bài tập c++ tổng hợp

Các bài tập lập trình C++
Mùa A Sênh – SP TinA-k44
(Sưu tầm)
//Tong hop cac bai tap ve mang 1 chieu
#include <iostream.h>
#include <math.h>
#define N 50
void nhap(int a[],int n)
{
for (int i=0;i<n;i++)
{
cout<<"a["<<i<<"]=";
cin>>a[i];
}
}
void in_ra(int a[], int n)
{
for (int i=0;i<n;i++) cout<<a[i]<<" ";
endln;
}
void max_min(int a[], int n)
{
int max,min,vt1,vt2;
max=a[0]; vt1=0;
for (int i=1;i<n;i++)
if (max<a[i])
{
max=a[i];
vt1=i;
}
min=a[0]; vt2=0;

for (i=0;i<n;i++)
if (min>a[i])
{
min=a[i];
vt2=i;
}
cout <<"\nPhan tu max = "<<max<<" , nam o vi tri: "<<vt1;
cout<<"\nPhan tu min= "<<min<<" , nam o vi tri: "<<vt2;
}
1
void hoanvi(int &x, int &y)
{
int tg=x;
x=y;
y=tg;
}
void sapxep(int a[], int n)
{
for (int i=0;i<n;i++)
for (int j=i+1;j<n;j++)
if (a[i]>a[j]) hoanvi(a[i],a[j]);
}
int ktra_ngto(int n)
{
int ok=1;
if (n<2) ok=0;
else for (int i=2;i<=sqrt(n);i++)
if (n%i==0)
{
ok=0;

break;
}
return ok;
}
void sodgnn(int a[N],int n)
{
int b[N],j=0,sn;
for (int k=0;k<n;k++)
if (a[k]>0)
{
b[j]=a[k];
j++;
}
for (int i=0; i<j;i++) sapxep(b,j);
cout<<"\nSo duong nho nhat la: "<<b[0];
}
void in_ngto(int a[], int n)
{
for (int i=0;i<n;i++)
if (ktra_ngto(a[i])) cout<<a[i]<<" ";
}
int ktra_hh(int n)
{
int m=0, ok=1;
for (int i=1;i<=(n/2);i++)
2
if (n%i==0) m=m+i;
if (m!=n) ok=0;
else ok=1;
return ok;

}
void dem_hh(int a[],int n)
{
int dem=0;
for (int i=0;i<n;i++)
if (ktra_hh(a[i])) dem++;
cout<<"\nCo "<<dem<<" so hoan hao trong mang";
}
void main()
{
int a[50], n,dem=0;
do //Dieu kien nhap
2<=n<=50;
{
cout <<"\nNhap vao so phan tu cua mang: ";
cin>>n;
}
while (n<2||n>50);
nhap(a,n); //Nhap ma tran a;
cout<<"\n"; //Xuong dong;
max_min(a,n); //Max min cua mang a;
int d1=0,d2=0,d3=0;
for (int i=0;i<n;i++) //Dem so duong,so am,so 0;
if (a[i]>0) d1++;
else if (a[i]==0) d2++;
else d3++;
cout<<"\nMang co "<<d1<<" so duong, co "<<d2<<" so bang 0, co "
<<d3<<" so nho hon 0";
sodgnn(a,n); //In ra so duong nho nhat;
dem_hh(a,n); //Dem cac so hoan hao trong mang;

cout<<"\nCac so nguyen to co trong mang la: ";
in_ngto(a,n); //In cac so nguyen to cua mang;
cout <<"\nMang sau khi sap xep la: ";
sapxep(a,n); //Sap xep lai mang tang dan;
in_ra(a,n); //In ra mang sau khi sap xep;
}
//Mang 2 chieu va file
include <iostream.h>
3
#include <stdio.h>
#include <conio.h>
//
int a[50][50],m,n;
FILE *f;
//
void nhap()
{
int ok=0;
while (!ok)
{
cout<<"Nhap so hang va so cot: ";
cin>>m>>n;
if ((m>=2)&&(m<=50)&&(n>=2)&&(n<=50)) ok=1;
}
for (int i=1;i<=m;i++)
for (int j=1;j<=n;j++)
{
cout<<"Nhap phan tu A["<<i<<","<<j<<"]: ";
cin>>a[i][j];
}

