Tuyển chọn các dạng bài tập C++ hay

#include <stdio.h>

void main()
{
float a, b;

printf("\nGiai phuong trinh bac nhat AX + B = 0");
printf("\nCho biet ba he so A B : ");
scanf("%f%f", &a, &b);

if (a==0)
if (b!=0)
printf("Phuong trinh vo nghiem");
else
printf("Phuong trinh co nghiem khong xac dinh");
else
printf("Dap so cua phuong trinh tren = %f", -b/a);
getch();
}

#include <stdio.h>
#include <math.h>

void main()
{
double a, xn, ketqua;

printf("\nNhap vao so muon tinh can bac hai : ");
scanf("%lf", &a);
xn = (a+1)/2;
do {
ketqua = xn;
xn = 0.5 * (xn + a/xn);
} while (fabs(xn-ketqua) > 0.0001);
printf("\nKet qua = %lf", xn);
getch();
}

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

void main() {
clrscr();
short d[]={1,2};
printf("Nhap chieu cao tam giac: ");
int i,num,space;
scanf("%d",&i);
num=2*i+1;
for(int n=0;n<i;++n) {
 space=(num-(2*n+1))/2;
 while(space-->0)
 printf(" ");
 int index;
 for(int j=0;j<2*n+1;++j) {
 index=(j%2)?1:0;
 printf("%d",d[index]);
 }
 printf("\n");
}
getch();
}

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
	long int thang, nam;
 cout<<"Nhap thang va nam: ";
 cin>>thang>>nam;
 if ((thang>12||thang<1)||(nam<0))
 cout<<"Nhap thang hoac nam sai";
 else
 {
 bool namnhuan=((nam%4==0&&nam%100!=0)||(nam%400==0&&nam%100==0));
 int songay;
 if(thang==4||thang==6||thang==9||thang==11)
 songay = 30;
 else
 {
 if(thang==2)
 songay = namnhuan?29:28;
 else
 songay=31;
 }
 cout<<"So ngay cua thang "<<thang<<" trong nam "<<nam<<" la: "<<songay<<endl;
 }
	getch();
}

#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
int main ()
{
 clrscr ();
 char* p;
 int i,n;
 p = (char*)malloc(128);
 printf("\n Nhap xau ki tu :");
 gets (p);
 n = strlen(p);
 printf("\n xau dao: \n");
 for( i = n-1; i>=0; i --)
 putchar(p[i]);
 printf("\n");
 free(p);
 getch ();
 return 0;
}

#include <stdio.h>
#include <conio.h>
#include <string.h>
void main()
{
 char s[50];
 int i, len;

 printf("\nNhap vao mot chuoi : ");
 gets(s);
 len = strlen(s);
 i = 0;
 while (i<len)
 {
 while (s[i] == ' ' && i<len)
 i++;
 while (s[i] != ' ' && i<len)
 putc(s[i++], stdout);
 putc('\n', stdout);
 }
 getch();
}

#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>

int main()
{
int fp;

long file_size;

if ((fp = open("f:/cprojects/urls.txt", O_RDONLY)) == -1)
printf("Error opening the file \n");
else
{
file_size = filelength(file_handle);
printf("The file size in bytes is %ld\n", file_size);
close(fp);
}
return 0;
}

#include <stdio.h>

void main(void)
{
FILE *fp;
char ch;

fp = fopen("websites.txt","r");
ch = getc(fp);
while(ch!=EOF)
{
putchar(ch);
ch = getc(fp);
}
printf("\n\n");
}

#include <stdio.h>
#include <dos.h>

void main(void)
{
struct fatinfo fat;

getfatd(&fat);

printf("Sectors per cluster %d\n", fat.fi_sclus);
printf("Clusters per disk %u\n", fat.fi_nclus);
printf("Bytes per cluster %d\n", fat.fi_bysec);
printf("Disk type %x\n", fat.fi_fatid & 0xFF);
}

/* Giai bai toan co : 
 Tram trau tram co 
 Trau dung an nam 
 Trau nam an ba 
 Trau gia an mot 
*/ 

