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;
}

 

 

 

1.是连续存放的，占4个字节

2.是连续存放的，占1个字节

3.是 是

#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;
// 输出二维数组a中每个元素的地址和值
for (i = 0; i < N; ++i)
for (j = 0; j < M; ++j)
printf("%p: %d\n", &a[i][j], a[i][j]);
printf("\n");
// 输出二维数组a中每个元素的地址和值
for (i = 0; i < N; ++i)
for (j = 0; j < M; ++j)
printf("%p: %c\n", &b[i][j], b[i][j]);
return 0;
}

 

 

 是 4个

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是这一年中的第%d天.\n\n", year, month, day, days);
    }
    return 0;
}
int days_of_year(int year, int month, int day)
{
    int n=0;
    int i;
    int x[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
        x[1] = 29;
    for (i = 0; i < month-1; i++)
        n = n + x[i];
    return n + day;
}

 

 

 

#include <stdio.h>
#define N 5
// 函数声明
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;
}
// 函数定义
// 输入n个整数保存到整型数组x中
void input(int x[], int n)
{
int i;
for(i=0; i<n; ++i)
scanf("%d", &x[i]);
}
// 输出整型数组x中n个元素
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;
    for(i=0;i<n;i++)
    s+=x[i];
    return s/n;
     
}
void sort(int x[],int n)
{
    int i,j,t;
    for(i=0;i<n-1;i++)
    {
       for(j=0;j<n-1-i;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[80];
       int i, j=0, k;
    do
    {
        i=x%n;
        a[j]=i;
        j++;
        x=x/n;
    }
    while(x);
    for(k=j-1;k>=0;k--)
    {
        if(a[k]>9)
           printf("%c",a[k]-10+'A');
        else
           printf("%d",a[k]);        
    }
    printf("\n");
   }

 

 

#include <stdio.h>
int main()
{
    int n,i,j; 
    
    while (printf("Enter n:"),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;
        }
    }
    for (j=0;j<n;j++)
    {
        for (i=j;i<n;i++)
        {
            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("\n");
   }
         return 0;
}

 

 

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

 

 

#include <stdio.h>
#include <string.h>
#define N 5
#define M 20
void bubble_sort(char str[][M], int n); // 函数声明
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); // 函数调用
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 i,j;
    char t[80];
    for(i=0;i<n-1;i++)
    {
       for(j=0;j<n-1-i;j++)
       {
        if(strcmp(str[j],str[j+1])>0)
        {
            strcpy(t,str[j]);
            strcpy(str[j],str[j+1]);
            strcpy(str[j+1],t);
        }
       }
    } 
}