实验四

#include <stdio.h>
#include<stdlib.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");
// 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);
system("pause");
return 0;
}

 

#include <stdio.h>
#include<stdlib.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]);
system("pause");
return 0;
}

 

#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_s("%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 days = 0, ans;
int a[N] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
for (int i = 1; i < month; i++) {
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
a[2] = 29;
}
days = days + a[i];

}ans = days + day;
return ans;
}

 

#include<stdio.h>
#include<stdlib.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 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);
system("pause");
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_s("%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 sum = 0; double ans;
int i;
for (i = 0; i < n; i++) {
sum = sum + x[i];
}
ans = 1.0 * sum / n;
return ans;
}
void bubble_sort(int x[], int n) {
int t;
for (int j = 0; j < n; j++) {
for (int 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); // 函数声明
int main() {
int x;
printf("输入一个十进制整数: ");
while (scanf_s("%d", &x) != EOF) {
dec2n(x, 2); // 函数调用: 把x转换成二进制输出
printf("\n");
dec2n(x, 8); // 函数调用: 把x转换成八进制输出
printf("\n");
dec2n(x, 16); // 函数调用: 把x转换成十六进制输出
printf("\n");
printf("\n输入一个十进制整数: ");
}
return 0;
}
void dec2n(int x, int n) {
char c[100] = { 0 };
int i = 0, z;
char y[17] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
while (x != 0) {
z = x % n;
c[i++] = y[z];
x /= n;
}i--;
while (i >= 0) {
printf("%c", c[i]);
i--;
}
return;
}

 

#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_s("%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
// 功能：输出两维数组x中的数据，数据项n行、n列
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");
}
}
// 函数定义
// 功能：生成n行n列的左上拐矩阵，保存在两维数组x中
void func(int x[][N], int n) {
int i, j;
for (i = n - 1; i >= 0; i--) {
for (j = n - 1; j >= 0; j--) {
x[i][j] = i + 1;
x[j][i] = x[i][j];
}
}
}

 

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

#define N 80

int main() {
char views1[N] = "hey, c, I have not love you yet.";
char views2[N] = "hey, c, how can I love you？";
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);
system("pause");

return 0;
}

 

#include <stdio.h>
#include <string.h>
#include<stdlib.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]);
system("pause");

return 0;
}

//函数定义
//功能：使用冒泡排序法对二维数据str中的n个字符串按字典序排序
void bubble_sort(char str[][M], int n) {
int i,j;
char x[100];
for(j=0;j<N-1;j++)
for(i=0;i<N-j-1;i++)
if(strcmp(str[i],str[i+1])>0)
{
strcpy(x,str[i]);
strcpy(str[i],str[i+1]);
strcpy(str[i+1],x);
}
}