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

void main() 
{ 
 int tdung, tnam, tgia, phuongan=0; 

 for (tdung = 1; tdung <= 98; tdung ++) 
 for (tnam = 1; tnam < 99 - tdung; tnam ++) 
 for (tgia = 1; tgia < 99 - (tdung + tnam); tgia++) 
 if ((tdung*5 + tnam*3 + tgia) == 100) 
 { 
 printf("\nTrau dung : %5d ; Trau nam : %5d ; Trau gia : %5d", 
 tdung, tnam, tgia); 
 phuongan++; 
 } 
 printf("\nTong cong co %d phuong an.", phuongan); 
 getch(); 
}

#include <stdio.h>
#include<conio.h>
int dong[8], cot[8], cheoxuoi[15], cheonguoc[15];

void print ()
{
 int i;
 printf("\n");
 for (i=0; i<8; i++)
 printf("%3d", dong[i]);
}

void thu(int i)
{
 int j;
 for (j=0; j<8; j++)
 {
 if (cot[j] == 1 && cheoxuoi[i+j] ==1 && cheonguoc[i-j+7] == 1)
 {
 dong[i] = j;
 cot[j] = 0;
 cheoxuoi[i+j] = 0;
 cheonguoc[i-j+7] = 0;
 if (i<7)
 thu(i+1);
 else
 print();
 cot[j] = 1;
 cheoxuoi[i+j] = 1;
 cheonguoc[i-j+7] = 1;
 }
 }
}

void tim()
{
 int i, q;

 for (i=0; i<8; i++)
 {
 cot[i] = 1;
 dong[i] = -1;
 }
 for (i=0; i<15; i++)
 {
 cheoxuoi[i] = 1;
 cheonguoc[i] = 1;
 }
 thu(0);
}

void main()
{
 tim();
 getch();
}

#include<iostream.h>
#include<conio.h>
#include<math.h>
bool LaNguyenTo(int n);
void main()
{
	int n;
 cout<<"Nhap vao mot so bat ky: ";cin>>n;
 	if(LaNguyenTo(n))
 		cout<<"La so nguyen to";
 	else
 		{
 	cout<<"Khong la so nguyen to vi no chia het cho ";
 for(int j=2;j<n;j++)
 {
 	if(n%j==0)
 cout<<j<<" va ";
 }
 cout<<"The thoi";
 }
 getch();
}
bool LaNguyenTo(int n)
{
		bool co=true;
 if(n<2)
 {cout<<"Du lieu nhap sai va so do ";
 	return !co;}
 	else
 {
 		for(int i=2;i<=sqrt(n)+1;i++)
 		{
 			if(n%i==0)
 		{
 				co=false;
 			break;
 		}
 		}
 	}
 return co;
}

#include <stdio.h>
#include <conio.h>
#define MAX 10
int mang[MAX], n;

void swap (int *x, int *y)
{
 int tmp;
 tmp = *x;
 *x = *y;
 *y = tmp;
}

void hoanvi(int k)
{
 int j;

 if (k==1)
 {
 printf("\n");
 for (j=0; j<n; j++)
 printf("%d ", mang[j]);
 }
 else
 for (j=k-1; j>=0; j--)
 {
 swap(&mang[k-1], &mang[j]);
 hoanvi(k-1);
 swap(&mang[j], &mang[k-1]);
 }
}

void main()
{
 int i;

 printf("\nCho biet so phan tu (N < 10) : ");
 scanf("%d", &n);
 for (i=0; i<n; i++)
 mang[i] = i;
 hoanvi(n);
 getch();
}

