C++经典练习程序代码
#include
main()
{
//用SIZEOF计算常量长度
cout<<"sizeof('$')="< cout<<"sizeof(1)="< cout<<"sizeof(1.5)"< cout<<"sizeof(\"Good!\")="< //sizeof计算变量长度 int i=100; char c='A'; float x=3.1416; double p=0.1; cout<<"sizeof(i)="< cout<<"sizeof(c)="< cout<<"sizeof(x)="< cout<<"sizeof(p)="< //用SIZEOF()计算表达式长度 cout<<"sizeof(x+1.732)="< // cout<<"sizoef(char)="< cout<<"sizoef(int)="< cout<<"sizeof(float)="< cout<<"sizeof(double)="< //用SIZEOF()算数组字节长 char str[]="This is a test"; int a[10]; double xy[10]; cout<<"sizeof(str)="< cout<<"sizeof(a)="< cout<<"sizeof(xy)="< //用SIZEOF 算自定类型字节长 struct st short num; float math_grade; float Chinese_grade; float sum_grade; }; st student1; cout<<"sizeof(st)="< cout<<"sizeof(student)="< #include main()//测试表达式类型转换 { int n=100,m; double x=3.791,y; cout<<"n*x="< //赋值类型转换 m=x; y=n; cout<<"m="< cout<<"y="< //强制转换 cout<<"int(x)="< cout<<"(int)x="<<(int)x< cout<<"int(1.732+x)="< cout<<"(int)1.732="<<(int)1.732< cout<<"double(100)="< //*/ } -----------==================------------------------ #include main() { int score; cout<<"score="; cin>>score; if(score<0||score>100) { cout<<"The score is out of range!"< } else if(score>=90) cout<<"you grage is a A"< else if(score>=80) cout<<"you grade is a B"< else if(score>=70) cout<<"you grade is a C"< else if(score>=60) cout<<"you grade is a D"< else cout<<"you grade is a E"< } #include main() { int x,y,z; char c1; cin>>x>>c1>>y; switch(c1) { case '+':cout< break; case '-':cout< break; case '*':cout< break; case '/':cout< } } ---------------------------======================================= #include main() { // for(int i=1;i<=10;i++) cout< cout< // for(int j=10;j>=1;j--) cout< cout< // for(int k=1;k<=10;k=k+2) cout< cout< // for(char c='A';c<='Z';c++) cout< cout< for(float x=0;x<=1.0;x=x+0.1) cout< cout< // for(float x1=0;x1<=1.0+0.1/2;x1=x1+0.1) cout< cout< // int s=0; for(int n=1;n<=100;n++) s=s+n; cout<<"i="< } cout< } //找出数组最大者，及下标 int h,l,Max=a[0][0]; for (i=0;i<2;i++) for(j=0;j<3;j++) if(Max { Max=a[i][j]; h=i; l=j; } cout<<"Max="<<"a["< return 0; } ---=============================---------------------- #include using namespace std; #define n 8 int main() { //指针与引用的测试 int a,b,c,*ip; // a=100; ip=&a; cout<<"a="< cout<<"*ip="<<*ip< cout<<"ip="< ip=&b; b=200; cout<<"b="< cout<<"*ip="<<*ip< cout<<"ip="< ip=&c; *ip=a+b; cout<<"c="< cout<<"*iP="<<*ip< cout<<"ip="< return 0; } -----------=============================--------------------- #include //#include //using namespace std; int main() { // int i; struct student { int num; char name[20]; float maths; float physics; float chemistry; double total; }; student st[3]; cout<<" num name maths physics chemistry total "< for(i=0;i<3;i++) { cout< cin>>st[i].num; cin>>st[i].name; cin>>st[i].maths; cin>>st[i].physics; cin>>st[i].chemistry; } for(i=0;i<3;i++) st[i].total=st[i].maths+st[i].physics+st[i].chemistry; for(i=0;i<3;i++) { cout<<"st["< cout< cout< cout< cout< cout< cout< } return 0; } ----=============================-------------- #include //#include //using namespace std; int main() { // struct human { char name[10]; int sex; int age; }; struct human x={"WangPing",1,30},*p=&x; cout<<"(*p).name="<<(*p).name< cout<<"(*p).sex="<<(*p).sex< cout<<"(*p).age="<<(*p).age< cout<<"===================="< p=new