fprintf(f,"Mang vua nhap la: \n");
for (int i=1;i<=m;i++)
{
for (int j=1;j<=n;j++)
fprintf(f,"%d%s",a[i][j]," ");
fprintf(f,"\n");
}
cout<<"Mang vua nhap la: \n";
for (int i=1;i<=m;i++)
{
for (int j=1;j<=n;j++) cout<<a[i][j]<<" ";
cout<<"\n";
}
}
//
void maxmin()
{
int max=a[1][1],min=a[1][1],vtmaxh=1,vtmaxc=1,vtminh=1,vtminc=1;
for (int i=1;i<=m;i++)
for (int j=1;j<=n;j++)
{
if (a[i][j]>max)
{
max=a[i][j];
vtmaxh=i;
4
vtmaxc=j;
}
if (a[i][j]<min)
{

min=a[i][j];
vtminh=i;
vtminc=j;
}
}
cout<<"\nPhan tu lon nhat cua mang la: "<<max<<" o vi tri hang: "<<vtmaxh<<",
cot: "<<vtmaxc;
cout<<"\nPhan tu nho nhat cua mang la: "<<min<<" o vi tri hang: "<<vtminh<<",
cot: "<<vtminc;
fprintf(f,"Max cua mang la: %d,o vi tri hang: %d, cot:
%d\n",max,vtmaxh,vtmaxc);
fprintf(f,"Min cua mang la: %d, o vi tri hang: %d, cot:
%d\n",min,vtminh,vtminc);
}
//
void tong()
{
long tong=0;
for (int i=1;i<=m;i++)
for (int j=1;j<=n;j++)
tong+=a[i][j];
cout<<"\nTong cua mang la: "<<tong;
float tb=tong/(m*n);
printf("\nTrung binh cua mang la: %5.2f",tb);
fprintf(f,"\nTong cua mang la: %d",tong);
fprintf(f,"\nTrung binh cua mang la: %5.2f",tb);
}
//
main()
{

f=fopen("BAI2.TXT","w");
nhap();
maxmin();
tong();
fclose(f);

}
#include <conio.h>
#include <stdio.h>
#include <iostream.h>
#include <math.h>
5
//
int a[51][51],n;
//
void nhap()
{
while (1)
{
cout<<"Nhap so luong phan tu: ";cin>>n;
if ((n>=2)&&(n<=50)) break;
}
for (int i=1;i<=n;i++)
for (int j=1;j<=n;j++)
{
cout<<"Nhap phan tu A["<<i<<","<<j<<"]: ";
cin>>a[i][j];
}
}
//

void inmang()
{
for (int i=1;i<=n;i++)
{
for (int j=1;j<=n;j++)
cout<<a[i][j]<<" ";
cout<<"\n";
}
}
//
void maxmin()
{
int max=a[1][1],min=a[1][1],vtmaxh=1,vtmaxc=1,vtminh=1,vtminc=1;
for (int i=1;i<=n;i++)
for (int j=1;j<=n;j++)
{
if (a[i][j]>max)
{
max=a[i][j];
vtmaxh=i;
vtmaxc=j;
}
if (a[i][j]<min)
{
min=a[i][j];
vtminh=i;
vtminc=j;
}
6
}

cout<<"\nMax la: "<<max<<" o vi tri hang: "<<vtmaxh<<", cot: "<<vtmaxc;
cout<<"\nMin la: "<<min<<" o vi tri hang: "<<vtminh<<", cot: "<<vtminc;
}
//
int ktnt(int x)
{
if (x<2) return 0;
else
for (int i=2;i<=sqrt(x);i++)
if (x%i==0) return 0;
return 1;
}
//
void tongnt()
{
int s=0;
for (int i=1;i<=n;i++)
for (int j=1;j<=n;j++)
if (ktnt(a[i][j])) s+=a[i][j];
cout<<"\nTong cac so nguyen to trong mang la: "<<s;
}
//
void main()
{
nhap();
inmang();
maxmin();
tongnt();
}

