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<blockquote data-quote="lamnhat" data-source="post: 93786" data-attributes="member: 84866">#include&lt;stdio.h&gt;#include&lt;conio.h&gt;#include&lt;stdlib.h&gt;#include&lt;time.h&gt;#include&lt;string.h&gt;#include&lt;math.h&gt;int ucln(int a,int b);int bcnn(int a,int b);int pstg(int a,int b);void fibo(int n);void shfibo(int n);int snt(int n);void lksnt(int n);void ptsnt(int n);int scp(int m);int shh(int n);int bsin(int n,int x);void caythong(int n);main(){int t=1,so,x,y,n,s;clrscr();while(t){&nbsp;printf(&quot;\n**********************************&quot;);&nbsp;printf(&quot;\n* 1:bai uoc so chung lon nhat *&quot;);&nbsp;printf(&quot;\n* 2:bai boi so chung nho nhat *&quot;);&nbsp;printf(&quot;\n* 3:bai rut gon phan so&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *&quot;);&nbsp;printf(&quot;\n* 4:bai day so fibo&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n* 5:bai tim so hang fibo&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n* 6:bai so nguyen to&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n* 7:bai liet ke so nguyen to&nbsp; &nbsp; &nbsp; *&quot;);&nbsp;printf(&quot;\n* 8:bai phan tich so nguyen to *&quot;);&nbsp;printf(&quot;\n* 9:bai so chinh phuong&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *&quot;);&nbsp;printf(&quot;\n* 10:bai so hoan hao&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n* 11:cay thong noens&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n* 12:bai gtgd cua ham sin&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n* 13:thoat&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; *&quot;);&nbsp;printf(&quot;\n*************************************&quot;);do{printf(&quot;\nnhap so de chon(1:2:3:4:5:6:7:8:9:10:11:12)&quot;);&nbsp; scanf(&quot;%d&quot;,&amp;so);}while(so&lt;1||so&gt;12);switch(so){case 1:{printf(&quot;\nnhap so nguyen a=&quot;);scanf(&quot;%d&quot;,&amp;x);&nbsp; printf(&quot;\nnhap so nguyen b=&quot;);scanf(&quot;%d&quot;,&amp;y);&nbsp; printf(&quot;\nso %d va so %d co ucln la:%d&quot;,x,y,ucln(x,y));&nbsp; ucln(x,y);&nbsp; getch();break;&nbsp; }&nbsp;case 2:{&nbsp; printf(&quot;\nnhap so nguyen a=&quot;);scanf(&quot;%d&quot;,&amp;x);&nbsp; &nbsp; printf(&quot;\nnhap so nguyen b=&quot;);scanf(&quot;%d&quot;,&amp;y);&nbsp; &nbsp; printf(&quot;\nso %d va so %d co bcnn la:%d&quot;,x,y,bcnn(x,y));bcnn(x,y);&nbsp; &nbsp;&nbsp; getch();break;}&nbsp;case 3:{printf(&quot;\nnhap tu so khac 0=&quot;);scanf(&quot;%d&quot;,&amp;x);&nbsp;&nbsp; printf(&quot;\nnhap mau so khac 0=&quot;);scanf(&quot;%d&quot;,&amp;y);&nbsp; if(pstg(x,y))printf(&quot;\nphan so da toi gian va rut gon=%d&quot;,x/y);&nbsp; else printf(&quot;\nphan so duoc rut gon =%d/%d&quot;,x/ucln(x,y),y/ucln(x,y));&nbsp; getch();break;}&nbsp;case 4:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp; printf(&quot;\nday so fibo co dang&quot;);&nbsp; fibo<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />;&nbsp; getch();break;}&nbsp;case 5:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp; printf(&quot;\nso hang fibo la:&quot;);shfibo<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />;&nbsp;&nbsp; getch();break;}&nbsp;case 6:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp;&nbsp; if(snt<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />)printf(&quot;\nso %d la so nguyen to&quot;,n);&nbsp;&nbsp; else printf(&quot;\nso %d ko phai la so nguyen to&quot;,n);&nbsp;&nbsp; getch();break;}&nbsp; case 7:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp;&nbsp; lksnt<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />;printf(&quot;\ncac so nguyen to