实验 3

#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 n,i;
    n=0;
    for(i=101;i<=200;i++)
    {
        if(isprime(i))
        {
            printf("%d  ",i);
        
            n++;
            if(n%5==0)
            printf("\n");
        }
    }
    printf("\n");
    printf("101~200之间共有%d个素数",n);
    
    return 0;
}

int isprime(int n)
{
    int k;
    for(k=2;k<=sqrt((double)n);k++)
        if(n%k==0)
        return 0;
    return 1;
}

#include<stdio.h>
#include<math.h>
int main()
{
    long int number;
    int i,n,s;
    s=0,n=0;
    
    printf("Enter a number : ");
    scanf("%ld",&number);
    
    for(;number!=0;)
    {
        i=number%10;
        number=number/10; 
        
        if (i%2!=0) 
        {
            n++;
            s+=pow(10,n)*i;
        }    
           
    }    
    printf("new number is : %ld",s/10);
    
    return 0;
 }