实验四
实验一
#include <stdio.h> #define N 4 #include <stdlib.h> 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); system("pause"); return 0; }
1,是连续存放,4个字节
2,是连续存放,1个字节
3,都一样
#include <stdio.h> #include <stdlib.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]); system("pause"); return 0; }
1,是,4个字节
2,是,1个字节
实验二
#include <stdio.h> #include <stdlib.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); } system("pause"); return 0; } int days_of_year(int year, int month, int day) { int i,s=0; if(year%4==0) { int a[12]={31,29,31,30,31,30,31,31,30,31,30,31}; for(i=0;i<month-1;i++) { s+=a[i]; } s=s+day; }else{ int a[12]={31,28,31,30,31,30,31,31,30,31,30,31}; for(i=0;i<month-1;i++) { s+=a[i]; } s=s+day; } return s; }
实验三
#include <stdio.h> #include <stdlib.h> #include<string.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); system("pause"); 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"); } double average(int x[], int n) { double s=0; int i; for(i=0;i<n;i++) { s+=x[i]; } return s/n; } 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; } } }
实验四
#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("%d", &x) != EOF) { 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 printf("\n输入一个十进制整数: "); } return 0; } void dec2n(int x, int n) { int c[100]; char a[16]={'0','1','2','3','4','5','6','7','8','9','A','B','D','E','F'}; int i=0,j; switch (n) { case 2: while(x!=0) { c[i++]=x%2; x/=2; } for(j=i-1;j>=0;j--) printf("%d",c[j]); printf("\n"); break; case 8: while(x!=0) { c[i++]=x%8; x/=8; } for(j=i-1;j>=0;j--) printf("%d",c[j]); printf("\n"); break; case 16: while(x!=0) { c[i++]=x%16; x/=16; } for(j=i-1;j>=0;j--) printf("%c",a[c[j]]); printf("\n"); } }
实验五
#include <stdio.h> #define N 100 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("%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"); } } void func(int x[][N], int n) { int i,j; for(i=n-1;i>=0;i--) for(j=n-1;j>=0;j--) { x[i][j]=i+1; x[j][i]=i+1; } }
实验六
#include <stdio.h> #include <stdlib.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); system ("pause"); return 0; }
#include <stdio.h> #include <string.h> #include <stdlib.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]); system("pause"); return 0; }
实验七
#include <stdio.h> #include <string.h> #include <stdlib.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]); system("pause"); return 0; } void bubble_sort(char str[][M], int n) { int i,j; char x[100]; for(i=0;i<=n-1;i++) for(j=0;j<n-1-i;j++) if(strcmp(str[j],str[j+1])>0) { strcpy(x,str[j]); strcpy(str[j],str[j+1]); strcpy(str[j+1],x); } }