NHAP CHU

#include<stdio.h>

#include<conio.h>

void main()

{ char a[100];

int i=0,c;

clrscr();

printf("

Nhap vao 1 chuoi ky tu:

");

while ((c=getchar())!='

') a[i++]=c;

a[i]=NULL;

printf("%s

%d",a,i);

getch();

}

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DAO CHUOI

#include<stdio.h>

#include<conio.h>

void main()

{ char a[100];

int i,j,c;

i=j=0;

clrscr();

printf("

Nhap vao 1 chuoi ky tu:

");

while ((c=getchar())!='

')

{ a[i++]=c;

j++;

}

a[i]=NULL;

printf("

Cau sau khi dao nguoc:

");

for(i=j-1;i>=0;i--)

printf("%c",a[i]);

getch();

}

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SO NGUYEN TO

#include<stdio.h>

#include<conio.h>

void main()

{ int i,j,n,x,m;

int a[100];

m=-1;

j=0;

printf("

Nhap n:"); scanf("%d",&n);

for(i=0;i<n;i++)

{ printf("a[%d]=",i);

scanf("%d",&a[i]);

}

for(i=0;i<n;i++)

{ if(a[i]>1)

{ x=a[i]-1;

while(a[i]%x!=0) x--;

if(x==1)

{ a[j]=a[i];

m++;

j++;

}

}

}

if(m>=0)

{ printf("

So nguyen to cua day:

");

for(i=0;i<j;i++)

printf("%d\t",a[i]);

}

else printf("

Day khong co so nguyen to:");

getch();

}

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UCLN

#include<stdio.h>

#include<conio.h>

void main()

{ int i,j,UCLN,n;

int a[100];

printf("

Nhap n:"); scanf("%d",&n);

for(i=0;i<n;i++)

{ printf("a[%d]=",i);

scanf("%d",&a[i]);

}

UCLN=a[0];

for(i=1;i<n;i++)

if(UCLN>a[i]) UCLN=a[i];

for(i=0;i<n-1;i++)

{ while(a[i]%UCLN!=0) UCLN--;

}

printf("

UCLN=%d",UCLN);

getch();

}

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SO CHINH PHUONG

#include <conio.h>

#include <stdio.h>

#include <math.h>

void chinhphuong(int a[])

{ int i,j,*ps,*pe,n,b;

float k,m;

j=0;

ps=a;

pe=ps;

while(*pe) pe++;

n=pe-ps;

for(i=0;i<n;i++)

{ k=a[i];

m=sqrt(k);

b=m;

k=m-b;

if(k==0) j++;

}

printf("

So luong so chinh phuong co trong mang:%d",j);

}

void main()

{ int a[100],i,n;

clrscr();

printf("

Nhap n:"); scanf("%d",&n);

for(i=0;i<n;i++)

{ printf("a[%d]=",i);

scanf("%d",&a[i]);

}

chinhphuong(a);

getch();

}

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TONG PHAN SO

#include <stdio.h>

#include <conio.h>

typedef struct {int tuso, mauso;

} phanso;

phanso c;

int UCLN(int a, int b)

{ int y;

a= a>=0?a:-a;

b= b>=0?b:-b;

if(a>b) y=b;

else y=a;

while((a % y!=0)||(b % y!=0)) y--;

return y;

}

phanso uocluoc(phanso a)

{

c.tuso = a.tuso / UCLN(a.tuso, a.mauso);

c.mauso = a.mauso / UCLN(a.tuso, a.mauso);

return c;

}

void main()

{ int i,n;

phanso m[100];

printf("

Nhap n:"); scanf("%d",&n);

printf("

Nhap cac tuso va mauso:

");

for(i=0;i<n;i++)

{ printf("m[%d]:",i);

scanf("%d%d",&m[i].tuso,&m[i].mauso);

}

c.tuso=m[0].tuso;

c.mauso=m[0].mauso;

for(i=1;i<n;i++)

{ c.tuso = c.tuso * m[i].mauso + c.mauso * m[i].tuso;

c.mauso = c.mauso * m[i].mauso;

c=uocluoc(c);

}

printf("

Tong cac phan so sau khi gian luoc: %d/%d",c.tuso,c.mauso);

getch();

}

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IN GIA TRI KHAC NHAU

#include<stdio.h>

#include<conio.h>

void main()

{ int i,j,t,k,n;

int a[100];

printf("

Nhap n:"); scanf("%d",&n);

for(i=0;i<n;i++)

{ printf("a[%d]=",i);

scanf("%d",&a[i]);

}

for(i=0;i<n-1;i++)

for(j=i+1;j<n;j++)

{ k=a[i];

if(k==a[j])

{ for(t=j;t<n-1;t++)

a[t]=a[t+1];

n--;

}

}

printf("

Cac gia tri khac nhau cua day nay:

");

for(i=0;i<n;i++)

printf("%d\t",a[i]);

getch();

}

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