实验四
#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"); 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.不是,4个; 2.是,1个; 3.一样,一样。
#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; }
1.是,4个;2.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是这一年中的第%d天.\n\n", year, month, day, days); } return 0; } int days_of_year(int year, int month, int day) { int n=0,i; int x[13]={0,31,28,31,30,31,30,31,31,30,31,30,31 }; if ((year%4==0&&year%100!=0)||(year%400==0)) x[2]=29; for (i=1;i<month;i++) n=n+x[i]; return n+day; }
#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) { double s=0; for(int i=0;i<n;i++) s+=x[i]; return(s/n); } void sort(int x[], int n) { int m; for(int i=0;i<n;i++) { for(int j=i+1;j<n;j++) { if(x[j]>x[i]) { m=x[i]; x[i]=x[j]; x[j]=m; } } } }
#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; } void dec2n(int x,int n) { int a[100]; int i,k,j=0; while(x!=0) { i=x%n; a[j++]=i; x=x/n; } for(k=j-1;k>=0;k--) { if(a[k]>9&&a[k]<16) printf("%c",a[k]-10+'A'); else printf("%d",a[k]); } printf("\n"); }
#include <stdio.h> int main (void) { int n,i,j; while( printf("Enter n:"),scanf("%d",&n)!=EOF) { int a[n][n]; for (i=0;i<n;i++) { for (j=i;j<n;j++) { a[i][j]=i+1; } } for (j=0;j<n;j++) { for (i=j;i<n;i++) { 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("\n"); } return 0; }
#include <stdio.h> #define N 80 int main() {int i; char views1[N] = "hey, c, i hate u."; char views2[N] = "hey, c, i love u."; printf("original views:\n"); printf("views1:"); puts(views1); printf("views2:"); puts(views2); printf("\n"); char t; for(i=0;views1[i]!='\0';i++) { t=views1[i]; views1[i]=views2[i]; views2[i]=t; } printf("swaping......"); printf("\n"); printf("views1:"); puts(views1); printf("views2:"); printf(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 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); } }}}