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/* Bai tap 1_93 - In tat ca cac uoc so cua so n */ #include #include void main() { int n, i; printf("Cho gia tri N = "); scanf("%d", &n); printf("Cac uoc so cua %d la :\n", n); for (i=1; im) n -= m; else m -= n; if (n == 0) return m; else return n;
CÁc bài tập C căn bản P4 --------------------------------- /* Bai tap 1_93 - In tat ca cac uoc so cua so n */ #include <stdio.h> #include <conio.h> void main() { int n, i; printf("Cho gia tri N = "); scanf("%d", &n); printf("Cac uoc so cua %d la :\n", n); for (i=1; i<n; i++) if ((n % i) == 0) printf("%5d", i); getch(); } ---------------------------- #include <stdio.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(); } ---------------------------- /* Xem tap tin cho phep cuon */ #include <stdio.h> #include <conio.h> void main() { FILE *fp; char filename[50], s[255], *hang[1000], c; int nline = 0, line = 0, i; printf("\nNhap ten tap tin muon xem : "); gets(filename); if ((fp = fopen(filename,"r")) == NULL) printf("\nKhong the mo tap tin %s", filename); else { while (!feof(fp)) { fgets(s, 255, fp); hang[nline] = (char *)malloc(strlen(s)); strcpy(hang[nline], s+1); nline++; } do { clrscr(); i = line; while (i<line+26 && i<nline) printf("%s", hang[i++]); c = getch(); if (c == 0) { c = getch(); switch(c) { case 72 : if (line > 0) line--; break; case 80 : if (line+25 < nline) line++; break; } } } while (c != 27); fclose(fp); } } --------------------------- /* Bai tap 9_5 - Tim so tu trong chuoi */ #include <stdio.h> #include <string.h> #include <conio.h> #pragma warn -pia char *trim(char *chuoi) { char *p; while (p = strstr(chuoi, " ")) memmove(p, p+1, strlen(chuoi) - (p - chuoi)); if (chuoi[0] == ' ') memmove(chuoi, chuoi+1, strlen(chuoi) - 1); if (chuoi[strlen(chuoi)-1] == ' ') chuoi[strlen(chuoi)-1] = 0; return chuoi; } void main() { char chuoi[125]; int i = 0, count = 0; printf("\nNhap chuoi mau : "); textattr(0x1e); gets(chuoi); trim(chuoi); if (strlen(chuoi)) { while(chuoi[i] != 0) if (chuoi[i++] == ' ') count++; count++; } printf("\nSo tu co trong chuoi : %d", count); getch(); } -------------------------------------- -------------------------------- #include <stdio.h> void main() { char s[100]; int i; printf("\nNhap vao mot chuoi : "); gets(s); i = 0; while (s[i] != 0) { if (isalpha(s[i])) if (s[i] < 97) s[i] += 32; else s[i] -= 32; i++; } printf("\nChuoi bien thanh : %s", s); getch(); } --------------------------------------- /* Bai tap 5_3 - Tim phuong an doi tien */ #include <stdio.h> #define TONGSOTIEN 300000 void main() { long i, j, k, l, m, count=0, soluong = 0; for (i=0; i<=TONGSOTIEN/1000; i++) for (j=0; j<=TONGSOTIEN/2000; j++) for (k=0; k<=TONGSOTIEN/5000; k++) for (l=0; l<=TONGSOTIEN/10000; l++) for (m=0; m<=TONGSOTIEN/20000; m++) { if ((i*1000 + j*2000 + k*5000 + l*10000 + m*20000) == TONGSOTIEN) printf("\n%5ld - %5ld%5ld%5ld%5ld%5ld", ++count, i, j, k, l, m); soluong++; } printf("so luong = %ld", soluong); getch(); } ----------------------------------------- /* Bai tap 9_4 - Tim chuoi doi xung */ void main() { char chuoi[125]; int i = 0, j; printf("\nNhap vao chuoi kiem tra : "); gets(chuoi); j = strlen(chuoi) - 1; while(chuoi[i++] == chuoi[j--]) ; if (--i>=++j) printf("Chuoi doi xung"); else printf("Chuoi khong doi xung"); getch(); } ------------------------------------------ /* Bai tap 1_87 - Demo ve hop dung conio */ #include <conio.h> #include <stdlib.h> #include <dos.h> char doublebox[] ="ÉÍ»ºÈ¼"; char singlebox[] ="ÚÄ¿³ÀÙ"; void swap(int *x, int *y) { int temp; temp = *y; *y = *x; *x = temp; } void drawbox(int x1, int y1, int x2, int y2, int type) { char *boxtype; int i; if (type == 2) boxtype = doublebox; else boxtype = singlebox; gotoxy(x1,y1); cprintf("%c", boxtype[0]); for (i=x1 + 1; i < x2; i++) cprintf("%c", boxtype[1]); cprintf("%c", boxtype[2]); for (i=y1+1; i<y2; i++) { gotoxy(x1, i); cprintf("%c", boxtype[3]); gotoxy(x2, i); cprintf("%c", boxtype[3]); } gotoxy(x1,y2); cprintf("%c", boxtype[4]); for (i=x1 + 1; i < x2; i++) cprintf("%c", boxtype[1]); cprintf("%c", boxtype[5]); } void drawbox_color(int x1, int y1, int x2, int y2, int type, int color) { if (x1>x2) swap(&x1, &x2); if (y1>y2) swap(&y1, &y2); textattr(color); window(x1, y1, x2, y2); clrscr(); window(1,1,80,25); drawbox(x1, y1, x2, y2, type); } void main() { int x1, y1, x2, y2, type, color; cprintf("\n\rDRAWBOX DEMO.