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;
}

 

#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;}

 

#include <stdio.h>
int days_of_year(int year, int month, int day);  // 函数声明
int main()
{
    int year, month, day;
    int days;
    while (scanf_s("%d%d%d", &year, &month, &day) != 0)  // 按下Ctrl+D终止
    {
        days=days_of_year(year, month, day);   // 函数调用
        printf("%4d-%02d-%02d是这一年的第%d天.\n\n", year, month, day, days);}
    return 0;}// 函数定义// 补足函数days_of_year的定义// xx
int days_of_year(int year, int month, int day)
{
    int hh, n, k,h;
    n = 0;
    h = month;
    hh = year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
    int yue[13] = { 0,31,28 + hh,31,30,31,30,31,31,30,31,30,31 };
    for (; month >= 0; month--)
    {
        n += yue[month];
    }
    k = n-yue[h]+day;
    return k;
}

 

#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 s;
    for(i=0;i<n;++i)
    {
        sum+=x[i];
    }
    s=1.0*sum/n;
    return s;
}
 
void sort(int x[],int n)
{
    int i,j,k;
    for(i=0;i<n;++i)
    {
        for(j=0;j<i;j++)
        {
                    if(x[i]>x[j])
        {
            k=x[i];
            x[i]=x[j];
            x[j]=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=1,k,j=0;
    
    while(x!=0)
    {
        i=x%n;
        a[j++]=i;
        x=x/n;
    }
    
    for(k=j-1;k>=0;k--)
    {
        if(a[k]>9&&a[k]<16)
            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); 
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 i,j;
    char t[M];
    for(j=1;j<n;j++)
    {
        for(i=0;i<n-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);
            }
        }        
    }
}