实验四

#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;
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)
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 a,b;
b=0;
for(a=0;a<=n;a++)
if (x[a]>b)
b=x[a];
return b;
}

 

#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, k=0,j,m,a[1000];    
    while(x!=0)
    {m=x%n;
    a[k]=m;
    k++;      
    x=x/n;
    }    
    for(j=k-1;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;
    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(int z=0;z<n;z++){
            for(int x=0;x<n;x++){
                printf("%d ",a[z][x]);
                
            }
            printf("\n");
            
        }
            
        printf("Enter n:");    
    }
    return 0;
    
}