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

unsigned long giaithua(int n)
{
 unsigned long ketqua = 1;
 int i;

 for (i=2; i<=n; i++)
 ketqua *= i;

 return ketqua;
}

unsigned long to_hop_chap(int k, int n)
{
 return giaithua(n) / (giaithua(k) * giaithua(n-k));
}

void main()
{
 int n, k;

 printf("\nNhap vao gia tri N va K : ");
 scanf("%d%d", &n, &k);

 printf("Top hop chap %d cua %d = %lu", k, n, to_hop_chap(k, n));
 getch();
}

#include<iostream.h>
#include<conio.h>
#include<math.h>
float max(int a, int b);
float min(int a, int b);
void main()
{
 	int a,b,c,d;
 cout<<"Nhap vao so thu 1: ";cin>>a;
 cout<<"Nhap vao so thu 2: ";cin>>b;
 cout<<"Nhap vao so thu 3: ";cin>>c;
 cout<<"Nhap vao so thu 4: ";cin>>d;
 cout<<"max= "<<max(max(max(a,b),max(b,c)),max(c,d))<<" min= "<<min(min(min(a,b),min(b,c)),min(c,d))<<endl;
 cout<<"Vay trung binh cong cua 4 so do la: "<<(a+b+c+d)/4;
 getch();
}
float max(int a, int b)
{
 	if(a>b)
 	return a;
 	else
 	return b;
}
float min(int a, int b)
{
 	if(a>b)
 	return b;
 	else
 	return a;
}

#include<iostream.h>
#include<conio.h>
void main()
{
 int a;
 cout<<"Nhap vao mot so co 3 hay 2 tham chi 1 chu so: ";
 cin>>a;
 int hangtram=a/100;
 int hangchuc=((a/10)%10);
 int hangdonvi=a%10;
 switch(hangtram)
 {
 	 case 1 :cout<<"Mot tram ";break;
 case 2 :cout<<"Hai tram ";break;
 case 3 :cout<<"Ba tram ";break;
 case 4 :cout<<"Bon tram ";break;
 case 5 :cout<<"Nam tram ";break;
 case 6 :cout<<"Sau tram ";break;
 case 7 :cout<<"Bay tram ";break;
 case 8 :cout<<"Tam tram ";break;
 case 9 :cout<<"Chin tram ";break;
 }
 switch(hangchuc)
 {
 case 0:
 if(hangdonvi==0)
 cout<<"";
 else
 {if(hangchuc==0&&hangtram==0)
 cout<<"";
 else
 cout<<"ninh";}
 break;
 	 case 1:cout<<"muoi";break;
 case 2:cout<<"hai muoi";break;
 case 3:cout<<"ba muoi";break;
 case 4:cout<<"bon muoi";break;
 case 5:cout<<"nam muoi";break;
 case 6:cout<<"sau muoi";break;
 case 7:cout<<"bay muoi";break;
 case 8:cout<<"tam muoi";break;
 case 9:cout<<"chin muoi";break;
 }
 switch(hangdonvi)
 {
 	 case 0:cout<<"Khong";break;
 		case 1:
 if(hangchuc==1||(hangtram==0&&hangchuc==0))
 cout<<" mot";
 else
 cout<<" mo't";
 break;
 case 2:cout<<" hai";break;
 case 3:cout<<" ba";break;
 case 4:
 		if(hangchuc==1)
 cout<<" bon";
 else
 {if(hangchuc==0&&hangtram==0)
 cout<<"bon";
 else
 cout<<" tu";}
 break;
 case 5:
 if(hangchuc==0&&hangtram==0)
 cout<<" nam";
 else
 cout<<" lam";
 break;
 case 6:cout<<" sau";break;
 case 7:cout<<" bay";break;
 case 8:cout<<" tam";break;
 case 9:cout<<" chin";break;
 }
	getch();
}

#include <conio.h>
#include <stdlib.h>

void main()
{
 int mang[20];

 int i, minval, maxval;

 /* Khoi tao mang ngau nhien */
 randomize();
 for (i=0; i<20; i++)
 mang[i] = random(100);

 /* Tim gia tri lon nhat va nho nhat */
 minval = maxval = mang[0];
 for (i=1; i<20; i++)
 {
 if (maxval < mang[i])
 maxval = mang[i];
 else if (minval > mang[i])
 minval = mang[i];
 }

