实验4

实验一

task1_1.

#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);
}

 

task1_2.

#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;
 } 

 

 

实验二

task2.

#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 s=0,i;
    if(year%4==0&&year%100!=0||year%400==0)
    {
        int a[12]={31,29,31,30,31,31,30,31,30,31};
        for(i=0;i<month-1;i++)
        s=s+a[i];
        s=s+day; 
    }
    else
    {
        int a[12]={31,28,31,30,31,31,30,31,30,31};
        for(i=0;i<month-1;i++)
        s=s+a[i];
        s=s+day; 
    }
    return 0;
}

 

 

实验三

task3.

#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("\n输出课程分数:\n");
    output(scores,N);
    printf("\n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;
            }
        }
    }
}

 

 

实验四

task4.

#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");
 }

 

 

实验五

task5.

#include <stdio.h>
#define N 30
int main()
{
    int a[N][N];
    int n;
    int i,j,k;
    printf("Enter n:" );
    while(scanf("%d",&n)!=EOF)
    {
        for(i=0;i<n;i++)
        {
            for(j=0;j<n;j++)
            {
                if(i<j)
                {
                    a[i][j]=i+1;
                }
                else
                {
                    a[i][j]=j+1;
                }
            }
        }
        for(i=0;i<n;i++)
        {
            for(j=0;j<n;j++)
            printf("%d ",a[i][j]);
            printf("\n");
        }
        printf("\nEnter n: ");
    }
    return 0;
 } 

 

 

实验六

task6.

#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\n");
    printf("swapping...\n\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;
 } 

 

 

实验七

task7.

#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[10];
     for(j=1;j<n;j++)
     {
         for(i=0;i<n-j-1;i++)
         {
            if(strcmp(str[i],str[i+1])>0)
             {
             strcpy(t,str[i]);
             strcpy(str[i],str[i+1]);
             strcpy(str[i+1],t);
            }
        }    
     }
 }