//Fibo va file
#include <stdio.h>
#include <conio.h>
#include <iostream.h>
#include <math.h>

int n;
FILE *f;

void nhap()
{
cout<<"Nhap n: ";
7
cin>>n;
fprintf(f,"%d\n",n);
}

int ktnt(int x)
{
if (x<2) return 0;
else
for (int i=2;i<=sqrt(x);i++)
if(x%i==0) return 0;
return 1;
}

void fibo()
{
long i=2,f0=1,f1=1,d=0,f2;
cout<<n<<" so fibonaci dau tien la: \n";

if(n<3)for (int j=1;j<=n;j++)
{
cout<<"1 ";
fprintf(f,"1 ");
}
else
{
cout<<"1 1 ";
fprintf(f,"1 1 ");
while (i<n)
{
f2=f0+f1;
f0=f1;
f1=f2;
i++;
cout<<f2<<" ";
fprintf(f,"%d%s",f2," ");
if (ktnt(f2)) d++;
}
}
cout<<"\nSo luong so nguyen to trong day fibo la: "<<d;
fprintf(f,"\nSo luong so nguyen to trong day fibo la: %d",d);
}

main()
{
f=fopen("FIBO.OUT","w");
nhap();
fibo();
8

fclose(f);

}
//So phuc
#include <conio.h>
#include <stdio.h>
#include <iostream.h>
//
struct sophuc
{
float a,b;
} so1,so2;
//
void nhap()
{
cout<<"Nhap so phuc thu 1: \n";
cout<<"Nhap phan thuc: ";cin>>so1.a;
cout<<"Nhap phan ao: ";cin>>so1.b;
cout<<"Nhap so phuc thu 2: \n";
cout<<"Nhap phan thuc: ";cin>>so2.a;
cout<<"Nhap phan ao: ";cin>>so2.b;
}
//
void cong()
{
sophuc so3;
so3.a=so1.a+so2.a;
so3.b=so1.b+so2.b;
cout<<"("<<so1.a<<" + "<<so1.b<<"i) + ("<<so2.a<<" + "<<so2.b<<"i) = "
<<so3.a<<" + "<<so3.b<<"i\n";

}
//
void tru()
{
sophuc so3;
so3.a=so1.a-so2.a;
so3.b=so1.b-so2.b;
cout<<"("<<so1.a<<" + "<<so1.b<<"i) - ("<<so2.a<<" + "<<so2.b<<"i) = "
<<so3.a<<" + "<<so3.b<<"i\n";
}
//
void nhan()
9
{
sophuc so3;
so3.a=so1.a*so2.a-so1.b*so2.b;
so3.b=so1.a*so2.b+so1.b*so2.a;
cout<<"("<<so1.a<<" + "<<so1.b<<"i) * ("<<so2.a<<" + "<<so2.b<<"i) = "
<<so3.a<<" + "<<so3.b<<"i\n";
}
//
void chia()
{
sophuc so3;
so3.a=(so1.a*so2.a+so1.b*so2.b)/(so2.a*so2.a+so2.b*so2.b);
so3.b=(so1.a*so2.b-so1.b*so2.a)/(so2.a*so2.a+so2.b*so2.b);
cout<<"("<<so1.a<<" + "<<so1.b<<"i) / ("<<so2.a<<" + "<<so2.b<<"i) = "
<<so3.a<<" + "<<so3.b<<"i\n";
}
//

main()
{
nhap();
cong();
tru();
nhan();
chia();

