#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");
// 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;
}
#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;
}
#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;
}
// 函数定义
// 补足函数days_of_year的定义
// ×××
int days_of_year(int year, int month, int day)
{
int i,s=0,monthh[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
monthh[2] = 29;
for (i = 1; i < month; i++)
s = s + monthh[i];
s = s + day;
return s;
}
#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 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;
}
// 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");
}
// 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bubble_sort()实现
double average(int x[], int n)
{
int i, s=0;
for (i = 0; i < n; i++)
{
s += x[i];
}
s /= n;
return s;
}
void bubble_sort(int x[], int n)
{
int i, j,t;
for (i = 0; i <= n - 1; i++)
for (j = 0; j <= n - 1 - i; j++)
if (x[j] < x[j + 1])
{t = x[j];
x[j ] = x[j+1];
x[j + 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);
dec2n(x, 8);
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;
}
// 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dec2n实现
// ×××
void dec2n(int x, int n)
{
int j, i, k, v[1000];
int m[18] = { 0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H' };
if (n == 2)
for (i=0;x;i++)
{
v[i] = x % 2;
x/= 2;
}
if (n == 8)
for (i = 0; x; i++)
{
v[i] = x % 8;
x /= 8;
}
if (n == 16)
for (i = 0; x; i++)
{
v[i] = x% 16;
x/=16;
}
for (j = 0; j <= i - 1; j++)
if (v[i - j - 1 ]>= 10)
printf("%c", m[v[i - j - 1]]);
else
printf("%d", v[i - j - 1]);
printf("\n");
}
#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
// 补足函数实现
// ×××
void func(int x[][N], int n)
{
int i, j,m=1;
for (i = 0; i < n; i++)
{
x[i][i] = i + 1;
for (j = 0; j < n-i; j++)
{
x[i][j+i] = x[i][i];
}
for (j = 0; j < i; j++)
{
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);
// 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;
}
#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;
}
#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;
}
//函数定义
void bubble_sort(char str[][M], int n) {
int i, j;
char t[M];
for (j = 0; j < n - 1; j++)
for (i = 0; i < n - 1 - j; i++)
if (strcmp(str[i], str[i + 1]) > 0)
{
strcpy_s(t, str[i]);
strcpy_s(str[i], str[i + 1]);
strcpy_s(str[i + 1], t);
}
}
