实验4

实验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("%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 4
int main()
{
    int a[N][M] = { {1,9,8,4},{2,0,2,2} };
    char 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]);
    printf("\n");
    return 0;
}

实验2

#include<stdio.h>
#define N 13
int day_of_year(int year, int month, int day);
int main()
{
    int year, month, day;
    int days;
    while (scanf_s("%d%d%d", &year, &month, &day) != EOF)
    {
        days = day_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 day_of_year(int year, int month, int day)
{
    int t[N] = { 0,31,0,31,30,31,30,31,31,30,31,30,31 };
    int i, j, sum = 0;
    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
        t[2] = 29;
    else
        t[2] = 28;
    for (i = 1; i < month; i++)
        sum = sum + t[i];
    for (j = 1; j <= day; j++)
        sum = sum + 1;
    return sum;
}

实验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输出课程平均分:%.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_s("%d", &x[i]);
    printf("\n");
}
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 aver = 0;
    for (i = 0; i < n; i++)
        s += x[i];
    aver = s / n;
}
void bubble_sort(int x[], int n)
{
    int i,j, t;
    for(j=0;j<n-1;j++)
        for(i=0;i<n-j-1;i++)
            if (x[i] < x[i + 1])
            {
                t = x[i];
                x[i] = x[i + 1];
                x[i + 1] = t;
            }
}

 实验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_s("%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)
{
    char a[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
    char b[N];
    int t, i,j;
    for (i = 0; x > 0; i++)
    {
        t = x % n;
        b[i] = a[t];
        x = x / n;
    }
    for (j = i - 1; j >= 0; j--)
        printf("%c", b[j]);
    printf("\n");
}

实验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_s("%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;
        }
}

实验6

 

#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 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;
}

#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("view1:%s\n",views[0]);
    printf("view2:%s\n",views[1]);
    strcpy(t,views[0]);
    strcpy(views[0],views[1]);
    strcpy(views[1],t);
    printf("交换后:\n");
    printf("view1:%s\n",views[0]);
    printf("view2:%s\n",views[1]);
    return 0;
}

实验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("输入初始名单:\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,t=N-2;
    char x[M];
    for(i=0;i<N-1;i++)
    {
        for(j=0;j<=t;j++)
        if(strcmp(str[j],str[j+1])>0)
        {
            strcpy(x,str[j]);
            strcpy(str[j],str[j+1]);
            strcpy(str[j+1],x);
        }
        t--;
    }
}