in the function prototype. Do not allow the parameter list to extend beyond 80 characters in the function definition.



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