task4
#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;
}
1.连续存放，四个
2.连续存放，一个
3.一样
任务2
#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", year, month, day, days);
}
return 0;
}
int days_of_year(int year, int month, int day)
{
int sum = 0, i;
for(i=1;i<month;i++)
{
if (i==1|| i == 3|| i == 5 || i == 7 || i == 8 || i == 10 || i == 12)
sum = sum + 31;
else if (i == 2)
{
if (year % 4 == 0 && year % 100 != 0)
sum = sum + 29;
else
sum = sum + 28;
}
else
sum = sum + 30;
}
sum = sum + day;
return sum;
}
任务三
#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_s("%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 i;
double sum = 0;
for (i = 0; i < n; i++)
sum = sum + x[i];
return sum / n;
}
void bubble_sort(int x[], int n)
{
int i, j, t;
for (i = 0; i < n - 1; i++)
for (j = 0; j < n - i - 1; j++)
{
if (x[j] < x[j + 1])
{
t = x[j];
x[j] = x[j + 1];
x[j + 1] = t;
}
}
}
任务4
#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_s("%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, num = 0;
char a[16] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
char b[100];
for (i = 0; x != 0; i++)
{
b[i] = a[x % n];
x = x / n;
num++;
}
for (i = num - 1; i >= 0; i--)
printf("%c", b[i]);
printf("\n");
}
任务5
#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 n;
printf("Enter n:");
while (scanf_s("%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 = i; j < n; j++)
{
x[i][j] = i + 1;
x[j][i] = i + 1;
}
}
任务6
#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_s(t, views1);
strcpy_s(views1, views2);
strcpy_s(views2, t);
printf("交换后:\n");
printf("views1:%s\n", views1);
printf("views2:%s\n", views2);
return 0;
}
任务7
#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); // 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)
{
int i, j;
char t[M];
for(i=0;i<n-1;i++)
for (j = 0; j < n - i - 1; j++)
{
if (strcmp(str[j], str[j + 1]) > 0)
{
strcpy_s(t, str[j]);
strcpy_s(str[j], str[j + 1]);
strcpy_s(str[j+ 1], t);
}
}
}
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