 /* In mang */
 clrscr();
 for (i=0; i<20; i++)
 {
 if (mang[i] == maxval)
 textcolor(YELLOW);
 else if (mang[i] == minval)
 textcolor(RED);
 else
 textcolor(WHITE);
 cprintf("%3d", mang[i]);
 }

 getch();
}

#include <stdio.h> 
#include <conio.h> 
#define MAX 10 

void main() 
{ 
 int a[MAX], b[MAX], c[2*MAX], n1, n2, i, i1, i2; 

 printf("\nCho biet so phan tu cua mang thu nhat : "); 
 scanf("%d", &n1); 
 printf("Nhap vao cac phan tu (giam dan) cua mang thu nhat : "); 
 for (i=0; i<n1; i++) 
 scanf("%d", &a[i]); 
 printf("\nCho biet so phan tu cua mang thu hai : "); 
 scanf("%d", &n2); 
 printf("Nhap vao cac phan tu (giam dan) cua mang thu hai : "); 
 for (i=0; i<n2; i++) 
 scanf("%d", &b[i]); 
 i1 = n1-1; 
 i2 = n2-1; 
 for (i=0; i<n1 + n2; i++) 
 { 
 if (i1 < 0 || i2 < 0) 
 break; 
 if (a[i1] < b[i2]) 
 { 
 c[i] = a[i1]; 
 i1--; 
 } 
 else 
 { 
 c[i] = b[i2]; 
 i2--; 
 } 
 } 
 if (i1 >= 0) 
 while (i1 >= 0) 
 c[i++] = a[i1--]; 
 if (i2 >= 0) 
 while (i2 >= 0) 
 c[i++] = b[i2--]; 
 printf("\nCac phan tu cua mang tron : "); 
 for (i=0; i<n1+n2; i++) 
 printf("%d ", c[i]); 
 getch(); 
}

#include <stdio.h>

void main()
{
int a[10], i, maxstart, maxend, maxlen, tmpstart, tmpend, tmplen;

printf("\nNhap vao 10 phan tu nguyen cua day :");
for (i=0; i<10; i++)
scanf("%d", &a[i]);
printf("Day da cho :\n");
for (i=0; i<10; i++)
printf("%6d", a[i]);

maxstart = maxend = tmpstart = tmpend = 0;
maxlen = tmplen = 1;
for (i=1; i< 10; i++)
{
if (a[i] < a[tmpend])
{
if (maxlen < tmplen)
{
maxstart = tmpstart;
maxend = tmpend;
maxlen = tmplen;
}
tmpstart = tmpend = i;
tmplen = 1;
}
else
{
tmplen++;
tmpend++;
}
}
if (maxlen < tmplen)
{
maxstart = tmpstart;
maxend = tmpend;
}
printf("\nDay tang co so phan tu nhieu nhat la : \n");
for (i=maxstart; i<=maxend; i++)
printf("%6d", a[i]);
getch();
}

#include <stdio.h>

void main()
{
int a[10], i, maxstart, maxend, maxtotal, tmpstart, tmpend, tmptotal;

printf("\nNhap vao 10 phan tu nguyen cua day :");
for (i=0; i<10; i++)
scanf("%d", &a[i]);
printf("Day da cho :\n");
for (i=0; i<10; i++)
printf("%6d", a[i]);

maxstart = maxend = tmpstart = tmpend = 0;
maxtotal = tmptotal = a[0];
for (i=1; i< 10; i++)
{
if (a[i] < a[tmpend])
{
if (maxtotal < tmptotal)
{
maxstart = tmpstart;
maxend = tmpend;
maxtotal = tmptotal;
}
tmpstart = tmpend = i;
tmptotal = a[i];
}
else
{
tmptotal += a[i];
tmpend++;
}
}
if (maxtotal < tmptotal)
{
maxstart = tmpstart;
maxend = tmpend;
}
printf("\nDay tang co tong nhieu nhat la : \n");
for (i=maxstart; i<=maxend; i++)
printf("%6d", a[i]);
getch();
}

