实验4

#include <stdio.h>
#define N 4

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

#include <stdio.h >
#define N 2
#define M 3

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

#include <stdio.h>

int days_of_year(int year,int month,int day);

int main()
{
    int year,month,day;
    int days;
    
    while(scanf("%d%d%d",&year,&month,&day)!=EOF)
    {
        days=days_of_year(year,month,day);
        printf("%4d-%02d-%02d是这一年的第%d天.\n\n",year,month,day,days);
        
    }
    
    return 0;
}

int days_of_year(int year,int month,int day)
{
    int i,t=0;
    if(year%4==0&&year%100!=0 || year%400==0)
    {
        int a[12]={31,29,31,30,31,30,31,31,30,31,30,31};
        for(i=0;i<month-1;i++)
        t=t+a[i];
        t=t+day;
    }
    else
    {
        int a[12]={31,30,31,30,31,30,31,31,30,31,30,31};
        for(i=0;i<month-1;i++)
        t=t+a[i];
        t=t+day;
    }
    return t;
}

#include <stdio.h>
#define N 5

void input(int x[],int n);
void output(int x[],int n);
double average(int x[],int n);
void sort(int x[],int n);

int main()
{
    int scores[N];
    double ave;
    
    printf("录入%d个分数:\n",N);
    input(scores, N);
    
    printf("录入%d个分数:\n",N);
    output(scores, N);
    
    printf("\n输出课程分数处理:计算均分、排序...\n");
    ave=average(scores, N);
    sort(scores, N);
    
    printf("\n输出课程均分:%.2f\n",ave);
    printf("\n输出课程分数（高->低）:\n");
    output(scores, N);
    
    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");
}

double average(int x[],int n)
{
    int sum=0,i;
    double ave;
    for(i=0;i<n;i++)
    {
        sum=sum+x[i];
    }
    ave=sum*1.0/N;
    return ave;
}

void sort(int x[],int n)
{
    int i,j,t;
    for(j=1;j<n;j++)
    {
        for(i=0;i<n;i++)
        {
            if(x[i]<x[i+1])
            {
                t=x[i];
                x[i]=x[i+1];
                x[i+1]=t;
            }
        }
     } 
}

#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)
{
    char a[100];
    int i,k,j=0;
    for(i=0;x!=0;i++,j++)
    {
        k=x%n;
        if(k>=10)
        {
            a[i]='A'+k-10;
        }
        else
        {
            a[i]='0'+k;
        }
        x=x/n;
    }
    
    for(i=j-1;i>=0;i--)
    {
    printf("%c",a[i]);
}
    printf("\n");
}

#include <stdio.h>

int main()
{
    int n,i,j;
    printf("Enter n:");
    while(scanf("%d",&n)!=0)
    {
        for(i=1;i<=n;i++)
        {
            for(j=1;j<=n;j++)
            {
                if(i==1)
                {
                    printf("%d",i);
                }
                else
                {
                    if(j<=i)
                    {
                    printf("%d",j);
                }
                else
                {
                    printf("%d",i);
                }
                }
            }
            printf("\n");
        }
    }
    return 0;
}

#include <stdio.h>
#define N 80

int main()
{
    int i,j;
    char t;
    char views1[N]="hey,c,i hate u.";
    char views2[N]="hey,c,i love u.";
    
    printf("otiginal views:\n");
    printf("views1:");
    for(i=0;i<N;i++)
    printf("%c",views1[i]);
    printf("\nviews2:");
    for(j=0;j<N;j++)
    printf("%c",views2[j]);
    printf("\n");
    
    printf("swapping...\n");
    
    for(i=0;i<N;i++)
    for(j=0;j<N;j++)
    if(i=j)
    {
        t=views1[i];
        views1[i]=views2[i];
        views2[i]=t;
    }
    
    printf("views1:");
    for(i=0;i<N;i++)
    printf("%c",views1[i]);
    printf("\nviews2:");
    for(j=0;j<N;j++)
    printf("%c",views2[j]);
    printf("\n");
    
    return 0;
}

#include <stdio.h>
#include <string.h>

#define N 5
#define M 20

void bubble_sort(char str[][M],int n);

int main()
{
    char name[][M]={"Bob","Bill","Joseph","Taylor","George"};
    int i;
    
    printf("输出初始名单:\n");
    for(i=0;i<N;i++)
    printf("%s\n",name[i]);
    
    printf("\n排序中...\n");
    bubble_sort(name,N);
    
    printf("\n按字典序输出名单:\n");
    for(i=0;i<N;i++)
    printf("%s\n",name[i]);
    
    return 0;
}

void bubble_sort(char str[][M],int n)
{
    int j,i;
    char t[M];
    for(j=1;j<=n;j++)
    {
        for(i=0;i<n;i++)
        {
            if(strcmp(str[i],str[i+1])>0)
            {
            strcpy(t,str[i]);
            strcpy(str[i],str[i+1]);
            strcpy(str[i+1],t);
        }
        }
}
}