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<=4)
    {
        n++;
        printf("输入第d%个数: ", n);
        scanf("%d", &number);    

        if(max<number)
            max = number;
        else if(min>number)
            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 main()
{
    int i=0;
    int count=0;
    for(i=101;i<=200;i+=2)
    {
        int j=0;
        for(j=2;j<=sqrt(i);j++)
        {
            if(i%j==0)
            {
                break;
            }
        }
        if(j>sqrt(i))
        {
            printf("%d\n",i);
            count++;
        }
    }
    printf("\ncount=%d\n",count);
    return 0;
}

#include<stdio.h> 
#include<math.h>
int main()
{
    printf("Enter a number:");
    int k,i=1;
    unsigned long m,a=0;
    scanf("%lu",&m);
    while(m!=0)
    {
        k=m%10;
        m=m/10;
        if(k%2==1)
        {
            a=a+k*i;
            i=10*i;
        }
    }
     printf("new number is:%lu",a);
    return 0;
}