Texas Instruments TINSPIRE Teacher Software Guidebook - Page 708

To test for each option (If Choice=1, If Choice=2, and so on), use the If...Then...ElseIf...EndIf structure. Lbl and Goto commands You can also control the flow by using Lbl (label) and Goto commands. These commands reside on the Program Editor's Transfers menu. Use the Lbl command to label (assign a name to) a particular location in the function or program. Lbl labelName name to assign to this location (use the same naming convention as a variable name) You can then use the Goto command at any point in the function or program to branch to the location that corresponds to the specified label. Goto labelName specifies which Lbl command to branch to Because a Goto command is unconditional (it always branches to the specified label), it is often used with an If command so that you can specify a conditional test. For example: If x>5 Goto GT5 À Disp x -------- -------- Á Lbl GT5 Disp "The number was > 5" À If x>5, branches directly to label GT5. Á For this example, the program must include commands (such as Stop) that prevent Lbl GT5 from being executed if x{5. Using loops to repeat a group of commands To repeat the same group of commands successively, use one of the loop structures. Several types of loops are available. Each type gives you a different way to exit the loop, based on a conditional test. 696 Programming