}
#include <iostream.h>
#include <conio.h>
#include <string.h>
#include <stdio.h>
//
struct nhanvien
{
char ht[30],que[20];
int tuoi;
}a[100];
int n;
//
void nhap()
{
char c;
cout<<"Nhap so luong nhan vien: ";cin>>n;
scanf("%c",&c);
for (int i=1;i<=n;i++)
{
10
cout<<"Nhap cho nhan vien thu"<<i<<":\n";

cout<<"Nhap ho ten: ";cin.getline(a[i].ht,30);
cout<<"Nhap que: ";cin.getline(a[i].que,20);
cout<<"Nhap tuoi: ";cin>>a[i].tuoi;
scanf("%c",&c);
}
}
//
void inkq()
{
cout<<"\nDanh sach nhan vien vua nhap la: ";
for (int i=1;i<=n;i++)
{
cout<<"\nNhan vien thu "<<i;
cout<<"\nHo ten: "<<a[i].ht;
cout<<"\nQue: "<<a[i].que;
cout<<"\nTuoi: "<<a[i].tuoi;
}
}
//
void dem()
{
int d=0;
for (int i=1;i<=n;i++)
if(a[i].tuoi>=20) d++;
cout<<"\n\nSo luong nhan vien >=20 tuoi la: "<<d;
}
//
void sapxep()
{
nhanvien tg;

for (int i=1;i<n;i++)
for (int j=i+1;j<=n;j++)
if (strcmpi(a[i].que,a[j].que)>0)
{
tg=a[i];
a[i]=a[j];
a[j]=tg;
}
cout<<"\n\nDanh sach nhan vien sap xep theo que la:";
inkq();
}
//
main()
{
nhap();
11
inkq();
dem();
sapxep();

}



//Quan ly Sinh vien + cau truc tu tro

#include <iostream.h>
#include <conio.h>
#include <stdio.h>
#include <string.h>

//
struct SINHVIEN
{
char ht[30],lop[10];
float toan,tin,anh;
SINHVIEN *tiep;
}*pdau,*p;
int n=0;
//
void nhap()
{
char hoten[30],l[10];
float dtoan,dtin,danh;
pdau=NULL;
while (1)
{
cout<<"Nhap ho ten: ";cin.getline(hoten,30);
cout<<"Lop: ";cin.getline(l,10);
cout<<"Diem toan, tin, anh: ";
cin>>dtoan>>dtin>>danh;
char tl;
cin.ignore();
if (pdau==NULL)
{
pdau=new (SINHVIEN);
p=pdau;
}
else
{
p->tiep=new (SINHVIEN);

p=p->tiep;
}
12
strcpy(p->ht,hoten);
strcpy(p->lop,l);
p->toan=dtoan;
p->tin=dtin;
p->anh=danh;
n++;
cout<<"Ban co muon nhap nua ko?(C/K): ";cin>>tl;
if (tl=='K'||tl=='k') break;
cin.ignore();
}
}
//
void inkq()
{
p=pdau;
for (int i=1;i<=n;i++)
{
cout<<"Ho ten: "<<p->ht<<", lop: "<<p->lop<<"\n";
cout<<"Diem toan: "<<p->toan<<", diem tin: "<<p->tin<<", diem anh: "<<p-
>anh<<"\n\n";
p=p->tiep;
}
}
//
int dem()
{
p=pdau;

int d=0;
for (int i=1;i<=n;i++)
{
if (((p->toan)+(p->tin)+(p->anh))/3.0>=7) d++;
p=p->tiep;
}
return d;
}
//
void main()
{
nhap();
cout<<"\nDanh sach sinh vien vua nhap la: \n\n";
inkq();
cout<<"So luong sinh vien co dtb >=7 la: "<<dem()<<"\n";
}
13
#include <conio.h>
#include <stdio.h>
#include <string.h>
//
struct hoso
{
char ht[30],lop[10];
int toan, tin,anh;
}a[100];
int n;
//
void nhap()
{

int i=1;
while (1)
{
printf("Nhap ho ten: ");gets(a[i].ht);
printf("Nhap lop: ");gets(a[i].lop);
printf("Nhap diem toan, tin, anh: ");scanf("%d%d
%d",&a[i].toan,&a[i].tin,&a[i].anh);
i++;
char tl,c;
scanf("%c",&c);
printf("Ban co muon tiep tuc ko?(C/K): ");scanf("%c",&tl);
scanf("%c",&c);
if (tl=='k'||tl=='K') break;
}
n=i-1;
}
//
void inkq()
{
for (int i=1;i<=n;i++)
{
printf("\n");
printf("Ho va ten: %s \n",a[i].ht);
printf("Lop: %s\n",a[i].lop);
printf("Diem toan: %d, Diem tin: %d, Diem anh: %d \n",a[i].toan,a[i].tin,a[i].anh);
}
}
//
int dem()
{

