实验4 数组应用编程

实验1

1.1

#define _CRT_SECURE_NO_WARNINGS
#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));//连续存放，每个元素占用4个字节
printf("sizeof(char) = %d\n", sizeof(char));//连续存放，每个元素占用1个字节
printf("\n");
// 输出一维int数组a中每个元素的地址、值
for (i = 0; i < N; ++i)
printf("%p: %d\n", &a[i], a[i]);
printf("\n");
// 输出一维char数组b中每个元素的地址、值
for (i = 0; i < N; ++i)
printf("%p: %c\n", &b[i], b[i]);
printf("\n");
// 输出数组名a和b对应的值
printf("a = %p\n", a);
printf("b = %p\n", b);

return 0;
}

 

 1.2

#define _CRT_SECURE_NO_WARNINGS
#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;
// 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;
}

 

 

int型二维数组a，在内存中是"按行连续存放"的，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

实验2

#define _CRT_SECURE_NO_WARNINGS
#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[13] = { 0,31,29,31,30,31,30,31,31,30,31,30,31 };
int b[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
int i, s = 0;
if (year % 4 == 0 && year % 100 != 0||year%400==0)
{
for (i = 0; i < month; i++)
{
s = s + a[i];

}
}
else
{
for (i = 0; i < month; i++)
{
s = s + b[i];

}

}
return s+day;
}

 

 

 

 实验3

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdio.h> 1
#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 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]);
}
// 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");
}
double average(int x[], int n) {
int i, s = 0;
double m;
for (i = 0; i < n; i++)
{
s = s + x[i];
}
m = 1.0*s / n;
return m;}
void bubble_sort(int x[], int n) {
int i, j, temp = 0;
for (i = 0; i < n - 1; i++)
{
for (j = 0; j < n - 1 - i; j++)
{
if (x[j] < x[j + 1])
{
temp = x[j];
x[j ] = x[j+1];
x[j+1] = temp;}}}}

 

 

实验4

 

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

#include <stdio.h>
#define N 100
void dec2n(int x, int n); // 函数声明
int main() {
int x;
printf("输入一个十进制整数: ");
while (scanf("%d", &x) != EOF) {
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
printf("\n输入一个十进制整数: ");
}
return 0;
}
void dec2n(int x, int n) {
int i, k = 0;
int a[1000]={0};
int s[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

 

while (x != 0) {

 

i = x % n;
a[k] = i;
k++;
x = x / n;
}
k--;
for (; k >= 0; k--)
printf("%c", s[a[k]]);
printf("\n");
}

 

 

 

实验5

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

#define N 100
// 函数声明
void func(int x[][N], int n); // 注意：两维数组作为形参的语法

void output(int x[][N], int n); // 注意：两维数组作为形参的语法
int main() {
int x[N][N];
int i, j, n;
printf("Enter n: ");
while (scanf("%d", &n) != EOF) {
func(x, n); // 注意：两维数组作为实参的语法
output(x, n); // 注意：两维数组作为实参的语法
printf("\nEnter n: ");
}
return 0;
}
// 函数定义
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] = j+1;
else
x[i][j] = i+1;
}

 

}

 

 

实验6

6.1

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

#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);
// 交换
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;
}

 

 

 

 6.2

#define _CRT_SECURE_NO_WARNINGS
#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]);
// 交换
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;
}

 

 

实验7

#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); // 函数声明
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); // 函数调用
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 t[100];
int i, j;
for(i=0;i<n-1;i++)
for (j = 0; j < n - 1 - i; j++)
{
if (strcmp(str[j], str[j + 1]) > 0)
{
strcpy(t, str[j]);
strcpy(str[j], str[j + 1]);
strcpy(str[j + 1], t);
}
}

}