Consider the following C switch statement: switch (i) { case 15: week = 3; day =

Question

Consider the following C switch statement:

switch (i) {
   case 15: week = 3; day = 1; break;
   case 16: week = 3; day = 2; break;
   case 17: week = 3; day = 3; break;
   case 18: week = 3; day = 4; break;
   case 19: week = 3; day = 5; break;
   case 20: week = 3; day = 6; break;
   case 21: week = 3; day = 7; break;
   case 22: week = 4; day = 1; break;
   case 23: week = 4; day = 2; break;
   case 24: week = 4; day = 3; break;
   case 25: week = 4; day = 4; break;
   case 26: week = 4; day = 5; break;
   case 27: week = 4; day = 6; break;
   case 28: week = 4; day = 7; break;
   case 29: week = 5; day = 1; break;
   case 30: week = 5; day = 2; break;
   case 31: week = 5; day = 3; break;
}

Would it make sense to use a jump table to implement this switch statement? Why
or why not?

Explanation / Answer

Would it make sense to use a jump table to implement this switch statement? Why
or why not?

Answer:

Using a jump table to implement the switch statement is recomended.

If you think about it, it should become apparent that a jump table approach is likely to give a highly consistent time of execution through the decision tree, whereas the if-else -if chain has a highly variable time of execution depending upon the particular value of the switched variable.

Actually I am giving here what is a jump table.

A jump table is a branch table or jump table is a method of transferring program control (branching) to another part of a program (or a different program that may have been dynamically loaded) using a table of branch or jump instructions. It is a form of multiway branch. The branch table construction is commonly used when programming in assembly language but may also be generated by a compiler, especially when implementing an optimized switch statement where known, small ranges are involved with few gaps.

So you can use switch statement.

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