if only conditional

Overview#if/#endif statements are commonly used to generate different compilation results based on the same source code, the most common of which is the debug and release versions. However, these tools are not very friendly in practical applications

4.2 Item Selection Statements"Teacher, did I pass the level four exam?" ”If the teacher is asked this question, how will he answer? Yes, he will choose different answers according to different conditions:If the test result is greater than or equal

4.2 Item Selection Statements"Teacher, did I pass the level four exam?" ”If the teacher is asked this question, how will he answer? Yes, he will choose different answers according to different conditions:If the test result is greater than or equal

Simplified condition expression 1. Decompose Conditional decomposition condition expression You have a complex conditional statement.Separate independent functions from the if, then, and else sections.. Among programs, complex conditional logic is

If statement The IF statement can be used to form a branch structure that is judged according to the conditions given to determine which branch segment to execute. There are three basic forms of if statements in C language The first form of:

"Conditional judgment"1. Judging by file type-B file to determine if the file exists and is a block device file (is a block device file is true)-c file to determine if the file exists and is a character device file (the character device file is true)

Program flow control Statements in Java include conditional structure, loop structure, and jump statements4.1-Piece structureThe conditional structure includes the sequential structure and the selection structure. The sequential structure does not

3 forms of an IF statement 1 an if (expression) statement. For example: if (x>y) cout The execution of this if statement is shown in the following figure. 2 if (expression) statement 1 Else Statement 2 For example: if (x>y)

Conditional compilation and c ++ Conditional compilation 1. ifdef #ifdef XXXXX......#endifIf XXXXX is defined, compile the above Code. 2. ifndef #ifndef XXXXX......#endifIf XXXXX is not defined, compile the above Code. 3. if #if

Some programs are debugging, compatibility, in situations like platform porting, you might want to generate a different software by simply setting some parameters, which, of course, can be done with variable settings, write all the possible code,