第四周作业

来源：互联网发布：四选一数据选择器例题编辑：程序博客网时间：2024/05/21 10:18

求自然对数

# include <iostream>using namespace std;int main(){int i=0;double value=1,fac=1;while (fac>10e-6){i++;fac=fac/i;value+=fac;}cout<<"e= "<<value<<endl;return 0;}

求圆周率

# include <iostream>using namespace std;int main(){int i;double pi=0,fac=1;for(i=1;i<10e6;i+=2){pi+=4*(double)1/i*fac;fac*=-1;}cout<<"pi约等于:"<<pi<<endl;return 0;}

作业习题7

# include <iostream>using namespace std;int main(){int num;cout<<"请输入一个数:"<<endl;cin>>num;if(num<10)cout<<num<<" is less than 10."<<endl;else if(num>=10&&num<100)cout<<num<<" is 10 to 100."<<endl;else if(num>=100&&num<=1000)cout<<num<<" is 100 to 1000."<<endl;else cout<<num<<" is greater than 1000."<<endl;return 0;}

作业习题8

不会做

习题9

# include <iostream>using namespace std;int main(){int n=0,s=0;while(s<=1000){n++;s+=n*n;}cout<<"满足条件的最大值";cout<<"n="<<n<<endl;return 0;}

习题10

# include <iostream>using namespace std;int main(){int i=0;long unsigned int x1=0;double x2=0,s=0.01;while(i!=30){i++;x1+=100000;s=s*2;x2+=s;}cout<<"一个月后，"<<endl;cout<<"陌生人给了富翁"<<x1<<"元钱"<<endl;cout<<"百万富翁给了陌生人"<<fixed<<x2<<"元钱"<<endl;return 0;}

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