int d=0;
for (int i=1;i<=n;i++)
if((a[i].toan+a[i].tin+a[i].anh)/3.0>=7) d++;
14
return d;
}
//
void main()
{
nhap();
inkq();
printf("So luong sinh vien duoc thi top nghiep la: %d",dem());
}
//File
void inrafile()
{
FILE *f;
f=fopen("SO.OUT","w");
for (int i=1;i<=n;i++)
fprintf(f,"%d%s",a[i]," ");
fprintf(f,"%s","\n");
fprintf(f,"%s%d","\nso cac so nguyen to co trong mang la: ")
}
//Quan ly nhan su
#include <iostream.h>
#include <conio.h>
#include <stdio.h>
//
struct NHANSU
{

char ho[20],ten[20];
int ngay, thang, nam;
}a[100];
int n;
//
void nhap()
{
int i=1;
while (1)
{
cout<<"Nhap ho: ";cin.getline(a[i].ho,20);
cout<<"Nhap ten: ";cin.getline(a[i].ten,20);
cout<<"Nhap ngay sinh: ";cin>>a[i].ngay;
cout<<"Nhap thang sinh: ";cin>>a[i].thang;
15
cout<<"Nhap nam sinh: ";cin>>a[i].nam;
char c,tl;
scanf("%c",&c);
i++;
cout<<"Ban co muon nhap tiep ko?(C/K): ";cin>>tl;
if (tl=='k'||tl=='K') break;
scanf("%c",&c);
}
n=i-1;
}
//
void inkq()
{
for (int i=1;i<=n;i++)
{

cout<<"\nHo va ten: "<<a[i].ho<<" "<<a[i].ten;
cout<<"\nSinh ngay: "<<a[i].ngay<<"/"<<a[i].thang<<"/"<<a[i].nam;
}
cout<<"\n";
}
//
int dem()
{
int d=0;
for (int i=1;i<=n;i++)
if((a[i].nam>=1990)&&(a[i].nam<=2000))d++;
return d;
}
//
void main()
{
nhap();
cout<<"\nMang vua nhap la: ";
inkq();
cout<<"Co "<<dem()<<" nguoi sinh tu nam 1990 -> 2000.";
}

//QL Nhan su
#include <iostream.h>
#include <conio.h>
#include <stdio.h>
#include <string.h>
//
struct NHANSU
16

{
char hoten[30];
int tuoi,hsl;
};
int n;
//
void nhap()
{
NHANSU a;
FILE *f;
f=fopen("NHANSU.DAT","w");
while (1)
{
cout<<"Nhap ho ten: ";cin.getline(a.hoten,30);
cout<<"Nhap tuoi: ";cin>>a.tuoi;
cout<<"Nhap he so luong: ";cin>>a.hsl;
cin.ignore();
char tl;
cout<<"Ban co muon tiep tuc ko?(C/K): ";cin>>tl;
cin.ignore();
fwrite(&a,sizeof(NHANSU),1,f);
if (tl=='k'||tl=='K') break;
}
fclose(f);
}
//
void inkq()
{
FILE *f;
f=fopen("NHANSU.DAT","r");

NHANSU a;
while (fread(&a,sizeof (NHANSU),1,f)>0)
cout<<"\nHo ten: "<<a.hoten<<", tuoi: "<<a.tuoi<<", he so luong: "<<a.hsl;
fclose(f);
}
//
int dem()
{
FILE *f;
f=fopen("NHANSU.DAT","r");
NHANSU a;
int d=0;
while (fread(&a,sizeof(NHANSU),1,f)>0)
if ((a.hsl)*500>2500000) d++;
return d;
}
17
//
void main()
{
nhap();
inkq();
cout<<"\nSo luong nguoi co luong >=2tr5 la: "<<dem();
}