#include <stdio.h> 
#include <conio.h> 
unsigned USCLN (unsigned n, unsigned m) 
{ 
 while (n != 0 && m != 0) 
 if (n>m) 
 n -= m; 
 else 
 m -= n; 
 if (n == 0) 
 return m; 
 else 
 return n; 
} 

unsigned BSCNN (unsigned n, unsigned m) 
{ 
 return n * m / USCLN(n, m); 
} 

void main() 
{ 
 unsigned n, m; 

 printf("\nNhap hai vao so nguyen duong : "); 
 scanf("%u%u", &n, &m); 
 printf("\nUSCLN cua %u va %u = %u", n, m, USCLN(n,m)); 
 printf("\nBSCNN cua %u va %u = %u", n, m, BSCNN(n,m)); 
 getch(); 
}

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

// func declaration
void matrix( int n );

// main()
int main(void)
{
 int n;
 
 // input until it's valid.
 do 
 {
 printf("\n Plz input size of matrix [ odd size & n < 20 ]: n = ");
 scanf("%d",&n);
 if ( n % 2 == 0 ) printf("\n Invalid input value .. Plz re-input ... \n");
 } 
 while ( n % 2 == 0 );
 
 if ( n > 20 ) { n = 19 ; // in case of n is greater than 20
 printf("\n %d is greater than 20 & set to be default as 19 .",n ); } // end if
 
 // call matrix()
 matrix(n);
 // stop to watch
 getch();
 return 0;
}

// function matrix(int n)
void matrix( int n )
{
 int a[20][20];
 int i, j, row, col, count = 1;
 int old_row, old_col, sum = 0;
 
 // set starting value of array
 for ( i = 0 ; i < n ; i++ )
 for ( j = 0 ; j < n ; j++ )
 a[i][j] = 0;
 
 // set the 1st value to start
 row = 0; col = (n-1) / 2;
 
 while ( count < n*n + 1 )
 {
 a[row][col] = count++ ; // set value for elements
 old_row = row ; old_col = col; // save the last addresses
 // define whether going out of array
 row -= 1; if ( row == -1 ) row = n - 1; 
 col += 1; if ( col == n ) col = 0;
 // in case of already having number
 if ( a[row][col] != 0 ) 
 {
 row = old_row + 1;
 col = old_col;
 } // end if
 } // end while
 // print result
 printf("\n");
 for ( i = 0 ; i < n ; i++ )
 {
 for ( j = 0 ; j < n ; j++ )
 printf("%4d",a[i][j]);
 printf("\n");
 } // end for
 
 // calculate sum
 for ( j = 0 ; j < n ; j++ )
 sum += a[0][j];
 printf("\n Sum of each row - column - diagonal line is : %d " , sum);
 
 return;
}

#include <iostream.h> 
#include <conio.h> 
#include <stdlib.h> 
void congmt(float a[][10],float b[][10],float c[][10],int hang,int cot); 
void nhapmt(float a[][10],int hang,int cot); 
void inmt(float a[][10],int hang,int cot); 
void main() 
{ 
 system("color 3e"); 
 float a[10][10],b[10][10],c[10][10]; 
 int hang1,cot1; 

 cout<<"Moi ban nhap vao ma tran a: \n"; 
 cout<<"Nhap vao so hang cua ma tran a: "; 
 cin>>hang1; 
 cout<<"Nhap vao so cot cua ma tran a: "; 
 cin>>cot1; 
 nhapmt(a,hang1,cot1); 
 inmt(a,hang1,cot1); 

 int hang2,cot2; 
 cout<<"Moi ban nhap vao ma tran b: \n"; 
 do 
 { 
 cout<<"Nhap vao so hang cua ma tran b: "; 
 cin>>hang2; 
 }while(hang2 != hang1); 
 do 
 { 
 cout<<"Nhap vao so cot cua ma tran b: "; 
 cin>>cot2; 
 }while(cot2 != cot1); 
 nhapmt(b,hang2,cot2); 
 inmt(b,hang2,cot2); 

 cout<<"\nVay tong cua hai ma tran a,b la: \n"; 
 congmt(a,b,c,hang1,cot1); 
 inmt(c,hang1,cot1); 
 getch(); 
} 

