南京信息工程大学实验4(耿子尧）

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);

    return 0;
 }

1连续保存，四

2连续保存，一

 

 

1.2

#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;
 }

1一样，4

2一样，1

 

 

2

#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 flag=0;
    if(year%4==0&&year%100!=0||year%400==0)
    flag=1;
    int days=0;
    int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31},i;
    for(i=1;i<month;i++)
    {
        days+=a[i];
    }
    days+=day+flag;
    return days;

}

3

#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 i;
    double s=0.0;
    for(i=0;i<n;i++)
    s+=x[i];
    return(s/n);
}


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

 

 

4

#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=0,a[32];
    while(x>0)
    {
        a[i]=x%n;
        i=i+1;
        x=x/n;
    }
    if(n<=10)
    {

        for(i--;i>=0;i--)
        {
          printf("%d",a[i]);
        }
        printf("\n");
        return;
    }
    else
    {
        for(i--;i>=0;i--)
        {
            switch(a[i])
            {
                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;
                default:printf("%d",a[i]);break;
            }
        }
    }
    return ;
}

 

5

#include<stdio.h>
main()
{
    int n,i,j;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=i;j++)
        printf("%d ",j);
        for(j;j<=n;j++)
        printf("%d ",i);

        printf("\n");
    }
    return 0;
 }

 

6

#include<stdio.h>
#define N 80

int main()
{
    char views1[N] = "hey, c, i hate u.";
    char views2[N] = "hey, c, i love u.";
    printf("original views:\n");
    printf("views1: %s\n",views1);
    printf("views2: %s\n",views2);
    char temp;
    int i=0;
    while(views1[i]!='\0')
    {
        temp=views2[i];
        views2[i]=views1[i];
        views1[i]=temp;
        i++;
    }
    printf("\nswapping...\n");
    printf("views1: %s\n",views1);
    printf("views2: %s\n",views2);

    return 0;
}

7

#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 = 1; i < N; i++)
        printf("%s\n", name[i]);
    printf("\n排序中…\n");
    bubble_sort(name, N);
    printf("\n按字典输出名单：\n");
    for (i = 1; i < N; i++)
        printf("%s\n", name[i]);
    return 0;
}
void bubble_sort(char str[][M], int n)
{
    int i, j;
    char t[10];
    for(i=0;i<n-1;i++)
        for(j=0;j<n-i-1;j++)
            if (strcmp(str[j], str[j + 1]) > 0)
            {
                strcpy(t, str[j]);
                strcpy(str[j], str[j + 1]);
                strcpy(str[j + 1], t);
            }
}