Dấu sao tam giác vuông #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int n,i,j,k; printf ("\nBan hay nhap so nguyen duong n sao cho 0<n<25"); printf ("\nn=");scanf ("%d",&n); for (i=1;i<=n;i++) { for (j=1;j<=i;j++) printf ("*"); printf ("\n"); } getch(); } đọc số bằng chữ #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int a,b,c,n,k; k=0; do { printf ("\nBan hay nhap so n sao cho 0<n<1000"); printf ("\nn=");scanf ("%d",&n); if (n<1000) k=1; if (k==0) printf ("\nBan hay nhap lai n"); } while (k==0); a=n%10; n=n/10; b=n%10; n=n/10; c=n%10; printf ("\nSo ban vua nhap vao la: "); switch(c) { case 0:printf (" ");break; case 1:printf ("mot ");break; case 2:printf ("hai ");break; case 3:printf ("ba "); break; case 4:printf ("bon ");break; case 5:printf ("nam ");break; case 6:printf ("sau ");break; case 7:printf ("bay ");break; case 8:printf ("tam ");break; case 9:printf ("chin ");break; default:break; } if (c!=0) printf ("tram "); if ((c!=0)&&(b==0)) printf ("linh "); if (b!=0) { switch(b) { case 1:printf ("muoi ");break; case 2:printf ("hai ");break; case 3:printf ("ba "); break; case 4:printf ("bon ");break; case 5:printf ("nam ");break; case 6:printf ("sau ");break; case 7:printf ("bay ");break; case 8:printf ("tam ");break; case 9:printf ("chin ");break; default:break; } } if (b>1) printf ("muoi "); else printf (" "); switch(a) { case 0:printf (" ");break; case 2:printf ("hai ");break; case 3:printf ("ba "); break; case 4:printf ("bon ");break; case 5:printf ("nam ");break; case 6:printf ("sau ");break; case 7:printf ("bay ");break; case 8:printf ("tam ");break; case 9:printf ("chin ");break; } getch(); } ucln,bcnn #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int a,b,c,i,USCLN,BSCNN; printf ("\nBan hay nhap 2 so nguyen duong a va b"); printf ("\na=");scanf ("%d",&a); printf ("\nb=");scanf ("%d",&b); for (i=1;i<=a;i++) { 1 if ((a%i==0)&&(b%i==0)) USCLN=i; } printf ("\nUoc so chung lon nhat la %d",USCLN); BSCNN=(a*b)/USCLN; printf ("\nBoi so chung nho nhat la %d",BSCNN); getch(); } sao hình tam giác #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int n,i,j,k; printf ("\nBan hay nhap so nguyen duong n sao cho 0<n<25"); printf ("\nn=");scanf ("%d",&n); for (i=1;i<=n;i++) { for (j=1;j<=n-i;j++) printf (" "); for (j=1;j<=2*i-1;j++) printf ("*"); printf ("\n"); } getch(); } dấu sao tam giác vuông_bài 8 #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int n,i,j,k; printf ("\nBan hay nhap so nguyen duong n sao cho 0<n<25"); printf ("\nn=");scanf ("%d",&n); for (i=1;i<=n;i++) { for (j=1;j<=n-i;j++) printf (" "); for (j=1;j<=i;j++) printf ("*"); printf ("\n"); } getch(); } in ra chữ số lẻ #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int m,n,d,t; printf ("\nBan hay nhap vao so nguyen duong n"); printf ("\nn=");scanf ("%d",&n); m=n; t=0; while (m!