C语言第四次实验

#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");
// 输出数组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.是；占用4个字节；

2.是；占用1个字节；

3.是；是；

#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;
}

是；4个；

是；1个；

#include <stdio.h>
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 x=0,b;
    if(year%4==0&&year%100!=0||year%400==0)
    {
        int a[12]={31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        for(b=0;b<month-1;b++)
        x+=a[b];
        x+=day;
    }
    else
    {
        int a[12]={31, 28, 31 ,30, 31, 30, 31, 31, 30, 31, 30, 31};
        for(b=0;b<month-1;b++)
        x+=a[b];
        x+=day;
    }
    return x;
}

#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 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;
}

void input(int x[], int n)
{
int i;
for(i=0; i<n; ++i)
scanf("%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,s=0;
     for(i=0;i<=n-1;i++)
     s+=x[i];
     return s/5.0;
}
void sort(int x[], int n)
{
  int i,r,h;
    for(h=0;h<5;h++)

        for(i=1;i<5;i++)
        {
            if(x[i]>x[i-1])
            {
                r=x[i];
                x[i]=x[i-1];
                x[i-1]=r;
            }
        }
}

#include <stdio.h>
void dec2n(int x, int n); 
int main()
{
int x;
printf("输入一个十进制整数: ");
scanf("%d", &x);
dec2n(x, 2); 
dec2n(x, 8); 
dec2n(x, 16);
return 0; 
}
void dec2n(int x, int n)
{
    int a[100];
    int count=0;
    do{
        a[count++]=x%n;
        x=x/n;
    }while(x!=0);
    for(int i=count-1;i>=0;i--)
    {
        if(a[i]<=9)
        printf("%d",a[i]);
        else
        printf("%c",a[i]-10+'A');
    }
    printf("\n");
}

#include<stdio.h>
int main()
{
    int i,a,b,n;
    printf("Ebter n: ");
    while(scanf("%d",&n)!=EOF)
    {
        for(i=1;i<=n;i++)
        {
            for(a=1;a<=n;a++)
            {
                b=i>a?a:i;
                printf("%3d",b);
            }
            printf("\n");
        }
        printf("Enter 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.";
    char step;
    int i=0;
    printf("oringinal views:\n");
    printf("views1: %s\n",views1);
    printf("views2: %s\n",views2);
    while(views1[i]!='\0')
    {
        step=views1[i];
        views1[i]=views2[i];
        views2[i]=step;
        i++;
    }
    printf("\nswapping...\n");
    printf("views1: %s\n",views1);
    printf("views2: %s\n",views2);
    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 a[M];
    for(i=0;i<N;i++)
    {
        for(j=0;j<N-1;j++)
        {
            if(strcmp(str[j],str[j+1])>0)
            {
                strcpy(a,str[j]);
                strcpy(str[j],str[j+1]);
                strcpy(str[j+1],a);
            }
        }
    }
}