Cranberry Pineapple Salad

1 pound cranberries (chopped)
1 cup crushed pineapple (drained)
1 cup sugar
1 cup miniature marshmallows
1 cup cool whip or whipping cream

Combine cranberries, pineapple and sugar. Let stand at room temperature over night. Add the marshmallows and cool whip/whipping cream just before serving.