What is the difference between variable declaration and variable definition? What is variable initialization and why is it important? What is wrong with this program statement? Is this program statement valid? Select Chapter. The identifier is the name of the variable.
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.
When you declare a variable, you should also initialize it. Two types of variable initialization exist: explicit and implicit. Variables are explicitly initialized if they are assigned a value in the declaration statement. Implicit initialization occurs when variables are assigned a value during processing. This information covers standards for declaring and initializing variables in business functions and includes an example of standard formats.
Declare all variables used within business functions and internal functions at the beginning of the function. Although C allows you to declare variables within compound statement blocks, this standard requires all variables used within a function to be declared at the beginning of the function block. Declare only one variable per line, even if multiple variables of the same type exist. Indent each line three spaces and left align the data type of each declaration with all other variable declarations.
Align the first character of each variable name variable name in the preceding format example with variable names in all other declarations. Use the naming conventions set forth in this guide. When initializing variables, the initial value is optional depending on the data type of the variable. Generally, all variables should be explicitly initialized in their declaration. The descriptive comment is optional.
In most cases, variable names are descriptive enough to indicate the use of the variable. However, provide a comment if further description is appropriate or if an initial value is unusual. Data structures should be initialized to zero using the memset function immediately after the declaration section.
Always initialize pointers to NULL and include an appropriate type call at the declaration line. Ensure that the byte size of the variable matches the size of the data structure you want to store. Always memset to NULL on the data structure that is passed to another business function to update a table or fetch a table. This example resets the data structure to NULL when initializing the data structure:.
Business functions frequently return error codes and pointers. The input and output parameters in the business function data structure should be named as follows:.
Use fetch variables to retrieve and return specific information, such as a result; to define the table ID; and to specify the number of keys to use in a fetch. Ensure that function names follow the naming convention defined in this guide. List one parameter per line so that the parameters are aligned in a single column. Left align all comments. Initialize all variables, except data structures, in the declaration.
Use input and output parameters. Use fetch variables. If the value is 0, display the error. Otherwise, return four spaces.
Do not put the literal value in the API functions as the parameter. Based on cCallType, cErrorCode returns a 1 when it fails or a 0 when it succeeds. If the value is 1, do not display error message using jdeErrorSet
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