第2周项目3-小试循环

（1）

问题描述：求1到m的平方和

#include <iostream>using namespace std;int main()
{int i,sum=0,m;cin>>m;for(i=1;i<=m;i++)sum = sum + i*i;cout<<sum<<endl;return 0;
}

知识点总结：从这个程序中，进一步巩固了对简单程序结构的认识，也学会了利用输入的结果的方法。
学习心得：一开始写程序，将endl后面的分号写成了汉字标点，于是一番纠结。等把这些错误积累起来。遇到错误不慌张在错误中成长，我能行

（2）

问题描述：求1到m所有奇数的和

#include <iostream>using namespace std;int main()
{int i,sum=0,m;cin>>m;for(i=1;i<=m;i=i+2){sum = sum + i;}cout<<sum<<endl;return 0;
}

（3）

问题描述：求1到m的倒数和

#include <iostream>using namespace std;int main()
{int m;double i,sum=0;cin>>m;for(i=1;i<=m;i++){sum = sum + 1/i;}cout<<sum<<endl;return 0;
}
<!--StartFragment --><div>
<img src="data:image/png;base64,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" alt="" />
</div>

(4)

问题描述：求1-1/2+1/3-1/4+...+(-1)m1/m

#include <iostream>using namespace std;int main()
{int m,s=-1;double i,sum=0;cin>>m;for(i=1;i<=m;i++){s=-s;sum = sum +s* 1/i;}cout<<sum<<endl;return 0;
}
<!--StartFragment --><div>
<img src="data:image/png;base64,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" alt="" />
</div>

(5)

问题描述：求m!

#include <iostream>using namespace std;int main()
{int m,i,sum=1;cin>>m;for(i=1;i<=m;i++){sum = sum *i;}cout<<sum<<endl;return 0;
}<!--StartFragment --><div>
<img src="data:image/png;base64,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" alt="" />
</div>

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