实验四

#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:%c\n", &b[i], b[i]);
    printf("a = %p\n", a);
    printf("b = %p\n", b);
    return 0;
}

#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;
}

#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;
}

#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
// ×××
// 对整型数组x中的n个元素降序排序
// 补足函数sort()实现
// ×××

double average(int x[], int n){
    int sum=0,ave=0;
    for(int i=0;i<5;i++)
sum=sum+x[i];
ave=sum/N;    
return ave;    
}
void sort(int x[], int n){
int i,j,t;
for(i=0;i<4;i++){
    for(j=0;j<4-i;j++){
    if(x[j]<x[j+1]){
        
        t=x[j];
        x[j]=x[j+1];
        x[j+1]=t;
    }                    
    }
}            
}

#include <stdio.h>
#include<math.h>
void dec2n(int x, int n); // 函数声明
int main()
{
int x;
printf("输入一个十进制整数: ");
scanf("%d", &x);
dec2n(x, 2); // 函数调用: 把x转换成二进制输出
dec2n(x, 8); // 函数调用: 把x转换成八进制输出
dec2n(x, 16); // 函数调用: 把x转换成十六进制输出
return 0;
}
// 函数定义
// 功能: 把十进制数x转换成n进制，打印输出
// 补足函数实现
void dec2n(int x, int n)
{
char arr[] = "0123456789ABCDEF";
    if(n==16){
if(x<=9)
         printf("%d\n",x );
         else
         char arr[] = "0123456789ABCDEF";
    char hex[16];
    int t = 0;
    int y = 0;
    while (x)
     {
        hex[t++] = arr[x%16]; 
        x = x/ 16;
    }
        for (y=t-1; y>=0; --y)
        printf("%c", hex[y]);
    
 }
   if(n==8){
       int a,b,sum=0,i=0;
       if(x<=9)
         printf("%d\n",x );
         else
         b=x/8;
         for(i=0;i<=b;i++){
         
       a = x%8;
       x = x/8;
       sum += a*pow(10,i);
}
       printf("%d\n",sum);
   }
    if(n==2){
    
    int q,w,e=0,r=0;
    if(x<=1)
         printf("%d\n",x );
         else
         w=x/2;
         for(r=0;r<=w;r++){
         q=x%2;
         x=x/2;
         e+=q*pow(10,r);
     }
         printf("%d\n",e);
}
}

#include<stdio.h>
int main()
{
    int a[100][100];
    int n;
    int i, j, k;
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
        for (j = i-1; j < n; j++)
            for (k = i-1; k < n; k++)
                a[j][k] = i;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < n; j++)
            printf("%3d", a[i][j]);
        printf("\n");
    }
    return 0;
}

#include <stdio.h>
#define N 80
int main()
{
char views1[N] = "hey, c, i hate u.";
char views2[N] = "hey, c, i love u.";
printf("original views:\n");
int i;
printf("views1:");
for( i=0;views1[i]!='\0';i++ )
printf("%c",views1[i]);
printf("\n");
printf("views2:");
for( i=0;views2[i]!='\0';i++ )
printf("%c",views2[i]);
printf("\n\n");
printf("swapping...\n");
views1[11]=views2[11];
views1[12]=views2[12];
views1[13]=views2[13];
views1[14]=views2[14];

printf("views1:");
for( i=0;views1[i]!='\0';i++ )
printf("%c",views1[i]);
printf("\n");
printf("views2:");
for( i=0;views2[i]!='\0';i++ )
printf("%c",views2[i]);
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 = 1; i < N; i++)
        printf("%s\n", name[i]);
    printf("\n排序中…\n");
    bubble_sort(name, N);
    printf("\n按字典输出名单：\n");
    for (i = 1; i < N; i++)
        printf("%s\n", name[i]);
    return 0;
}
void bubble_sort(char str[][M], int n)
{
    int i, j;
    char t[10];
    for(i=0;i<n-1;i++)
        for(j=0;j<n-i-1;j++)
            if (strcmp(str[j], str[j + 1]) > 0)
            {
                strcpy(t, str[j]);
                strcpy(str[j], str[j + 1]);
                strcpy(str[j + 1], t);
            }
}