la&quot;);&nbsp;&nbsp; getch();break; }&nbsp;case 8:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp; &nbsp;&nbsp; printf(&quot;\nso %d duoc phan tich la:&quot;,n);&nbsp; &nbsp;&nbsp; ptsnt<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />;getch();break;}case 9:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp; &nbsp; &nbsp;&nbsp; if(scp<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />)printf(&quot;\nso %d la so chinh phuong&quot;,n);&nbsp; &nbsp; &nbsp;&nbsp; else printf(&quot;\nso %d ko phai la so chinh phuong&quot;,n);&nbsp;getch();break;}case 10:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp;if(shh<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />)printf(&quot;\nso %d la so hoan hao&quot;);&nbsp;else printf(&quot;\nso %d ko la so hoan hao&quot;,n);&nbsp;getch();break;}case 11:{printf(&quot;\nnhap so dong cua cay thong:&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp; printf(&quot;\nCAY THONG NOENS:&quot;);caythong<img src="https://cdn.jsdelivr.net/gh/twitter/twemoji@14.0.2/assets/72x72/1f44e.png" class="smilie smilie--emoji" loading="lazy" width="72" height="72" alt="(n)" title="Thumbs down&nbsp; &nbsp; (n)"&nbsp; data-smilie="23"data-shortname="(n)" />;&nbsp; getch();break;}case 12:{printf(&quot;\nnhap n=&quot;);scanf(&quot;%d&quot;,&amp;n);&nbsp; &nbsp; &nbsp;&nbsp; printf(&quot;\nnhap x=&quot;);scanf(&quot;%d&quot;,&amp;x);&nbsp; &nbsp; printf(&quot;\ngia tri gan dung cua ham sin=%d&quot;,s);bsin(n,x);&nbsp; &nbsp; getch();break;}&nbsp;case 13:exit(0);&nbsp;}}}int ucln(int a,int b){while(a!=b){if(a&gt;=b)a-=b;&nbsp;else b-=a;}if(a==1)return b;else return a;}int bcnn(int a,int b){int x,y;x=a;y=b;return (x*y/ucln(a,b));}int pstg(int a,int b){if(ucln(a,b)==1)return 1;else return 0;}void fibo(int n){int i,a=1,b=1,fibo=0;for(i=1;i&lt;=n;i++){fibo+=a;printf(&quot;\n% d&quot;,a);a=b;b=fibo;}return;}void shfibo(int n){int i,a=1,b=1,sum=0;for(i=1;i&lt;=n;i++){sum+=a;a=b;b=sum;}printf(&quot;%d&quot;,sum);}int snt(int n){ int i=2;&nbsp; while((i&lt;=n/2)&amp;&amp;(n%i!=0))i++;&nbsp; if(i&gt;n/2)return 1;&nbsp;&nbsp; else return 0;}void lksnt(int n){int m,dem=0;&nbsp;for(m=2;m&lt;=n;m++)&nbsp;if(snt(m))&nbsp;{dem++;&nbsp;printf(&quot;%5d&quot;,m);&nbsp;if(dem%10==0)printf(&quot;\n&quot;);&nbsp;}}&nbsp;void ptsnt(int n)&nbsp;{int i=2;&nbsp;while(i&lt;=n)&nbsp;{if(n%i==0)&nbsp;{if(n/i==1)printf(&quot;%d&quot;,i);&nbsp;else printf(&quot;%d x&quot;,i);&nbsp;n/=i;}&nbsp;else i++;}}int scp(int m){if(sqrt(m)==(int)sqrt(m))return 1;else return 0;}int shh(int n){int i,tong=0;for(i=1;i&lt;=n;i++)if(n%i==0)tong+=i;if(tong==n)return 1;else return 0;}int bsin(int n,int x){int k,dau,u,s,c;u=x;s=x;dau=-1;for(k=1;k&lt;=n;k++){c=x*x/(2*k+1);u=u*c;s=s+dau*u;dau=-dau;dau,u,s,c;}return;}void caythong( int n)&nbsp;{int i,j;&nbsp; for(i=1;i&lt;=n;i++)&nbsp;for(j=1;j&lt;=2*i-1;j++)&nbsp;{gotoxy(40-i+j,i);&nbsp; printf(&quot;*&quot;);}&nbsp; for(i=1;i&lt;n/2;i++)&nbsp; {gotoxy(40,n+i);&nbsp; printf(&quot;*&quot;);}}</blockquote>

[QUOTE="lamnhat, post: 93786, member: 84866"] #include<stdio.h> #include<conio.h> #include<stdlib.h> #include<time.h> #include<string.h> #include<math.h> int ucln(int a,int b); int bcnn(int a,int b); int pstg(int a,int b); void fibo(int n); void shfibo(int n); int snt(int n); void lksnt(int n); void ptsnt(int n); int scp(int m); int shh(int n); int bsin(int n,int x); void caythong(int n); main() {int t=1,so,x,y,n,s; clrscr(); while(t) { printf("\n**********************************"); printf("\n* 1:bai uoc so chung lon nhat *"); printf("\n* 2:bai boi so chung nho nhat *"); printf("\n* 3:bai rut gon phan so *"); printf("\n* 