实验四

实验4task1-1
#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;
}
int型数组a在内存中是连续存放，每个元素占用4个内存字节单元
char型数组b在内存中是连续存放，每个元素占用1个内存字节单元
一样

#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]);
return 0;
}
int型二维数组a在内存中是按行连续存放，每个元素占用4个内存字节单元
char型二维数组b在内存中是按行连续存放的，每个元素占用1个内存字节单元

 

#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 month,int day)
{
    int a,i;
    int b[N]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int days,ans=0;
    if(month==1)
    {
        days=day;
    }
    for(i=1;i<month;i++)
    {
        ans=ans+b[i];
    
    if(((year%4==0)&&(year%100!=0))||(year%400==0))
    {
        days=ans+day+1;
    }
    else
{
    days=ans+day;
}

}

return days;

}

 

#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 sum=0;
    int i;
    double ave;
    for(i=0;i<n;i++)
    {
        sum=sum+x[i];
    }
    ave=(double)sum/n;
    return ave; 
}

void bubble_sort(int x[],int n)
{
    int i,j,t;

    printf("\n");
    for(j=0;j<n;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;
    }

}

 

#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=0,j,k,p,a[100],b[100];
    char arr[20]
    if(n==2||n==8)
{
        do{
        a[i]=x%n;
        x=x/n;
        i++;
        j++;
    }while(x!=0);
    for(j=i-1;j>=0;j--)
    printf("%d",a[j]);
    printf("\n");
}
if(n==16)
{
    if(x==0)
    printf("0");
    while(x!=0)
    {
        b[++k]=arr[x%16];
        x=x/16;
    }
    for(p=k;p>0;p--)
    printf("%c",b[p]);
}

}

#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;
    

}
}

#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;
}

#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;
}

#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,t[100];
    int b[100];
    printf("\n");
    for(j=0;j<n;j++)
    for(i=0;i<n-j-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);
        
    }    
}