实验四
实验4task1-1
#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; }
int型数组a在内存中是连续存放,每个元素占用4个内存字节单元
char型数组b在内存中是连续存放,每个元素占用1个内存字节单元
一样
#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; 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; }
int型二维数组a在内存中是按行连续存放,每个元素占用4个内存字节单元
char型二维数组b在内存中是按行连续存放的,每个元素占用1个内存字节单元
#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("%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 a,i; int b[N]={0,31,28,31,30,31,30,31,31,30,31,30,31}; int days,ans=0; if(month==1) { days=day; } for(i=1;i<month;i++) { ans=ans+b[i]; if(((year%4==0)&&(year%100!=0))||(year%400==0)) { days=ans+day+1; } else { days=ans+day; } } return days; }
#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("%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 sum=0; int i; double ave; for(i=0;i<n;i++) { sum=sum+x[i]; } ave=(double)sum/n; return ave; } void bubble_sort(int x[],int n) { int i,j,t; printf("\n"); for(j=0;j<n;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; } }
#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("%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=0,j,k,p,a[100],b[100]; char arr[20] if(n==2||n==8) { do{ a[i]=x%n; x=x/n; i++; j++; }while(x!=0); for(j=i-1;j>=0;j--) printf("%d",a[j]); printf("\n"); } if(n==16) { if(x==0) printf("0"); while(x!=0) { b[++k]=arr[x%16]; x=x/16; } for(p=k;p>0;p--) printf("%c",b[p]); } }
#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 i, j, n; printf("Enter n: "); while(scanf("%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=0;j<n;j++) if(i<=j) x[i][j]=i+1; else 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); 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]); 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; } void bubble_sort(char str[][M],int n) { int i,j,t[100]; int b[100]; printf("\n"); for(j=0;j<n;j++) for(i=0;i<n-j-1;i++) if(strcmp(str[i],str[i+1])>0) { strcpy(t,str[i]); strcpy(str[i],str[i+1]); strcpy(str[i+1],t); } }