实验四
task.1-1
#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: %c\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.连续,4个字节
2.连续,1个字节
3.都一样
task.1-2
#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; // 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; }
1.是,4个字节单元
2.是,1个字节单元
task.2
#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 s=0,i,days; int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; for(i=0;i<month;i++) { s=s+a[i]; } if(year%4==0&&year%100!=0||year%400==0) s=s+1; days=s+day; return days; }
task.3
#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 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; } // 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("%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 double average(int x[],int n) { int i; double s=0; for(i=0;i<=n;i++) { s=s+x[i]; } return (s/n); } // 对整型数组x中的n个元素降序排序 void sort(int x[], int n) { int i,j,t; for(j=1;j<=n-1;j++) { for(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; } } } }
task.4
#include<stdio.h> void dec2n(int x, int n); // 函数声明 int main() { int x; printf("输入一个十进制整数: "); scanf("%d", &x); 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 return 0; } // 函数定义 // 功能: 把十进制数x转换成n进制,打印输出 void dec2n(int x, int n) { int a[80]; int i,j; for(i=0;i<=80;i++) { if(x/n!=0) { a[i]=x%n; x=x/n; } else { a[i]=x; break; } } for(j=i;j>=0;j--) { if(n==16&&a[j]>=10) { switch(a[j]%10) { case 0: printf("A");break; case 1: printf("B");break; case 2: printf("C");break; case 3: printf("D");break; case 4: printf("E");break; case 5: printf("F");break; } } else printf("%d",a[j]); } printf("\n"); }
task.5
#include<stdio.h> #define N 20 int main() { int a[N][N]; int n; int i, j, k; printf("Enter n: "); while(scanf("%d",&n)!=EOF) { for (i = 0; i < n; i++) for (j = 0; j < n; j++) if(i<j) a[i][j]=i+1; else a[i][j]=j+1; for (i = 0; i < n; i++) { for (j = 0; j < n; j++) printf("%d ", a[i][j]); printf("\n"); } printf("\nEnter n: "); } return 0; }
task.6
#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 temp; int i = 0; printf("original views:\n"); printf("views1: %s\n",views1); printf("views2: %s\n",views2); while(views1[i]!='\0') { temp = views1[i]; views1[i] = views2[i]; views2[i] = temp; i++; } printf("\nswapping...\n"); printf("views1: %s\n",views1); printf("views2: %s\n",views2); return 0; }
task.7
#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) { int i,j; char temp[M]; for(j=0;j<n;j++) { for(i=0;i<n-1;i++) { if(strcmp(str[i],str[i+1])>0) { strcpy(temp,str[i]); strcpy(str[i],str[i+1]); strcpy(str[i+1],temp); } } } }