实验三

#include <stdio.h>
#include <stdlib.h>
int main() {
    int number, max, min, n;
    
    n=1;
    printf("输入第%d个数: ", n);
    scanf("%d", &number);
    max = number;
    min = number;
    
    while(n<5) {
        n++;
        printf("输入第%d个数: ", n);
        scanf("%d", &number);    

        if(number>max)
            max = number;
        else if(number<min)
            min = number;
    }
    
    printf("最大数为: %d\n", max);
    printf("最小数为: %d\n", min);
    
    system("pause");
    
    return 0;
} 

#include<stdio.h>
#include<math.h>
int isprime(int n);
int main()
{
    int i,n=0;
    for(i=101;i<=200;i++)
    {
        if(isprime(i))
        {
            printf("%4d",i);
            n++;    
        }    
    }
    printf("101到200间有%d个素数\n",n);
    return 0;
 }
 int isprime(int n)
 {
     int k;
     for(k=2;k<=sqrt(n);k++)
         if(n%k==0) 
                return 0;
            return 1;
  } 

#include<stdio.h>
int main()
{
    long int n;
    int a,b,c;
    a=0,b=1;
    printf("Enter a number："); 
    scanf("%ld",&n);
    while(n)
    {
        c=n%10;
        if(c%2!=0)
        {
            a=a+c*b;
            b=b*10; 
         }
         n=n/10; 
    }
    printf("New number is:%ld\n",a);
    return 0;
}

#include<stdio.h>
int main()
{
    long long int n;
    int a,b,c;
    a=0,b=1;
    printf("Enter a number："); 
    scanf("%ld",&n);
    while(n)
    {
        c=n%10;
        if(c%2!=0)
        {
            a=a+c*b;
            b=b*10; 
         }
         n=n/10; 
    }
    printf("New number is:%ld\n",a);
    return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int n, a;
    printf("Enter n and a:\n");
    scanf("%d %d", &n, &a);
    int m = 0;
    double s = 0;
    for(int i = 1;i<=n;i++)
    {
        m=m*10+a;
        s=s+(double)i/(double)m;
    }
    printf("s=%lf",s);
    system("pause");
    return 0;
}