human; // cout<<"p->name="; cin>>p->name; cout<<"p->sex="; cin>>p->sex; cout<<"p->age="; cin>>p->age; cout< cout<<"p->name="< cout<<"p->sex="< cout<<"p->age="< delete p; return 0; } --------------============================------------ #include main() { struct date { int year; int month; int day; }; struct baby { int num; float weight; date birthday;; }; baby b1={10001,10,{2002,12,25}}; cout<<"b1.num"< cout<<"b1.weight="< cout<<"b1.birthday.year="< cout<<"b1.birthday.month="< cout<<"b1.birthday.day="< cout<<"-------------------"< baby temp; temp=b1; cout<<"temp.num="< cout<<"temp.weight="< cout<<"temp.birthday.year="< cout<<"temp.birthday.month="< cout<<"temp.birthday.day="< } ----------===========================================-------------------- #include main() { int i; struct student { char name[10]; int math; int computer; float sum; student *next; }; struct student *head,*tail,*temp; temp=new struct student;//申请内存 head=temp; tail=head; cout<<"\tname Math Computer "< for(i=0;;i++) { cout< cin>>temp->name; if(temp->name[0]!='*') { cin>>temp->math>>temp->computer; temp->sum=temp->math+temp->computer; temp->next=NULL; tail=temp; } else { delete temp; tail->next=NULL; break; } temp->next=new struct student; temp=temp->next; } // cout<<"-----------------------"< temp=head; while(temp!=NULL) { cout< cout< temp=temp->next; } } ---------==============================================------------------------- //双链表前后篇历算法。 #include main() { int i; struct student { char name[10]; int math; int computer; float sum; student *forw; student *next; }; struct student *head,*tail,*temp; temp=new struct student; head=temp; tail=temp; head->forw=NULL; cout<<"\tname Math Computer"< for(i=1;;i++) { cout< cin>>temp->name; if(temp->name[0]!='*') { cin>>temp->math>>temp->computer; temp->sum=temp->math+temp->computer; temp->next=NULL; tail=temp; } else { delete temp; tail->next=NULL; break; } temp->next=new struct student; temp->next->forw=temp; temp=temp->next; } cout<<"head---------tail:"< temp=head; while(temp!=NULL) { cout< cout< temp=temp->next; } cout<<"tail------------>head:"< temp=tail; while(temp!=NULL) { cout< cout< temp=temp->forw; } } -----=================================------------------------------- //UNION联合应用, 联合内各元素，点用同一内存空间， #include main() { int i; union utag { char c; int k; float x; }; utag u; u.c='*'; cout<<"u.c="< u.k=1000; cout<<"u.k="< u.x=3.1416; cout<<"u.x="< utag u1={'A'}; cout<<"sizeof(u1)="< cout<<"sizeof(utag)="< cout<<"u1.c="< cout<<"u1.k="< cout<<"u1.x="< -----------=======================================-------------- #include struct student { int num; char name[20]; float grade; }; void main() { int i,size; char str[]="This a string."; int int_values[]={51,23,2,44,45,0,11}; float float_values[]={5.1,13.3,22.2,10.4,1.5}; student st_arr[]={101,"WangLin",92,102,"LiPing",85,103,"ZhaoMin",88}; size=sizeof(str)/sizeof(char); cout<<"Number of elements in str:"; cout< for(i=0;i { cout< } cout< //float size=sizeof(float_values)/sizeof(float); cout<<"Number of elements in float_value:"; cout< for(i=0;i { cout< } cout< // size=sizeof(st_arr)/sizeof(student); cout<<"Number of element in st_arr:"; cout< for(i=0;i { cout< cout< cout< } } -------------===============================================---------------------- //自定函数应用 #include double add(double x,double y) { double z; z=x+y; cout<