C++的循环结构，不知道如何使用循环结构语句，求指教

Question

数字1到20偶数累加，奇数相乘，用while,for语句编写，结果显示出偶数和，奇数积

Answer 1

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Answer 2

你要自己动脑想 不要老是看别人的代码要靠自己的能力自己去尝试哪怕想了很长的时间要不你不会提升自己编程能力的