#include <iostream.h>
#include <conio.h>
#include <stdio.h>
//
struct NHANSU

{
char ht[30],gt[5],que[20];
int tuoi;
};
int n=0;
//
void nhap()
{

NHANSU a;
FILE *f;
f=fopen("NHANSU.TXT","wb");
while (1)
{
cout<<"Nhap ho va ten: ";cin.getline(a.ht,30);
cout<<"Nhap gioi tinh: ";cin.getline(a.gt,5);
cout<<"Nhap que: ";cin.getline(a.que,20);
cout<<"Nhap tuoi: ";cin>>a.tuoi;
cin.ignore();
fwrite(&a,sizeof(NHANSU),1,f);
n++;
char tl;
cout<<"Ban co muon tiep tuc ko?(C/K): ";cin>>tl;
cin.ignore();
if (tl=='k'||tl=='K') break;
}
fclose(f);
}
//
void inkq()

{
FILE *f;
18
NHANSU a;
f=fopen("NHANSU.TXT","rb");
while (fread(&a,sizeof(NHANSU),1,f)>0)
{
cout<<"\nHo ten: "<<a.ht;
cout<<"\nGioi tinh: "<<a.gt;
cout<<"\nQue: "<<a.que;
cout<<"\nTuoi: "<<a.tuoi;
}
cout<<"\n";
fclose(f);
}
//
void chen()
{
NHANSU a,tg;
FILE *f,*ftg;
f=fopen("NHANSU.TXT","rb");
int m;
cout<<"Chen vao sau ban ghi thu: ";cin>>m;
cin.ignore();
m ;
if (m>=0&&m<=n)
{
ftg=fopen("FILETG.TXT","wb");
int tt=0;
while(fread(&a,sizeof(NHANSU),1,f)>0)

{
fwrite(&a,sizeof(NHANSU),1,ftg);
if(tt==m)
while (1)
{
cout<<"Nhap du lieu can chen: \n";
cout<<"Nhap ho ten: ";cin.getline(tg.ht,30);
cout<<"Nhap gioi tinh: ";cin.getline(tg.gt,5);
cout<<"Nhap que: ";cin.getline(tg.que,20);
cout<<"Nhap tuoi: ";cin>>tg.tuoi;
cin.ignore();
fwrite(&tg,sizeof(NHANSU),1,ftg);
n++;
char tl;
cout<<"Ban co muon nhap tiep ko?(C/K): ";cin>>tl;
cin.ignore();
if (tl=='k'||tl=='K') break;
}
tt++;
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}
fclose(f);
fclose(ftg);
remove("NHANSU.TXT");
rename("FILETG.TXT","NHANSU.TXT");
}
}
//
void xoa()
{

NHANSU a;
FILE *f,*ftg;
f=fopen("NHANSU.TXT","rb");
int m;
cout<<"Nhap vi tri can xoa: ";cin>>m;
cin.ignore();
if (m>=0&&m<=n)
{
ftg=fopen("FILETG.TXT","wb");
int tt=0;
while (fread(&a,sizeof(NHANSU),1,f)>0)
{
if (tt!=m)
{
fwrite(&a,sizeof(NHANSU),1,ftg);
tt++;
}
tt++;
}
}
fclose(f);
fclose(ftg);
remove("NHANSU.TXT");
rename("FILETG.TXT","NHANSU.TXT");
}
//
void main()
{
nhap();
inkq();

chen();
cout<<"\nDanh sach sau khi duoc chen them vao la: \n";
inkq();
xoa();
cout<<"\nDanh sach sau khi duoc xoa la: \n";
inkq();
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}

#include <iostream.h>
#include <string.h>
#include <conio.h>
char s[50];
int n,dem=0;
void nhap()
{
cout<<"Nhap xau: ";
cin.getline(s,50);
n=strlen(s);
}
void batdau(char *s)
{
char x[50]=" ";
int d=0;
strcat(x,s);
for (int i=0;i<strlen(x);i++)
if (((x[i]==' ')&&(x[i+1]=='n'))||((x[i]==' ')&&(x[i+1]=='N'))) d++;
cout<<"\nSo tu bat dau bang chu N or n la: "<<d;
}
void ketthuc(char *s)

