Share cho khóa 4 học C++ chuẩn bị kiểm tra giữa kì
Con trỏ kí tự - full:
Mã:
#include <iostream>
#include <string>
using namespace std;
void nhap(char *p)
{
cout<<"Nhap xau..."<<endl;
gets(p);
}
void xuat(char *p)
{
cout<<"Xuat..."<<endl;
cout<<p;
}
void xuatnguoc(char *p)
{
for(int i=strlen(p)-1;i>=0;i--)
{
cout<<*(p+i);
}
}
void demkitu(char *p)
{
int dem=0;
for(int i=0;i<strlen(p);i++)
if(*(p+i)==' ' || *(p+i)==NULL) dem+=1;
cout<<"\n So ki tu :"<<strlen(p)-dem;
}
void demtu(char *p)
{
int demtu=0, i=0;
while(i<strlen(p))
{
if(*(p+i)==' ')
{
i++;
continue;
}
else
{
while(*(p+i)!=' ')
{
i++;
}
demtu++;
}
}
cout<<"\n So tu:"<<demtu;
}
void hoa_thuong(char *p)
{
int hoa=0; int thuong=0;
for(int i=0;i<strlen(p);i++)
{
if(*(p+i)==toupper(*(p+i)) && *(p+i)!=' ') hoa+=1;
if(*(p+i)==tolower(*(p+i)) && *(p+i)!=' ') thuong+=1;
}
cout<<"\n So ki tu hoa :"<<hoa<<endl;
cout<<"So ki tu thuong :"<<thuong<<endl;
}
void chuyen(char *p)
{
for(int i=0;i<strlen(p);i++)
*(p+i)=toupper(*(p+i));
cout<<"Chuoi hoa..."<<p;
}
/*
bool check(const char *str1, const char *str2)
{
if (strstr(str1,str2)) return true;
return false;
}*/
void del_space(char *p)
{
for(int i=0;i<strlen(p);i++)
{
if(*(p+i)==' ')
for(int j=i;j<strlen(p);j++)
*(p+j)=*(p+j+1);
i--;
}
cout<<p;
}
void main()
{
char *p;char *x;
x=new char[100];
p=new char[100];
nhap(p);
xuat(p);
cout<<"Xuat nguoc \n"<<endl;
xuatnguoc(p);
demkitu(p);
demtu(p);
hoa_thuong(p);
chuyen(p);
cout<<endl;
del_space(p);
}
Mảng 2 chiều:
- Nhập, xuất
- Phần tử chẵn, tb các phần tử
- Tổng các phần tử trên hàng/cột/đường chéo chính/ phụ
- Kiểm tra đối xứng
Mã:
#include <iostream>
using namespace std;
void main()
{
int a[10][10];
int m,n,i,j;
//Nhap, xuat mang 2 chieu
cout<<"Nhap so hang, so cot (m,n)"<<endl;
cin>>m>>n;
cout<<"Nhap gia tri pt mang"<<endl;
for(i=0;i<m;i++)
for(j=0;j<n;j++)
{
cout<<"a["<<i+1<<"]["<<j+1<<"]=";
cin>>a[i][j];
}
cout<<"Gia tri vua nhap"<<endl;
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
cout<<a[i][j]<<"\t";
}
cout<<endl;
}
cout<<endl;
//Cac phan tu chan
cout<<"Cac phan tu chan"<<endl;
for(i=0;i<m;i++)
for(j=0;j<n;j++)
{
if(a[i][j]%2==0) cout<<"a["<<i+1<<"]["<<j+1<<"]="<<a[i][j]<<"\t";
}
cout<<endl;
//Trung binh cong cac phan tu
float t=0;float tb;
for(i=0;i<m;i++)
for(j=0;j<n;j++)
t+=a[i][j];
tb=t/(m*n);
cout<<"TB cac phan tu = "<<tb<<endl;
//Tong cac phan tu tren tung hang
cout<<"Tong cac phan tu tren tung hang"<<endl;
int tong[10];
for(i=0;i<m;i++)
{
tong[i]=0;
for(j=0;j<n;j++)
{
tong[i]+=a[i][j];
}
}
for(i=0;i<m;i++)
cout<<"Hang "<<i+1<<" = "<<tong[i]<<endl;
//Tong cac phan tu tren tung cot
cout<<"Tong cac phan tu tren tung cot"<<endl;
for(j=0;j<n;j++)
{
float tongc=0;
for(i=0;i<m;i++)
tongc+=a[i][j];
cout<<"\nCot"<<j+1<<" la: "<<tongc<<endl;
}
//Tong duong cheo chinh, duong cheo phu (m=n)
if(m!=n) cout<<"Ko phai ma tran vuong";
else
{
//Duong cheo chinh
int dcc=0;
for(i=0;i<m;i++)
dcc+=a[i][i];
cout<<"Tong duong cheo chinh la: "<<dcc<<endl;
//Duong cheo phu
int dcf=0;
for(i=0;i<m;i++)
for(j=0;j<n;j++)
if(i==n-1-j)
dcf+=a[i][j];
cout<<"Tong duong cheo phu la:"<<dcf<<endl;
}
//Ma tra doi xung
int k;
for(i=0;i<m;i++)
for(j=0;j<n;j++)
{
if(a[i][j]==a[j][i]) k=1;
else k=0;
}
if(k==1) cout<<"Ma tran doi xung";
else cout<<"ma tran khong doi xung";
}
Trộn mảng, sắp xếp:
Mã:
#include <iostream>
#define max 100
using namespace std;
//Nhap
void nhap(int a[], int n)
{
for(int i=0;i<n;i++)
cin>>a[i];
}
//Xuat
void xuat(int a[], int n)
{
for(int i=0;i<n;i++)
cout<<a[i]<<"\t";
}
//Tron
void tron(int a[],int b[],int c[], int n, int m)
{
for (int i=0;i<n;i++)
{
c[i]=a[i];
}
i=n;
for (int j=0;j<m;j++)
{
c[i+j]=b[j];
}
}
//Sap xep
void sapxep(int a[], int n)
{
for(int i=0;i<n-1;i++)
for(int j=i+1;j<n;j++)
if(a[i]>a[j])
{
int temp=a[i];
a[i]=a[j];
a[j]=temp;
}
}
void main()
{
int a[max], b[max], c[max];
int n1,n2;
cout<<"Nhap so phan tu mang 1"<<endl;
cin>>n1;
cout<<"Nhap gia tri phan tu mang 1"<<endl;
nhap(a,n1);
cout<<endl;
cout<<"Nhap so phan tu mang 2"<<endl;
cin>>n2;
cout<<"Nhap gia tri phan tu mang 2"<<endl;
nhap(b,n2);
cout<<endl;
cout<<"Gia tri 1 mang vua nhap"<<endl;
cout<<"Mang 1"<<endl;
xuat(a,n1); cout<<endl;
cout<<"Mang 2"<<endl;
xuat(b,n2); cout<<endl;
cout<<"--------------------------";
tron(a,b,c,n1,n2);
sapxep(c,n1+n2);
cout<<"Hai mang sau khi tron"<<endl;
xuat(c,n1+n2);
}
