In a switch statement, why are all the cases being executed?

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It’s a bug in your code. You forgot to put in a break after each case:

switch (day % 10) {
    case 1: ordinalBuilder.append("st"); break;
    case 2: ordinalBuilder.append("nd"); break;
    case 3: ordinalBuilder.append("rd"); break;
    default: ordinalBuilder.append("th"); break;
}

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