第三周作业

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#include<iostream>#include<iomanip>using namespace std;int main(){bool flag=true;cout<<flag<<endl;cout<<boolalpha<<flag<<endl;cout<<flag+5<<endl;flag=0;cout<<"执行语句flag=0;后flag的值为:"<<boolalpha<<flag<<endl;flag=0.0;cout<<"执行语句flag=0.0;后flag的值为:"<<boolalpha<<flag<<endl;return 0;}

#include<iostream>using namespace std;int main(){int a,b,c,d;a=4;b=a;a=5;c=d=6;c*=a;d%=a+b;cout<<"a="<<a<<endl<<"b="<<b<<endl<<"c="<<c<<endl<<"d="<<d<<endl;return 0;}

#include<iostream>using namespace std;int main(){short i,j,m,n;i=1000;j=1000;m=i+j;n=i*j;cout<<"m="<<m<<endl;cout<<"n="<<n<<endl;return 0;}

#include<iostream>using namespace std;int main(){int i=6,j,k;j=++i;k=i++;++i=1;cout<<"i="<<i<<endl<<"j="<<j<<endl<<"k="<<k<<endl;return 0;}

#include<iostream>using namespace std;int main(){char ch;cout<<"please input a character:";cin>>ch;ch=ch>='a'&&ch<='z'?ch-'a'+'A':ch;//上述语句等价于ch=ch>='a'&&ch<='z'?ch-32:ch;cout<<"The result is:"<<ch<<endl;return 0;}

#include<iostream>using namespace std;int main(){char ch='c';int a,b=13;float x,y;x=y=2.0;a=ch+5;x=b/2/x;y=b/y/2;}

#include<iostream>using namespace std;int main(){int ab,ac;double b=3.14;char c='A';ab=int (b);ac=int (c);cout<<"b="<<b<<endl;cout<<"ab="<<ab<<endl;cout<<"c="<<c<<endl;cout<<"ac="<<ac<<endl;return 0;}

/*三角形的周长和面积*/#include<iostream>#include<math.h>       //调用包含有数学函数的头文件using namespace std;int main(){float a,b,c,q,w,s;     //输入变量    cout<<"输入三角形的三条边长："<<endl;cin>>a>>b>>c;if(a+b>c&b+c>a&a+c>b)    //p判断能否形成三角形{q=(a+b+c)/2;s=sqrt((q-a)*(q-b)*(q-c)*q);        w=a+b+c;    cout<<"周长="<<w<<endl;cout<<"面积="<<s<<endl;    return 0;}elsecout<<"无结果"<<endl;}

#include<iostream>#include<math.h>using namespace std;int main(){int e=1,f=4,g=2;float m=10.5,n=4.0,k;k=(e+f)/g+sqrt((double)n)*1.2/g+m;cout<<"k的值为="<<k<<endl;return 0;}

/*******习题3.2******/#include<iostream>using namespace std;int main(){float x=2.5,y=4.7,k;int a=7;k=x+a%3*(int(x+y)%2)/4;cout<<"k="<<k<<endl;return 0;}

#include<iostream>#include<math.h>using namespace std;int main(){float a,b,c,k1,k2,deta;cout<<"输入二元一次方程的系数:"<<endl;cin>>a>>b>>c;deta=b*b-4*a*c;if(deta>=0){k1=(-b+sqrt(deta))/2*a;k2=(-b-sqrt(deta))/2*a;cout<<"k1="<<k1<<endl;cout<<"k2="<<k2<<endl;return 0;}elsecout<<"无解"<<endl;}

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