4:bai day so fibo *"); printf("\n* 5:bai tim so hang fibo *"); printf("\n* 6:bai so nguyen to *"); printf("\n* 7:bai liet ke so nguyen to *"); printf("\n* 8:bai phan tich so nguyen to *"); printf("\n* 9:bai so chinh phuong *"); printf("\n* 10:bai so hoan hao *"); printf("\n* 11:cay thong noens *"); printf("\n* 12:bai gtgd cua ham sin *"); printf("\n* 13:thoat *"); printf("\n*************************************"); do {printf("\nnhap so de chon(1:2:3:4:5:6:7:8:9:10:11:12)"); scanf("%d",&so); }while(so<1||so>12); switch(so) {case 1:{printf("\nnhap so nguyen a=");scanf("%d",&x); printf("\nnhap so nguyen b=");scanf("%d",&y); printf("\nso %d va so %d co ucln la:%d",x,y,ucln(x,y)); ucln(x,y); getch();break; } case 2:{ printf("\nnhap so nguyen a=");scanf("%d",&x); printf("\nnhap so nguyen b=");scanf("%d",&y); printf("\nso %d va so %d co bcnn la:%d",x,y,bcnn(x,y));bcnn(x,y); getch();break;} case 3:{printf("\nnhap tu so khac 0=");scanf("%d",&x); printf("\nnhap mau so khac 0=");scanf("%d",&y); if(pstg(x,y))printf("\nphan so da toi gian va rut gon=%d",x/y); else printf("\nphan so duoc rut gon =%d/%d",x/ucln(x,y),y/ucln(x,y)); getch();break;} case 4:{printf("\nnhap n=");scanf("%d",&n); printf("\nday so fibo co dang"); fibo(n); getch();break;} case 5:{printf("\nnhap n=");scanf("%d",&n); printf("\nso hang fibo la:");shfibo(n); getch();break;} case 6:{printf("\nnhap n=");scanf("%d",&n); if(snt(n))printf("\nso %d la so nguyen to",n); else printf("\nso %d ko phai la so nguyen to",n); getch();break;} case 7:{printf("\nnhap n=");scanf("%d",&n); lksnt(n);printf("\ncac so nguyen to la"); getch();break; } case 8:{printf("\nnhap n=");scanf("%d",&n); printf("\nso %d duoc phan tich la:",n); ptsnt(n);getch();break;} case 9:{printf("\nnhap n=");scanf("%d",&n); if(scp(n))printf("\nso %d la so chinh phuong",n); else printf("\nso %d ko phai la so chinh phuong",n); getch();break;} case 10:{printf("\nnhap n=");scanf("%d",&n); if(shh(n))printf("\nso %d la so hoan hao"); else printf("\nso %d ko la so hoan hao",n); getch();break;} case 11:{printf("\nnhap so dong cua cay thong:");scanf("%d",&n); printf("\nCAY THONG NOENS:");caythong(n); getch();break;} case 12:{printf("\nnhap n=");scanf("%d",&n); printf("\nnhap x=");scanf("%d",&x); printf("\ngia tri gan dung cua ham sin=%d",s);bsin(n,x); getch();break;} case 13:exit(0); }}} int ucln(int a,int b) {while(a!=b) {if(a>=b)a-=b; else b-=a; }if(a==1)return b; else return a;} int bcnn(int a,int b) {int x,y; x=a;y=b; return (x*y/ucln(a,b)); } int pstg(int a,int b) {if(ucln(a,b)==1)return 1; else return 0;} void fibo(int n) {int i,a=1,b=1,fibo=0; for(i=1;i<=n;i++) {fibo+=a; printf("\n% d",a); a=b; b=fibo;}return; } void shfibo(int n) {int i,a=1,b=1,sum=0; for(i=1;i<=n;i++) {sum+=a; a=b; b=sum;} printf("%d",sum); } int snt(int n) { int i=2; while((i<=n/2)&&(n%i!=0))i++; if(i>n/2)return 1; else return 0;} void lksnt(int n) {int m,dem=0; for(m=2;m<=n;m++) if(snt(m)) {dem++; printf("%5d",m); if(dem%10==0)printf("\n"); }} void ptsnt(int n) {int i=2; while(i<=n) {if(n%i==0) {if(n/i==1)printf("%d",i); else printf("%d x",i); n/=i;} else i++;}} int scp(int m) {if(sqrt(m)==(int)sqrt(m))return 1; else return 0;} int shh(int n) {int i,tong=0; for(i=1;i<=n;i++) if(n%i==0)tong+=i; if(tong==n)return 1; else return 0;} int bsin(int n,int x) {int k,dau,u,s,c; u=x; s=x;dau=-1; for(k=1;k<=n;k++) {c=x*x/(2*k+1); u=u*c; s=s+dau*u; dau=-dau;dau,u,s,c; }return;} void caythong( int n) {int i,j; for(i=1;i<=n;i++) for(j=1;j<=2*i-1;j++) {gotoxy(40-i+j,i); printf("*");} for(i=1;i<n/2;i++) {gotoxy(40,n+i); printf("*");} } [/QUOTE]

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