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("a = %p\n", a);
    printf("b = %p\n", b);
    return 0;
}

 

 

 

1.连续存放，每个元素占用4个内存字节单元

2.连续存放，每个元素占用1个内存字节单元

3.都是一样的

#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.是，4个

2.是，1个

#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("\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 sum = 0;
    for (i = 0; i < n; i++)
        sum = sum + x[i];
    return sum / N;
}
void sort(int x[], int n)
{
    int i, j;
    int t;
    for(i=0;i<n-1;i++)
        for(j=0;j<n-i-1;j++)
            if (x[j] < x[j + 1])
            {
                t = x[j];
                x[j] = x[j + 1];
                x[j + 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)
{
    int a[1000];
    int i;
    for (i = 0;x!=0; i++)
    {
        a[i] = x % n;
        x = x / n;
    }
    for (i = i - 1; i >= 0; i--)
    {
        if (a[i] == 10)
            printf("%c", 'A');
        else if (a[i] == 11)
            printf("%c", 'B');
        else if (a[i] == 12)
            printf("%c", 'C');
        else if (a[i] == 13)
            printf("%c", 'D');
        else if (a[i] == 14)
            printf("%c", 'F');
        else if (a[i] == 15)
            printf("%c", 'E');
        else if (a[i] <10)
            printf("%d", a[i]);
    }
    printf("\n");
}

 

 

 

#include<stdio.h>
int main()
{
    int a[100][100];
    int n;
    int i, j, k;
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
        for (j = i-1; j < n; j++)
            for (k = i-1; k < n; k++)
                a[j][k] = i;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < n; j++)
            printf("%3d", a[i][j]);
        printf("\n");
    }
    return 0;
}

 

 

 

#include <stdio.h> 
#define N 80 
#include <string.h>
int main() 
{ 
   char views1[N] = "hey, c, i hate u.";
   char views2[N] = "hey, c, i love u."; 
   char temp;
   int i = 0;
   printf("original views:\n");
   printf("views1: %s\n",views1);
   printf("views2: %s\n",views2);
   while(views1[i]!='\0')
   {
          temp = views1[i];
       views1[i] = views2[i];
       views2[i] = temp;
       i++;
       }
       printf("\nswapping...\n");
       printf("views1: %s\n",views1);
       printf("views2: %s\n",views2);
    
    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 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);
            }
}