#include<stdio.h>
const int N = 4;

int main()
{
    int a[N] = {2,0,2,1};
    char b[N] = {'2','0','1','1'};
    int i;
    
    printf("sizeof(int) = %d\n",sizeof(int));
    printf("sizeof(char) = %d\n",sizeof(char));
    printf("\n");
    
    for(i = 0;i < N; ++i)
    printf("%x: %d\n",&a[i],a[i]);
    
    printf("\n");
    
    for(i = 0;i < N; ++i)
    printf("%x: %c\n",&b[i],b[i]);
    
    return 0;
    
    

 

#include<stdio.h>

int main()
{
    int a[2][3] = {{1,2,3},{4,5,6}};
    char b[2][3] = {{'1','2','3'},{'4','5','6'}};
    int i,j;
    
    printf("sizeof(int) = %d\n",sizeof(int));
    printf("sizeof(char) = %d\n",sizeof(char));
    printf("\n");
    
    for(i = 0;i < 2; ++i)
       for(j = 0;j < 3; ++j)
         printf("%x: %d\n",&a[i][j],a[i][j]);
    
    printf("\n");
    
    for(i = 0;i < 2; ++i)
        for(j = 0; j < 3;++j)
          printf("%x: %c\n",&b[i][j],b[i][j]);
    
    
    
 } 

 

#include<stdio.h>

#define N 1000
int fun(int n, int m, int bb[N])
{
    int i, j, k = 0,flag;
    
    for(j = n; j <= m;j++)
    {
        flag = 1;
        for(i = 2; i<j;i++)
        if(j%i == 0)
        {
            
            flag = 0;
            break;
        }
        if(flag==1)
        bb[k++] = j;
        
    }
    
    return k;
}
int main()

{
    int n = 0,m = 0,i,k,bb[N];
    
    scanf("%d",&n);
    scanf("%d",&m);
    
    for (i = 0;i<m - n;i++)
       bb[i] = 0;
    
    k = fun(n,m,bb);
    
    for(i = 0;i < k;i++)
       printf("%4d",bb[i]);
       
       return 0;    
    
 } 

 

#include<stdio.h>
const int N = 5;

int find_max(int x[],int n);
void input(int x[],int n);
void output(int x[],int n);

int main()
{
    int a[N];
    int max;
    
    input(a,N);
    output(a,N);
    max = find_max(a,N);
    
    printf("max = %d\n",max);
    return 0;
    
}


void input(int x[],int n)
{
    int i;
    
    for(i = 0;i < n; ++i)
    scanf("%d",&x[i]);    
    
}


void output(int x[],int n)
{
    int i;
    
    for(i = 0; i < n;++i)
      printf("%d",x[i]);
    printf("\n");
}    


int find_max(int x[],int n)
{
    int i,max;
        max = x[0];
    for(i = 1;i<n;i++)
    {
        if(max<x[i])
        max = x[i];
        
        
    }
    
    return max;
    
 } 

 

#include<stdio.h>
void dec2n(int x, int n);

int main()
{
    int x;
    
    printf("输入一个十进制整数：");
    scanf("&d",&x);
    
    dec2n(x,2);
    dec2n(x,8);
    dec2n(x,16);
    
   return 0; 
    
}


void dec2n(int x,int n)
{
    int i,j,m,k = 0,a[1000];
    while(x!=0)
{
    m = x%n;
    a[k++] = m;
    
    x = x/n;
}
    for(j = k;j>=0;j--)
    {
        if(a[j]<=9)
        printf("%d",a[j]);
        else 
        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;
         } 
        
    }
     printf("\n") ; 

}

 

#include<stdio.h>
int main()
{
    int i,j,n,m,k;
    printf("Enter n:");
    while(scanf("%d",&n)!=EOF)
    {
        int a[n][n];
        for(i = 0;i<n;i++)
        { 
           for(j = i;j<n;j++)
          {
            a[i][j]=i + 1;
            a[j][i]=i + 1;
            }
        }
     
    for(m = 0;m<n;m++)
    {
        for(k = 0;k<n;k++)
        {
            printf("%d",a[m][k]);
        }
        printf("\n");
     } 
    
     printf("Enter n:");
    
    } 
}