In a switch case statement, it says “duplicate case value” comes up as an error. Anyone know why?

Question

I am working on a rock paper scissors program, but this time the computer chooses rock half the time, scissors a third of the time, and paper only one sixth of the time. The

Answer 1

The expression used in the switch statement must be integral type ( int, char and enum). In the Switch statement, all the matching case execute until a break statement is reached and Two case labels cannot have the same value.

But in the above case with logical or condition. At first case: rock1 || rock2 || rock3: This will evaluate to 1 and second case scissors1 || scissors2: will also evaluate to 1. This is cause error as said Two case labels cannot have the same value.

This is the reason compiler complains and giving an error:

Compiler Error: duplicate case value

To solve this convert to

switch(computer) {
        case rock1: 
        case rock2:  
        case rock3:
            c = 1;
            break;
        case scissors1:
        case scissors2: //Now will not give any error here...
            c = 3;
            break;
        case paper:
            c = 2;
            break;
    }