计算机7班李程远实验四作业

实践任务1.1

#include<stdio.h>
#define N 4
int main()
{
    int a[N]={1,9,8,4};
    char b[N]={'1','9','8','4'};
    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("a=%p\n",a);
    printf("b=%p\n",b);
    return 0;
}

实践任务1.2

#include<stdio.h>
#define N 2
#define M 4
int main()
{
    int a[N][M]={{1,9,8,4},{2,0,2,2}};
    int b[N][M]={{'1','9','8','4'},{'2','0','2','2'}};
    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;
}

连续，4个；

连续，1个；

相同；

实践任务2

#include <stdio.h>
#define N 13
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 mouth, int day)
{
    int days=0;
    int a;
    int ans[14]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    for(int i=0;i<mouth;i++)
    days=days+ans[i];
    if(year%4==0&&year%100!=0||year%400==0)
    return days+day+1;
    else 
    return days+day;
}

实践任务3

#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 bubble_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);
    bubble_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 ave;
    int s=0;
    for(int i=0;i<n;i++)
    s=s+x[i];
    ave=s/n;
    return ave;
}
void bubble_sort(int x[],int n)
{
    int i,j,t;
    for(j=1;j<n;j++)
    for(i=1;i<n-j;i++)
    if(x[i]<x[i+1])
    t=x[i],x[i]=x[i+1],x[i+1]=t;
    for(i=0;i<N;i++)
    printf("%d",x[i]);
}

实践任务4

#include <stdio.h>
#define N 100
void dec2n(int x, int n); 
int main() {
    int x;
    printf("输入一个十进制整数: ");
    while(scanf("%d", &x) != EOF) {
        dec2n(x, 2);  
        dec2n(x, 8);  
        dec2n(x, 16); 
        printf("\n输入一个十进制整数: ");
    }
    return 0;
}
void dec2n(int x,int n)
{
    int i,j=0;
    char b[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
char a[N];
while(x!=0)
{
    i=x%n;
    x=x/n;
    a[j++]=b[i];
}
while(j>=0)
    printf("%c",a[--j]);
printf("\n");
}

实践任务5

#include <stdio.h>
#define N 100
void func(int x[][N], int n);   
void output(int x[][N], int n); 

int main() {
    int x[N][N];
    int i, j, n;
    printf("Enter n: ");
    while(scanf("%d", &n) != EOF) {
        func(x, n);     
        output(x, n);   
        printf("\nEnter n: ");
    }
    return 0;
}
void output(int x[][N], int n) {
    int i, j;
    for(i = 0; i < n; ++i) {
        for(j = 0; j < n; ++j) 
            printf("%5d", x[i][j]);     
        printf("\n");
    }
}
void func(int x[][N],int n)
{
    int i,j;
    for(i = 0; i < n; ++i)
 { 
       for(j = 0; j < n; ++j)
    {
         if(i<j)
         x[i][j]=i+1;
         else
         x[i][j]=j+1;
    }
 }
}

实践任务6.1

#include <stdio.h>
#include <string.h>

#define N 80

int main() {
    char views1[N] = "hey, C, I have not love u yet.";
    char views2[N] = "hey, C, how can I love u?";
    char t[N];

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

    strcpy(t, views1);
    strcpy(views1, views2);
    strcpy(views2, t);

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

    return 0;
}

实践任务6.2

#include <stdio.h>
#include <string.h>

#define N 80

int main() {
    char views[2][N] = {"hey, C, I have not love u yet.", "hey, C, how can I love u."} 

    char t[N];

    printf("交换前: \n");
    printf("views1: %s\n", views[0]);
    printf("views2: %s\n", views[1]);

    strcpy(t, views[0]);
    strcpy(views[0], views[1]);
    strcpy(views[1], t);

    printf("交换后: \n");
    printf("views1: %s\n", views[0]);
    printf("views2: %s\n", views[1]);

    return 0;
}

二维相较于一维是把两句话作为两行的内容进行位置的交换

实践任务7

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