\n\rPress any key to begin ."); getch(); randomize(); while (!kbhit()) { x1 = random(80); do { x2 = random(80); } while (x1 == x2); y1 = random(25); do { y2 = random(25); } while (y1 == y2); type = random(2) + 1; color = random(256); drawbox_color(x1,y1,x2,y2,type,color); delay(100); } } ----------------------------------------- #include <stdio.h> void main() { double fahrenheit, celsius; printf("\nNhap gia tri do Fahrenheit : "); scanf("%lf", &fahrenheit); if (fahrenheit != 32.0) { celsius = 5.0 * (fahrenheit-32.0) / 9.0 ; printf("Do Celsius tuong ung = %5.2lf", celsius); } getch(); } ---------------------------------------- /* Bai tap 1_21 - In day so Fibonanci */ #include <stdio.h> void main() { int n, i, fib1 = 1, fib2 = 1, fib = 2; printf("\nNhap gia tri N : "); scanf("%d", &n); printf("%d %d ", fib1, fib2); while (fib1+fib2 < n) { fib = fib1 + fib2; printf("%d ", fib); fib2 = fib1; fib1 = fib; } getch(); } ------------------------------------ /* Bai tap 1_68 - Tap hop thong tin */ #include <stdio.h> void main() { char s[100], s1[100], s2[100], filename1[50], filename2[50]; FILE *fp1, *fp2; printf("\nCho viet ten tap tin thu nhat : "); gets(filename1); if ((fp1 = fopen(filename1, "w+")) == NULL) printf("\nKhong the tao tap tin %s", filename1); else { printf("\nCho viet ten tap tin thu nhat : "); gets(filename2); if ((fp2 = fopen(filename2, "w+")) == NULL) printf("\nKhong the tao tap tin %s", filename2); else { do { printf("\nHo ten (ENTER de ket thuc) : "); gets(s); if (strlen(s) > 0) { strcat(s, "\n"); fputs(s, fp1); printf("\nTuoi : "); gets(s); strcat(s, "\n"); fputs(s, fp1); printf("\nDia chi : "); gets(s); strcat(s, "\n"); fputs(s, fp1); } } while (strlen(s) > 0); fclose(fp1); fp1 = fopen(filename1, "r"); while (fgets(s, 100, fp1) != NULL) { fgets(s1, 100, fp1); fgets(s2, 100, fp1); s[strlen(s)-1] = 0; s1[strlen(s1)-1] = 0; fprintf(fp2, "%s %s %s", s, s1, s2); } fclose(fp2); } } } ------------------------------------------ /* Bai tap 1_86 - Doc va ghi len file mot mang 2 chieu 10x10 */ #include <stdio.h> #define MAX 10 char filename[] = "MANG1010.DAT"; void main() { int mang[MAX][MAX], i, j; FILE *fp; if ((fp = fopen(filename, "w+")) == NULL) printf("\nKhong the tao tap tin %s", filename); else { printf("\nNhap cac phan tu cua mang : "); for (i=0; i<MAX; i++) for (j=0; j<MAX; j++) { printf("\nMang[%d][%d] = ", i, j); scanf("%d", &mang[i][j]); } fwrite(&mang, sizeof(int), MAX * MAX, fp); fclose(fp); printf("\nViec ghi hoan tat."); } getch(); } --------------------------------------- /* Bai tap 3_1 - Ham tinh N! */ #include <stdio.h> unsigned long giaithua(int n) { unsigned long ketqua = 1; int i; for (i=2; i<=n; i++) ketqua *= i; return ketqua; } void main() { int n; printf("\nNhap vao gia tri N : "); scanf("%d", &n); printf("%d! = %lu", n, giaithua(n)); getch(); } ---------------------------------- #include <stdio.h> void main() { int a[10], i; printf("\nNhap vao 10 phan tu nguyen cua day : "); for (i=0; i<10; i++) scanf("%d", &a[i]); i = 1; while (a[i] <= a[i-1] && i<10) i++; if (i==10) printf("Day da cho la day giam"); else printf("Day da cho khong la day giam"); getch(); } ------------------------------------------------ /* Bai tap 2_6 - Cho biet goc thuoc goc vuong nao */ #include <stdio.h> void main() { int goc; printf("\nNhap vao gia tri goc : "); scanf("%d", &goc); printf("Goc do thuoc goc vuong thu %d", (goc/90)%4 + 1); getch(); } ---------------------------------- /* Bai tap - Bai toan Gonbach */ #include <stdio.h> [...]... 25); cprintf("Nhap chuoi 4 so khac nhau tu 1 den 6"); } void nhapso() { char c; int i; for (i=0; i '4' || c . C c bài tập C căn bản P4 --------------------------------- /* Bai tap 1_93 - In tat ca cac uoc so cua so n */ #include <stdio.h> #include <conio.h>. while ( (c = fgetc(fp)) != EOF) putc (c, stdout); } getch(); } -------------------------------------- /* Bai tap 1_15 - Tinh dien tich cac hinh hoc */ #include