void congmt(float a[][10],float b[][10],float c[][10],int hang,int cot) 
{ 
 for (int i=0; i<hang; i++) 
 for (int j=0; j<cot; j++) 
 c[i][j] = a[i][j] + b[i][j]; 
} 

void nhapmt(float a[][10],int hang,int cot) 
{ 
 for(int i = 0;i < hang;i++) 
 { 
 for(int j = 0; j < cot; j++) 
 { 
 cout<<"Nhap vao phan tu ["<<i<<";"<<j<<"]: "; 
 cin>>a[i][j]; 
 } 
 } 
} 

void inmt(float a[][10],int hang,int cot) 
{ 
 for(int i = 0; i < hang; i++) 
 { 
 for(int j = 0; j < cot; j++) 
 { 
 cout<<a[i][j]<<"\t"; 
 } 
 cout<<endl; 
 } 
}

#include<conio.h> 
#include<stdio.h> 
#include<alloc.h> 
void main() 
{ 
int *a,*b,*c; 
int m,n; 
int i,j; 
clrscr(); 
//Nhap so hang so cot 
printf("Nhap vao m:");scanf("%d",&m); 
printf("Nhap vao n:");scanf("%d",&n); 
//Cap phat bo nho 
a=(int*)calloc(m*n,sizeof(int)); 
b=(int*)calloc(m*n,sizeof(int)); 
c=(int*)calloc(m*n,sizeof(int)); 
// Nhap so lieu va tinh toan 
for(i=1;i<=m;i++) 
for(j=1;j<=n;j++) 
{ 
 printf("Nhap vao a[%d,%d]=",i,j);scanf("%d",&a[(i-1+j)+((i-1)*(n-1))]); 
} 
for(i=1;i<=m;i++) 
for(j=1;j<=n;j++) 
{ 
 printf("Nhap vao b[%d,%d]=",i,j);scanf("%d",&b[(i-1+j)+((i-1)*(n-1))]); 
 c[(i-1+j)+((i-1)*(n-1))]=a[(i-1+j)+((i-1)*(n-1))]+b[(i-1+j)+((i-1)*(n-1))]; 
} 
// xuat cac mang a,b,c ra man hinh 
for(i=1;i<=m;i++) 
for(j=1;j<=n;j++) 
{ 
 printf("\t%d",a[(i-1+j)+((i-1)*(n-1))]); 
 if(j==n)printf("\n"); 
} 
printf("\n===========\n"); 
for(i=1;i<=m;i++) 
for(j=1;j<=n;j++) 
{ 
 printf("\t%d",b[(i-1+j)+((i-1)*(n-1))]); 
 if(j==n)printf("\n"); 
} 
printf("\n===========\n"); 
for(i=1;i<=m;i++) 
for(j=1;j<=n;j++) 
{ 
 printf("\t%d",c[(i-1+j)+((i-1)*(n-1))]); 
 if(j==n)printf("\n"); 
} 
getch(); 
}

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

#define N 2
#define M 5

void search(int b[N][N],int a[M][M])
{
 int i,j,k,l,m,x,y,dem,demx,demy;
 int timthay=1;

 for(k=0;k<=M-N;++k)
 {
 for(l=0;l<=M-N;++l)
 {
 dem=demx=demy=0;
 x=l;y=k;
 for(i=0;i<N;++i)
 {
 for(j=0;j<N;++j)
 {
 if(b[i][j]==a[y][x])dem++;
 ++x;++demx;
 if(demx==N){demx=0;x=l;}
 }
 ++y;++demy;
 if(demy==N){demy=0;y=k;}
 }
 if(dem==N*N)break;
 }
 if(dem==N*N)break;
 }

 if(dem!=N*N)timthay=0;
 if(timthay==0)printf("\nKo tim thay");
 else printf("\nTim thay");
}

void main()
{
 clrscr();
 int a[M][M]={ 1, 2, 3, 4, 5,
 6, 7, 8, 9,10,
 11,12,13,14,15,
 16,17,18,19,20,
 21,22,23,24,25};


 int b[N][N]={4, 5,
 9,10};

 search(b,a);
 getch();
}