实验三
task1
#include<stdio.h> #include<stdlib.h> #include<time.h> #include<windows.h> #define N 80 void printText(int line,int col, char text[]); void printSpaces(int n); void printBlanklines(int n); int main() { int line, col, i; char text[N]= "hi,May~"; srand(time(0)); for(i=1;i<=10;++i) { line = rand()%25; col = rand()%80; printText(line,col,text); Sleep(1000); } return 0; } void printSpaces(int n) { int i; for(i=1;i<=n;i++) printf(" "); } void printBlanklines(int n) { int i; for(i=1;i<=n;i++) printf("\n"); } void printText(int line,int col,char text[]) { printBlanklines(line-1); printSpaces(col-1); printf("%s",text); }
间隔一秒钟打印文本“hi,May”
task2
#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!=%11d\n",i,fac(i)); return 0; } long long fac(int n) { static long long p=1; p=p*n; printf("p=%11d\n",p); return p; }
task2-2
#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; }
局部在static变量声明处初始化,之后将变量运算的所得值,代替原来变量所被赋予的值进行下一步运算
task3
#include<stdio.h> long long fun(int n); int main() { int n; long long f; while(scanf("%d",&n)!=EOF) { f=fun(n); printf("n=%d,f=%11d\n",n,f); } return 0; } long long fun(int n) { long long k; if(n==0) return 0; else k=2*fun(n-1)+1; return k; }
task4
#include<stdio.h> void hanoi(unsigned int n,char from,char temp,char to); void moveplate(unsigned int ,char from,char to); long long fun(int n); int main() { unsigned int n; while(scanf("%u",&n)!=EOF) { hanoi(n,'A','B','C'); printf("一共移动了%d次\n",fun(n)); } return 0; } void hanoi(unsigned int 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 int n,char from,char to) { printf("第%u个盘子:%c-->%c\n",n,from,to); } long long fun(int n) { long long k; if(n==0) return 0; else k=2*fun(n-1)+1; return k; }
task5
#include<stdio.h> #include<math.h> #include<stdlib.h> int is_prime(int n); int main() { int i,p; for(i=4;i<=20;i+=2) { for(p=2;p<=i/2;p++) if(is_prime(p)==1&&is_prime(i-p)==1) printf("%d=%d+%d\n",i,p,(i-p)); } return 0; } int is_prime(int n) { int i; for(i=2;i<=sqrt(n);i++) if(n%i==0) break; if(i>sqrt(n)&&n>1) return 1; else return 0; }
task6
#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[100],i=0,j,k; while(s!=0) { a[i]=s%10; s/=10; i++; } for(j=0;j<=i;j++) { if(a[i-j-1]%2==1) k=k*10+a[i-j-1]; } return k; }