实验三
task 1
//每隔一秒出现一次hi,May~ 共10次
#include<stdio.h> #include<stdlib.h> #include<time.h> #include<windows.h> #define N 80 void printText(int line,int co1,char text[]); //函数声明 void printspaces(int n); //函数声明 void printBlinkLines(int n); //函数声明 int main() { int line,co1,i; char text[N] = "hi,May~"; srand(time(0)); //以当前系统时间作为随机种子 for(i=1;i<=10;++i) { line=rand()%25; co1=rand()%80; printText(line,co1,text); Sleep(1000); //暂停1000ms } return 0; } //打印n个空格 void printSpaces(int n) { int i; for(i=1;i<=n;++i) printf(" "); } //打印n行空白行 void printBlankLines(int n) { int i; for(i=1;i<=n;++i) printf("\n"); } //在第line行第co1列打印一段文本 void printText(int line,int co1,char text[]) { printBlankLines(line-1); //打印n-1行空行 printSpaces(co1-1); //打印n-1列空格 printf("%s",text); }
task2
2.1
#include <stdio.h> long long fac(int n); int main() { int i, n; printf("Enter n: "); scanf("%d", &n); for (i = 1; i <= n; ++i) printf("%d! = %lld\n", i, fac(i)); return 0; } long long fac(int n) { static long long p = 1; printf("p=%lld\n",p); p = p * n; return p; }
#include <stdio.h> long long fac(int n); int main() { int i, n; printf("Enter n: "); scanf("%d", &n); for (i = 1; i <= n; ++i) printf("%d! = %lld\n", i, fac(i)); return 0; } long long fac(int n) { static long long p = 1; printf("p = %lld\n", p); p = p * n; return p; }
结果一致
2.2
#include <stdio.h> int func(int, int); int main() { int k = 4, m = 1, p1, p2; p1 = func(k, m); p2 = func(k, m); printf("%d,%d\n", p1, p2); return 0; } int func(int a, int b) { static int m = 0, i = 2; i += m + 1; m = i + a + b; return m; }
task3
#include <stdio.h> long long fun(int n); int main() { int n; long long f; while (scanf("%d", &n) != 0) { f = fun(n); printf("n = %d, f = %lld\n", n, f); } return 0; } long long fun(int n) { int s; if (n > 1) s = 2 * fun(n - 1) +1; else if (n == 1) s = 1; return s; }
task4
#include <stdio.h> int h(int m); void hanoi(unsigned n, char from, char temp, char to); void moveplate(unsigned n, char from ,char to); int main() { unsigned n; int s; while(scanf("%u", &n) != EOF) { hanoi(n, 'A', 'B', 'C'); printf("一共移动盘子的次数:%ld",h(n)); } 0; } void hanoi(unsigned n, char from, char temp, char to) { if(n==1) moveplate(n, from, to); else { hanoi(n-1, from , to, temp); moveplate(n, from, to); hanoi(n-1, temp, from, to); } } void moveplate(unsigned n, char from, char to) { printf("第%u个盘子: %c --> %c\n", n, from, to); } int h(int m) { int s; if(m==1) s=1; else s=2*h(m-1)+1; return s; }
task5
#include<stdio.h> #include<math.h> int is_prime(int a); int main() { int n, i; for (n = 4; n <= 20; n += 2) { for (i = 2; i <= n ; i++) { if (is_prime(i) && is_prime(n - i)) { printf("%d=%d+%d\n", n, i, n - i); break; } } } return 0; } int is_prime(int a) { if (a == 2) return 1; else { int i = 0; for (i = 2; i <= sqrt(a); i++) { if (a % i == 0) return 0; } } return 1; }
task 6
#include<stdio.h> long fun(long s); int main() { long s,t; printf("Enter a number: "); while(scanf("%ld",&s) !=EOF) { t=fun(s); printf("new number is : %ld\n\n",t); printf("Enter a number: "); } return 0; } long fun(long s) { int a,b,c,d; b=0;d=0; while(s) { a=s%10; s/=10; if(a%2) {b=b*10+a;} } while(b) { c=b%10; b/=10; d=d*10+c; } return d; }