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");
// 输出数组a中每个元素的地址、值
for (i = 0; i < N; ++i)
printf("%p: %d\n", &a[i], a[i]);
printf("\n");
// 输出数组b中每个元素的地址、值
for (i = 0; i < N; ++i)
printf("%p: %c\n", &b[i], b[i]);
printf("\n");
// 输出数组名a和b对应的值
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是这一年的第%d天.\n\n", year, month, day, days);
    }
    
    return 0;
}


// 函数定义 
int days_of_year(int year, int month, int day)
{
    int a[11];
    int f=0, b=0, c=0, sum;
    
    a[0]=31;a[2]=31;a[4]=31;a[6]=31;a[7]=31;a[9]=31;a[11]=31;
    a[3]=30;a[5]=30;a[8]=30;a[10]=30;
    
    if(year%100==0)
    {
       if(year%400==0)
          f=1;  
    }
    
    else if(year%100!=0)
    {
        if(year%4==0)
          f=1;
    }
    
    if(f==1)
      a[1]=29;
    else if(f==0)
      a[1]=28;
    
    for(b=0; b<month-1; b++)
    {
        c+=a[b];
    }
    
    sum=c+day;
    
    return sum;
}

#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,ave;
for(i=0;i<n;i++)
sum=sum+x[i];
ave=sum/n;
return ave;
}
void sort(int x[],int n)
{
int i,j,k;
    for(i=0;i<n-1;i++)
    {
    for(j=0;j<n-1-i;j++)
    {
    if(x[j]<x[j+1])
    {
    k=x[j];
    x[j]=x[j+1];
    x[j+1]=k;
    }
    }
    }

#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 i, j, m, n;
   printf(" Enter n: ");
   while(scanf("%d",&n)!= EOF)
        {
           for(i=1;i<=n;i++)
           {
               for(j=1;j<=n;j++)
                  {
                    m=i>j?j:i;
                    printf("%3d",m);
                  } 
                printf("\n");
           }
           printf(" Enter 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[M];
    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);
            }
        }
    }
}