HP 9g hp 9g_user's manual_manuel de l'utilisateur_EF_HDP1SG181S5.pdf - Page 28

⇒ Each program needs an END command to mark the end of the program. This is displayed automatically when you create a new program. Increment and decrement Post-fixed: Memory variable + + or Memory variable - - Pre-fixed: + + Memory variable or - - Memory variable ⇒ A memory variable is decreased or increased by one. For standard memory variables, the + + ( Increment ) and - - ( Decrement ) operators can be either post-fixed or pre-fixed. For array variables, the operators must be pre-fixed. With pre-fixed operators, the memory variable is computed before the expression is evaluated; with post-fixed operators, the memory variable is computed after the expression is evaluated. For loop FOR ( start condition; continue condition; re-evaluation ) { statements } ⇒ A FOR loop is useful for repeating a set of similar actions while a specified counter is between certain values. For example: FOR ( A = 1 ; A ≤ 4 ; A + + ) { C = 3 × A ; PRINT " ANS = " , C } END ⇒ Result : ANS = 3, ANS = 6, ANS = 9, ANS = 12 The processing in this example is: 1. FOR A = 1: This initializes the value of A to 1. Since A = 1 is consistent with A ≤ 4, the statements are executed and A is incremented by 1. 2. Now A = 2. This is consistent with A ≤ 4, so the statements are executed and A is again incremented by 1. And so on. 3. When A = 5, it is no longer true that A ≤ 4, so statements are not executed. The program then moves on to the next block of code. Sleep command SLEEP ( time ) ⇒ A SLEEP command suspends program execution for a specified time (up to a maximum of 105 seconds). This is useful for displaying intermediate results before resuming execution. Swap command SWAP ( memory variable A, memory variable B ) E-28