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C++ 谢谢。。。。。
Activity 7 Write a program that asks the user to enter a lowercase letter and determines whether or
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C++的新手，真心谢谢你们的帮助了。
Activity 6 Write a program that asks the user for a number representing the day of the week and prin
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C++新手题，谢谢帮忙
Activity 4 Write a program to calculate the roots of a quadratic equation. A quadratic equation is a