=0) { d=m%10; m=m/10; if (d%2==1) { printf ("\nCac chu so le cua %d la %d ",n,d); t=1; } } if (t==0) printf ("\n%d khong co chu so le nao",n); getch(); } viết 00 đến 99 #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int i,j; for (i=0;i<=9;i++) { for (j=0;j<=9;j++) printf ("%7d",i*10+j); printf ("\n"); } getch(); } nhập số nguyên dương không quá 4 số #include"stdio.h" #include"conio.h" 2 #include"math.h" void main()/*Luu y n la kieu nguyen nen khi nhap n khong qua 32767*/ { clrscr(); int k,n,m,d,t; k=0; t=0; do { printf ("\nBan hay nhap n la so co khong qua 4 chu so"); printf ("\nn=");scanf ("%d",&n); if (n<10000) k=1; if (k==0) printf ("\nBan hay nhap lai n"); } while (k==0); m=n; while (d!=0) { d=m%10; m=m/10; t=t+d; } printf ("\nTong cac chu so cua %d la %d",n,t); getch(); } in ra tam giác số #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int n,i,j,k; printf ("\nBan hay nhap so nguyen duong n sao cho 0<n<25"); printf ("\nn=");scanf ("%d",&n); for (i=1;i<=n;i++) { for (j=1;j<=n-i;j++) printf (" "); for (j=1;j<=i;j++) printf ("%d",j); for (j=1;j<=i-1;j++) printf ("%d",i-j); printf ("\n"); } getch(); } các số xuất hiện hơn 1 lần 1 dãy #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int a[50],n,i,j,tg,k; printf ("\nBan hay nhap n"); printf ("\nn=");scanf ("%d",&n); printf ("\nNhap cac phan tu trong day:"); for (i=1;i<=n;i++) { printf ("\nPhan tu thu %d la ",i);scanf ("%d",&a[i]); } for (i=1;i<n;i++) for (j=i+1;j<=n;j++) if (a[i]>a[j]) { tg=a[i]; a[i]=a[j]; a[j]=tg; } k=0; printf ("\nCac so xuat hien nhieu hon 1 lan trong day la: "); for (i=1;i<n;i++) if (a[i]==a[i+1]) { printf ("%d ",a[i]); for (j=i+1;j<=n;j++) if (a[i]!=a[j]) { i=j-1; break; } } getch(); } diện tích tam giác #include"math.h" #include"conio.h" #include"stdio.h" void main() /*Tinh dien tich tam giac*/ { clrscr(); float a,b,c,p,dientich; printf ("Ban hay nhap chieu dai 3 canh cua tam giac a,b,c"); printf ("\na=");scanf ("%f",&a); printf ("\nb=");scanf ("%f",&b); printf ("\nc=");scanf ("%f",&c); 3 if ((a+b>c)&&(b+c>a)&&(c+a>b)) { p=(a+b+c)/2; dientich=sqrt(p*(p-a)*(p-b)*(p-c)); printf ("\nDien tich tam giac la %f",dientich); } else printf ("\na,b,c khong phai 3 canh cua 1 tam giac"); getch(); } pt bậc 2 #include"math.h" #include"conio.h" #include"stdio.h" void main() /*Giai phuong trinh bac 2*/ { clrscr(); float a,b,c,denta; printf ("Ban hay nhap 3 so a,b,c"); printf ("\na=");scanf ("%f",&a); printf ("\nb=");scanf ("%f",&b); printf ("\nc=");scanf ("%f",&c); denta=b*b-4*a*c; if (denta<0) printf ("\nPhuong trinh vo nghiem"); else if (denta==0) printf ("\nPhuong trinh co nghiem kep x1=x2=%f",-b/2*a); else printf ("\nPhuong trinh co 2 nghiem \nx1=%f \nx2=%f",(-b-sqrt(denta))/2*a,(- b+sqrt(denta))/2*a); getch(); } pt bậc 4 #include"stdio.h" #include"math.h" #include"conio.h" void main() /*Giai phuong trinh bac 4*/ { clrscr(); float a,b,c,denta; printf ("\nBan hay nhap 3 so a,b,c"); printf ("\na=");scanf ("%f",&a); printf ("\nb=");scanf ("%f",&b); printf ("\nc=");scanf ("%f",&c); denta=b*b-4*a*c; if (denta<0) printf ("\nPhuong trinh vo nghiem"); else if (denta==0) printf ("\nPhuong trinh co 2 nghiem \nx1=%f \nx2=%f",(-sqrt(-b/2*a)), (sqrt(-b/2*a))); else printf ("\nPhuong trinh co 4 nghiem phan biet \nx1=%f \nx2=%f \nx3=%f \nx4= %f",(-sqrt((-b+sqrt(denta))/2*a)),(sqrt((- b+sqrt(denta))/2*a)),(-sqrt((-b- sqrt(denta))/2*a)),(sqrt((-b-sqrt(denta))/2*a))); getch(); } tìm số lớn nhất trong 3 số #include"math.h" #include"conio.h" #include"stdio.h" void main() /*Tim so lon nhat trong 3 so*/ { clrscr(); float a,b,c,max; printf ("Ban hay nhap 3 so a,b,c"); printf ("\na=");scanf ("%f",&a); printf ("\nb=");scanf ("%f",&b); printf ("\nc=");scanf ("%f",&c); if (a>b) max=a; else max=b; if (max<c) max=c; printf ("\nSo lon nhat trong 3 so la %f",max); getch(); } bảng cửu chương #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int i,j; for (i=1;i<=10;i++) { for (j=1;j<=10;j++) printf ("%7d",i*j); printf ("\n"); } getch(); } F=x/1!+x2/2!+…+xn/n! #include"stdio.h" #include"conio.h" #include"math.h" 4 void main() { clrscr(); float x,f; int n,sh,a,i; printf ("Ban hay nhap n va x"); printf ("\nx=");scanf ("%f",&x); printf ("\nn=");scanf ("%d",&n); sh=1; f=0; a=1; for (i=1;i<=n;i++) { sh=sh*x; a=a*i; f=f+(float)(sh)/a; } printf ("\nGia tri cua bieu thuc la f=%f",f); getch(); } mức tăng dân số hàng năm #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int x,z,t; float y; printf ("\nBan hay nhap x,y,z"); printf ("\nDan so the gioi hien tai la ");scanf ("%d",&x); printf ("\nMuc tang dan so hang nam la ");scanf ("%f",&y); printf ("\nDan so the gioi trong tuong lai ");scanf ("%d",&z); t=0; while (x<z) { x=x+x*(float)(y)/100; t++; } printf ("\nSo nam de dan so vuot qua %d nguoi la %d ",z,t); getch(); } in ra n ở dạng nhị phân #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int m,n,d,t,k; printf ("\nBan hay nhap vao so nguyen duong n"); printf ("\nn=");scanf ("%d",&n); m=n; t=0; k=0; while (m!=0) { d=m%2; m=m/2; t=t+d*pow(10,k); k++; } printf ("\nDang nhi phan cua %d la %d",n,t); getch(); } in ra n ở hệ đếm cơ số 16 #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); int a[50],d,m,n,i,j; printf ("Ban hay nhap n"); printf ("\nn=");scanf ("%d",&n); m=n; i=0; while (m!=0) { d=m%16; m=m/16; i=i+1; a[i]=d; } printf ("\n%d bieu dien duoi dang co so 16 la:",n); for (j=i;j>=1;j ) switch (a[j]) { case 10:printf ("A");break; case 11:printf ("B");break; case 12:printf ("C");break; case 13:printf ("D");break; case 14:printf ("E");break; case 15:printf ("F");break; default:printf ("%d",a[j]); } getch(); } 5 in ra màn hình những số nguyên tố < n #include"conio.h" #include"math.h" #include"stdio.h" void main() { clrscr(); int n,i,j,kt; printf ("\nBan hay nhap n"); printf ("\nn=");scanf ("%d",&n); for (i=1;i<n;i++) { kt=1; for (j=2;j<=i-1;j++) if (i%j==0) { kt=0; break; } if (kt==1) printf ("\nSo nguyen to nho hon n la %d",i); } getch(); } in ra những số hoàn hảo < n #include"conio.h" #include"math.h" #include"stdio.h" void main() { clrscr(); int n,i,j,t; printf ("\nBan hay nhap n"); printf ("\nn=");scanf ("%d",&n); for (i=1;i<n;i++) { t=0; for (j=1;j<=i;j++) if (i%j==0) t=t+j; if (t/i==2) printf ("\nSo hoan hao nho hon n la %d",i); } getch(); } in ra màn hình giá trị biểu thức f(x,y) #include"conio.h" #include"math.h" #include"stdio.h" void main() { clrscr(); float x,y,f; printf ("\nBan hay nhap x,y"); printf ("\nx=");scanf ("%f",&x); printf ("\ny=");scanf ("%f",&y); if (x<y) f=2*x-y*y+2; if (x==y) f=exp(x*y-y)+sin(x-3*y); if (x>y) f=log(x*x*x-2*x*y) +sqrt(x*x+2*y*y); printf ("\nGia tri bieu thuc la %f",f); getch(); } S=1 k + 2 k +….+3 k #include"conio.h" #include"stdio.h" #include"math.h" void main() { clrscr(); int n,k,i,s; printf ("\nBan hay nhap 2 so n va k"); printf ("\nn=");scanf ("%d",&n); printf ("\nk=");scanf ("%d",&k); s=0; for (i=1;i<=n;i++) s=s+pow(i,k); printf ("\nGia tri cua tong voi n=%d va x=%d la %d",n,k,s); getch(); } f(a,b)=3a 2 b -|a-b| +e 2a+1 #include"conio.h" #include"math.h" #include"stdio.h" void main() { clrscr(); float x,f,a,b; printf ("\nBan hay nhap x"); printf ("\nx=");scanf ("%f",&x); if (x<1) a=abs(x*x-3*x+2)+sin(2*x-1); else if (1<=x<=2) a=sqrt(x*x-1)-log(x- 1)/log(3); else a=exp(2*x+3)-pow(x,5)+3; b=pow(x,5)-3*x*x+2; f=3*a*a*b-abs(a-b)+exp(2*a+1); printf ("\nGia tri bieu thuc la: %f",f); getch(); } 6 ! 1 )1 ( !3 1 !2 1 !1 1 1 n s n + −++−= #include<stdio.h> #include<conio.h> #include<math.h> float s=0;int n,i,gt=1; void main() {clrscr(); printf("\nnhap n=");scanf("%d",&n); for(i=1;i<=n;i++) {gt=gt*i; s=s+pow(-1,i+1)*(1/float(gt)); } printf("\ntong co gia tri la:%4.1f",s); getch(); } nhập a,b,c thỏa mãn độ dài 3 cạnh tam giác #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); float a,b,c; int k; k=0; do { printf ("\nBan hay nhap a,b,c la do dai 3 canh 1 tam giac"); printf ("\na=");scanf ("%f",&a); printf ("\nb=");scanf ("%f",&b); printf ("\nc=");scanf ("%f",&c); if ((a>0)&&(b>0)&&(c>0)&&(a+b>c)&&(b+c> a)&&(c+a>b)) k=1; if (k==0) printf ("\Ban hay nhap lai a,b,c"); } while (k==0); printf ("\nDo dai 3 canh cua tam giac ban vua nhap la \na=%f\nb=%f\nc=%f",a,b,c); getch(); } chu vi, diện tích, đường cao tam giác #include"stdio.h" #include"conio.h" #include"math.h" void main() { clrscr(); float a,b,c,p,s; int k; k=0; do { printf ("\nBan hay nhap a,b,c la do dai 3 canh 1 tam giac"); printf ("\na=");scanf ("%f",&a); printf ("\nb=");scanf ("%f",&b); printf ("\nc=");scanf ("%f",&c); if (a>0)&&(b>0)&&(c>0)&&(a+b>c)&&(b+c>a )&&(c+a>b)) k=1; if (k==0) printf ("\Ban hay nhap lai a,b,c"); } while (k==0); p=(a+b+c)/2; s=sqrt(p*(p-a)*(p-b)*(p-c)); printf ("\nChu vi cua tam giac la %f",2*p); printf ("\nDien tich cua tam giac la %f",s); printf ("\nDo dai cua 1 duong cao la %f",2*s/a); getch(); } mảng 