实验三

#include<stdio.h>
int func(int n,int m);
int main()
{
    int n,m;
    while(scanf("%d%d",&n,&m)!= EOF)
    printf("n=%d,m=%d,ans=%d\n",n,m,func(n,m));
    return 0;
 } 
 int func(int n,int m){
     if(n<m)
     return 0;
     if(m==0||n==m)
     return 1;
     return func(n-1,m-1)+func(n-1,m);
 }

#include<stdio.h>
#include<stdlib.h>
int hanoi(int n,char x,char y,char z,int*counter)
{
    int move(char,int,char);
    if(n==1)
    {
        move(x,1,z);
        (*counter)++;
    }
    else
    {
        hanoi(n-1,x,z,y,counter);
        move(x,n,z);
        (*counter)++;
        hanoi(n-1,y,x,z,counter);
    }
    return 0;
}
int move(char get,int n,char put)
{
    static int k=1;
    printf("%d:%c-->%c\n",n,get,put);
    k++;
    return 0;
}
int main()
{
    system("color CF");
    int hanoi(int,char,char,char,int*);
    int n,counter;
    while(scanf("%d",&n)!=EOF)
    {
        counter=0;
        hanoi(n,'A','B','C',&counter);
        printf("\n一共移动了%d次\n\n",counter);
    }
    return 0;
    
    }

#include<stdio.h>
#include<math.h>
long func(long s);
int main(){
    long s,t;
    printf("Enter a number:");
    while(scanf("%ld",&s) !=EOF){
        t=func(s);
        printf("new number is:%ld\n\n",t);
        printf("Enter a number");
    }
    return 0;
}
long func(long s){
    long result=0;
    long multiplier=1;
    while(s>0){
        long digit=s%10;
        if(digit%2!=0){
            result=result+digit*multiplier;
            multiplier*=10;
        }
        s/=10;
    }
    return result;
}