Exemplo n.º 1
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 public PrimitiveCalculator(IStartegy strategy) //II-way to set operator. Just add in defald startegy when  I make instance.
 {
     this.strategy = strategy;
 }
Exemplo n.º 2
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 public void ChangeStrategy(char @operator)
 {
     this.strategy = this.strategies[@operator];
 }
Exemplo n.º 3
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 public PrimitiveCalculator()
 {
     this.strategy = this.strategies['+'];
 }