实验四

wdnmd

#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，4

2.是，1

3.是    是

#define _CRT_SECURE_NO_WARNINGS
#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;
}

　　

 

 1.是 4

2.是 1

 

#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 a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int s=0,i;
    
    for(i=1;i<=month-1;++i)
    {
        s+=a[i];
    }
    
    if(year%4==0&&year%100!=0)
       s+=1; 
    
    return (s+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");
}
// 计算整型数组x中n个元素均值，并返回
// 补足函数average()实现
double average(int x[], int n)
{
    double s=0.0,aver;
    int i;
    for(i=0;i<n;++i)
    {
        s+=x[i];
    }
    aver=s/n;
    return aver;
    
}
// 对整型数组x中的n个元素降序排序
// 补足函数sort()实现
void sort(int x[], int n)
{
    int i,j,temp;
    for(i=0;i<n-1;++i)
    {
        for(j=0;j<n-i-1;++j)
        {
            if(x[j]<x[j+1])
            {
                temp=x[j];
                x[j]=x[j+1];
                x[j+1]=temp;
            }
        }
    }
}

　　

 

 

#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");
}

　　

 

 

 

 

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int main()
{
    int a[80][80];
    int n, i, j, k, t;

    printf("Enter n:");
    while (scanf("%d", &n) != EOF)
    {
        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                if (j == 0) { a[i][j] = 1; continue; }
                else if (j >= i) { a[i][j] = i+1; continue; }
                else a[i][j] = a[i][j - 1]+1;
            }
        }

        for (k = 0; k < n; k++)
        {
            for (t = 0; t < n; t++)
            {
                printf("%d ", a[k][t]);
            }

            printf("\n");
        }

        printf("\n");

        printf("Enter n:");

    }

    return 0;
}

　　

 

 

#define _CRT_SECURE_NO_WARNINGS
#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 i;
 

    printf("original views:\n");
    printf("views1:%s\n", views1);
    printf("views2:%s\n", views2);

    printf("\n");

    for (i = 0; i < N; i++)
    {
        views1[20] = views1[i];
        views1[i] = views2[i];
        views2[i] = views1[20];
    }

    printf("swapping...\n");

    printf("views1:%s\n", views1);
    printf("views2:%s\n", views2);

    return 0;
}

　　

 

 

#define _CRT_SECURE_NO_WARNINGS
#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 buf[10086];

    for (i = 1; i < n; i++)
    {
        for (j = 0; j < n - i; j++)
        {
            if (strcmp(str[j], str[j + 1]) > 0)
            {
                strcpy(buf, str[j]);
                strcpy(str[j], str[j + 1]);
                strcpy(str[j + 1], buf);
            }
        }
    }
}