Case Statements

by Online Tutorials Library July 14, 2022

Case Statements

Switch and case statement is available in a variety of languages. The syntax of case statement is as follows:

      switch E                  begin                                case V1: S1                               case V2: S2                               .                               .                           .  case Vn-1: Sn-1  default: Sn                  end  

The translation scheme for this shown below:

Code to evaluate E into T

  goto TEST                  L1:         code for S1                                goto NEXT                  L2:         code for S2                                goto NEXT                                .                                .                                .                  Ln-1:      code for Sn-1                                goto NEXT                  Ln:         code for Sn  goto NEXT                  TEST:      if T = V1 goto L1                                      if T = V2goto L2                                 .                                 .                                 .                                 if T = Vn-1 goto Ln-1                                 goto   NEXT:  

When switch keyword is seen then a new temporary T and two new labels test and next are generated.
When the case keyword occurs then for each case keyword, a new label Li is created and entered into the symbol table. The value of Vi of each case constant and a pointer to this symbol-table entry are placed on a stack.

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Case Statements

Case Statements

Code to evaluate E into T

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