1 chiều #include"conio.h" #include"stdio.h" #include"math.h" void nhap(int a[50],int *n) { int i; printf ("\nBan hay nhap n"); printf ("\nn=");scanf ("%d",n); printf ("\nNhap cac phan tu trong day A:\n"); for (i=1;i<=*n;i++) { printf ("\nNhap phan tu thu %d= ",i); scanf ("%d",&a[i]); } } void hienthi(int a[50],int n) { int i; printf ("\nDay A ban vua nhap la: "); for (i=1;i<=n;i++) printf ("%d ",a[i]); printf ("\n"); } void soam(int a[50],int n) { int i,k,t; k=0; for (i=1;i<=n;i++) 7 if (a[i]<0) { k=1; t=i; break; } if (k==0) printf ("\nDay A vua nhap khong co so am"); else printf ("\nVi tri so am dau tien trong day A tu trai sang phai la %d",t); } void slt2(int a[50],int n) { int i,j,tg; for (i=1;i<n;i++) for (j=i+1;j<=n;j++) { if (a[i]>a[j]) { tg=a[i]; a[i]=a[j]; a[j]=tg; } } printf ("\nSo lon thu nhi trong day A la %d",a[n-1]); } void xapxep(int a[50],int n) { int i,j,tg; for (i=1;i<n;i++) for (j=i+1;j<=n;j++) { if ((a[i]%2==0)&&(a[j]%2!=0)) { tg=a[i]; a[i]=a[j]; a[j]=tg; } } printf ("\nDay A da xap xep la: "); for (i=1;i<=n;i++) printf ("%d ",a[i]); } void kt(int a[50],int n) { int i,j,k; k=0; for (i=1;i<n;i++) for (j=i+1;j<=n;j++) { if (a[i]*a[j]<0) k=1; else k=0; } if (k==1) printf ("\nDay A la day dan dau"); else printf ("\nDay A khong phai day dan dau"); } void tbc(int a[50],int n) { int i,t; float tbc; t=0; for (i=1;i<=n;i++) t=t+a[i]; tbc=(float)(t)/n; printf ("\nTrung binh cong cac so trong day A la %f",tbc); } void so(int a[50],int n) { int i,j,k; k=0; printf ("\nCac so trong day xuat hien nhieu hon mot lan la: "); for (i=1;i<n;i++) { for (j=i+1;j<=n;j++) if (a[i]==a[j]) { a[j]=a[j+1]; n=n-1; k=1; } if (k==1) printf ("%d ",a[i]); } } void snt(int a[50],int n) { int i,j,tg,k; for (i=1;i<n;i++) for (j=i+1;j<=n;j++) { if (a[i]>a[j]) { tg=a[i]; a[i]=a[j]; a[j]=tg; } if (a[i]>a[j]) { for (k=j;k<n;k++) a[k]=a[k+1]; n=n-1; i=i-1; } } void main() { int a[50],n,k; 8 nhap(a,&n); hienthi(a,n); soam(a,n); slt2(a,n); xapxep(a,n); kt(a,n); tbc(a,n); so(a,n); snt(a,n); getch(); } mảng 2 chiều #include<stdio.h> #include<conio.h> /*nhap mang hai chieu*/ void nhap(int A[10][10],int*n) {int i,j,tg; printf("nhap kich thuoc ma tran n=");scanf("%d",n ); for (i=1;i<=*n;i++) for (j=1;j<=*n;j++) { printf("nhap cac phan tu hang %d cot %d=",i,j); scanf("%d",&tg); A[i][j]=tg; } } /*hien thi A ra man hinh*/ void hienthi(int A[10][10],int n) { int i,j; printf ("ma tran vua nhap:"); for (i=1;i<=n;i++) { for (j=1;j<=n;j++) printf ("%3d",A[i][j]); printf("\n"); } } /*tim phan tu nho nhat tren ma tran*/ void sonhonhat(int A[10][10],int n) { int min,i,j; min=A[1][1] ; for (i=1;i<=n;i++) for (j=1;j<=n;j++) if (A[i][j]<min)min=A[i][j]; } /*hien thi cac phan tu hang chan*/ void hienthihangchan(int A[10][10],int n) { int i,j; printf ("cac phan tu tren cac hang co chi so chan \n:"); for (i=1;i<=n;i++) { if (i%2==0) { printf("\n cac phan tu tren hang %d",i); for (j=1;j<=n;j++) printf ("%3d",A[i][j]); printf("\n"); } }} /*xap xep cac ham theo thu tu tang dan*/ void xapxephang(int A[10][10],int n) { int i,j,k,tg; printf ("nhap hang k="); scanf ("%d",k); for (i=1;i<=n;i++) for (j=1;j<=n;j++) if (A[k][i]<A[k][j]) { A[k][i]=A[k][j]; A[k][j]=tg; } printf ("ma tran sau khi xap xep hang %d",k); for (i=1;i<=n;i++) { for (j=1;j<=n;j++) printf ("%3d",A[i][j]); printf("\n"); }} /*voi k mot so bat ky nhap tu ban phim in ra so lan xuat hien cua k trong ma tran*/ void solanxuathien(int A[10][10],int n) { int k ,d,i,j; printf ("nhap k="); scanf("%d",&k); d=0; for (i=1;i<=n;i++) for (j=1;j<=n;j++) if (A[i][j]==k)d++; printf("so lan xuat hien cua %d trong ma tran la %d,k,d"); } /*tim phan tu nho nhat tren duong cheo chinh ma tran*/ void phantunhonhat(int A[10][10],int n) { int min,i,j; min= A[1][1]; 9 for (i=2;i<=n;i++) if (A[i][j]<min ) min =A[i][j]; printf ("so nho nhat la %2d",min); } /*tinh va in ra trung binh cong cac phan tu tren duong cheo ma tran*/ void tcc(int A[10][10],int n) { int i,t=0; for (i=1;i<=n;i++) t=t+A[i][i]; printf ("trung binh cong cac phan tu tren duong cheo chinh=%35.1f",(float)n); } /*tich hai ma tran*/ void tich(int A[10][10],int B[10][10],int n) { int C[10][10],i,j,k; for (i=1;i<=n;i++) for (j=1;j<=n;j++) { C[i][j]=0; for (k=1;k<=n;k++)C[i][j]=A[i][j]*B[i][j]; printf ("tich hai ma tran la %f",C[i][j]); } } /*in ra man hinh cac phan tu trong vung duoc danh dau cua ma tran A*/ void in( int A[10][10],int n) { int i,j; for (i=1;i<=n;i++) { for (j=1;j<=n;j++) printf ("%3d",A[i][j]); printf ("\n"); } } /*so sanh cac phan tu am va phan tu duong trong ma tran*/ void sosanh(int A[10][10],int n) { int dd,da,i,j; for(i=1;i<=n;i++) for (j=1;j<=n;j++) if (A[i][j]<0)da++; else if (A[i][j]>0)dd++; if (da>dd)printf ("so luong phan tu am lon hon"); else printf("so luong phan tu am nho hon hoac bang so luong phan tu duong"); } /*in ra man hinh hang co tong lon nhat*/ void inhangmax(int A[10][10],int n) { int max,h,i,j,t; t=0; for (i=1;i<=n;i++) t=t+A[1][i];max=t,h=1; for (i=2;i<=n;i++) {t=0; for (j=1;j<=n;j++) t=t+A[i][j]; if (t>max){max=t;h=i;} for (i=1;i<=n;i++) printf("%2d",A[h][i]); } } void main() { clrscr(); int A[10][10],n; nhap(A,&n); hienthi(A,n); hienthihangchan(A,n); xapxephang(A,n); getch(); } ma trận vuông #include<stdio.h> #include<conio.h> int a[15][15]; int i,j; void main() {clrscr(); for(j=0;j<=9;j++) {a[0][j]=j;printf("%3d",a[0][j]);} printf("\n"); i=1; while(i<=9) {for(j=0;j<=9;j++) {a[i][j]=a[i-1][j]+10; printf("%3d",a[i][j]); } printf("\n"); i++; } getch(); } 10 . canh cua tam giac ban vua nhap la a=%f b=%f c=%f",a,b ,c) ; getch(); } chu vi, diện tích, đường cao tam gi c #include"stdio.h" #include"conio.h" #include"math.h" void. /*hien thi cac phan tu hang chan*/ void hienthihangchan(int A[10][10],int n) { int i,j; printf ("cac phan tu tren cac hang co chi so chan :"); for