{
strcat(s," ");
int d=0;
for (int i=0;i<strlen(s);i++)
if (((s[i]=='g')&&(s[i+1]==' '))||((s[i]=='G')&&(s[i+1]==' '))) d++;
cout<<"\nSo luong tu ket thuc bang chu G or g la: "<<d;
}
int ktra(char *x, int k)
{
int ok=1;
for (int i=0;i<=k/2;i++)
if (x[i]!=x[k-i-1])
{
ok=0;
break;
}
return ok;
}
void tachtu()
{
char x[30];
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int i=0,k=0;
while (i<n)
{
while ((s[i]!=' ')&&(i<n))
{
x[k]=s[i];
k++;
i++;

}
if (ktra(x,k)) dem++;
k=0;
i++;
}
}
void inkq()
{
cout<<"\nSo tu doi xung trong xau la: "<<dem;
}
void main()
{
nhap();
batdau(s);
ketthuc(s);
tachtu();
inkq();
}
//Dem tu
#include<iostream.h>
#include<string.h>
#include <stdio.h>
int dem_tu(char *s)
{
int n=strlen(s),d=0;
for (int i=0;i<n;i++)
if (s[i]!=' '&&s[i+1]==' ') d++;
return d;
}
void main()

{
char ch[80];
FILE *f;
/*f=fopen("chuoi.TXT","w");
22
while (strlen(gets(ch))>0)
{
fputs(ch,f);
fputs("\n",f);
}
fclose(f);*/

cout<<"\nNoi dung tep la: ";
f=fopen("chuoi.TXT","r");
while (fgets(ch,80,f) !=NULL)
{
cout <<ch;
cout<<"\nSo tu co trong tep vb la: ";
dem_tu(ch);
}
fclose(f);
}
//Fibo
# include<iostream.h>
# include<math.h>
# include<stdio.h>
long fibo(int n)
{
if (n<3) return 1;
else

return (fibo(n-2)+fibo(n-1));
}
int nto(int n)
{
int ok=1;
if (n<2) ok=0;
else
for(int i=2;i<=sqrt(n);i++)
if (n%i==0)
{
ok=0;
break;
};
return ok;
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}
int dem(int n)
{
int d=0;
for (int i=0;i<n;i++)
if (nto(fibo(i))) d=d+1;
return d;
}
void main()
{
FILE *f; int n,d=0;
cout<<"\n nhap n: "; cin>>n;
f= fopen("fbb.txt","w");
fprintf(f,"%d%s",n,"\n");
for (int i=0;i<n;i++)

fprintf(f,"%d%s",fibo(i)," ");
d=dem(n);
fprintf(f,"\nso luong so nguyen to trong day fibo la: %d",d);
}
//Ma tran file
#include <iostream.h>
#include <stdio.h>
#define N 50
char ten[]="matran.TXT";
void ghi(int a[][N],int n, int m)
{
FILE *f;
f=fopen(ten,"wb");
for (int i=0;i<n;i++)
for (int j=0;j<m;j++)
{
cout<<"a["<<i<<"]["<<j<<"]=";
cin>>a[i][j];
fwrite(&a,sizeof(int),n*m,f);
}
fclose(f);
}
24
void doc(int a[][N],int n,int m)
{
FILE *f;
if ((f=fopen(ten,"rb"))==NULL)
cout <<"\nLoi mo tep";
else
{

fread (&a,sizeof(int),n*m,f);
for(int i=0;i<n;i++)
{
cout<<"\n";
for (int j=0;j<m;j++)

cout<<a[i][j]<<" ";

}
}
fclose(f);
}
void main()
{
int a[N][N],n,m;
cout<<"\nNhap vao kich thuoc ma tran: ";
cin>>n>>m;
ghi(a,n,m);cout<<endl;
doc(a,n,m);
}
//Ham kt nguyen to
#include <iostream.h>
#include <math.h>
//Ham kiem tra so nguyen to
int KIEMTRA_NT(int n)
{
int ok=1;
if (n<2) ok=0;
else
{

for (int i=2;i<=sqrt(n);i++)
if (n%i==0)
{
ok=0;
break;
25