第四次实践作业

#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: %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;
}

一丶int型数组a，在内存单元中连续存放，每个元素占用4个内存字节单元。

二丶char型数组b，在内存单元中连续存放，每个元素占用1个内存字节单元。

三丶数组名a对应的值和&a[0]一样,数组名b对应的值和&b[0]一样.

#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;

    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;
}

一丶按行连续存放，每个元素占用4个内存字节单元

二丶按行连续存放，每个元素占用1个内存字节单元

#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,s=0;
    double ave;
    for(i=0;i<n;++i)
        s+=x[i];
    ave=(double)s/n;
    
    return ave;
}

void sort(int x[],int n)
{
    int i,j,t;
    for(j=0;j<n-1;j++)
        for(i=n-1;i>0;--i)
        {
            if(x[i]>x[i-1])
            {
                t=x[i];
                x[i]=x[i-1];
                x[i-1]=t;
                
            }
            
        }
}

#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,s=0;
    double ave;
    for(i=0;i<n;++i)
        s+=x[i];
    ave=(double)s/n;
    
    return ave;
}

void sort(int x[],int n)
{
    int i,j,t;
    for(j=0;j<n-1;j++)
        for(i=n-1;i>0;--i)
        {
            if(x[i]>x[i-1])
            {
                t=x[i];
                x[i]=x[i-1];
                x[i-1]=t;
                
            }
            
        }
}

#include<stdio.h>
int main()
{
    int n,i,j,k;
    printf("Enter n:");
    while(scanf("%d",&n)!=EOF)
    {
        for(i=1;i<=n;++i)
        {
            for(j=1;j<=n;++j)
            {
                k=i>j?j:i;
                printf("%3d",k);
            }
            printf("\n");
        }
        printf("Enter n:");
    }
    return 0;
}

#include<stdio.h>
void output(char x[]);
void sort(char x[], char y[]);
#define N 80

int main()
{
char views1[N] = "hey,c,i hate u.";
char views2[N] = "hey,c,i love u.";

printf("original views:");

printf("\nviews1：");
output(views1);
printf("\nviews2：");
output(views2);

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

sort(views1, views2);

printf("\nviews1：");
output(views1);
printf("\nviews2：");
output(views2);

return 0;
}

void output(char x[])
{
for (int i=0; x[i] != '\0'; i++)
    printf("%c", x[i]);
}

void sort(char x[], char y[])
{
int temp;
for (int i = 0; x[i] != '\0'; i++)
{
    temp = x[i];
    x[i] = y[i];
    y[i] = temp;
}
}

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