同济C 课后实验答案.doc

实验1
1-1
#include ""
void main()
{
int x;
cin>>x;
int y=x*x;
cout<<"x*x=="<<hex<<y<<endl;
}
1-2
#include""
void main()
{
double shangdi=,xiadi=210,gao=,s;
s=(shangdi+xiadi)*gao/2;
cout<<"梯形面积为: "<<s<<endl;
}
1-3
#include""
void main()
{ double sub1,sub2,sub3,average;
cout<<"请输入三门课的成绩: ";
cin>>sub1>>sub2>>sub3;
cout<<"平均成绩为: ";
average=(sub1+sub2+sub3)/3;
cout<<average<<endl;
}
1-4
#include ""
#define p 5520
void main()
{
float v,r,m;
cout<<"请输入地球平均半径(单位:Km): ";
cin>>r;
v=4**r*r*r*1000000000/3;
m=v*p;
cout<<"地球重量约为: "<<m<<" Kg"<<endl;
}
实验2
2-1
#include""
void main()
{
float s1,s2,s3;
double aver;
cout<<"输入三个数据::"<<endl;
cin>>s1>>s2>>s3;
aver=(s1+s2+s3)/3;
aver=aver*100+;
aver=(int)aver;
aver=aver/100;
cout<<"平均值="<<aver<<endl;
}
2-2
#include""
#include""
void main()
{
double a,b,c;
cout<<"输入两直角边长a,b:";
cin>>a>>b;
c=sqrt(a*a+b*b);
cout<<"斜边长c为:"<<c<<endl;
}
2-3
#include""
void main()
{
double x,y;
cout<<"输入P点坐标x,y:";
cin>>x>>y;
if ((x*x+y*y>=4) && (x*x+y*y<=16))
cout<<"阴影部面积分为:"<<*4*4-*2*2<<endl;
else
cout<<0<<endl;
}
2-4
#include""
void main()
{
double a,b,c,ave,min;
cout<<"输入三个数a,b,c:";
cin>>a>>b>>c;
ave=(a+b+c)/3;
min=a;
if (b<min) min=b;
if (c<min) min=c;
cout<<"平均值为:"<<ave<<endl;
cout<<"最小值为:"<<min<<endl;
}

2-5
#include""
char change(char c)
{
c=c+3;
if (c>'z') c=c-26;
return(c);
}
void main()
{
char c1='f',c2='l',c3='y';
cout<<change(c1)<<change(c2)<<change(c3)<<endl;
}
实验3
3-1
#include ""
void main()
{
int x,y,r1,r2;
cin>>x>>y;
if(x==0||y==0)
cout<<"input error"<<endl;
else
{
if(x>y)
{
r1=x/y;
r2=x%y;
}
else
{
r1=y/x;
r2=y%x;
}
cout<<"商="<<r1<<"余数="<<r2<<endl;
}
}
3-2
#include""
void main()
{
double time,fee;
cin>>ti