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_s("%d", &number);
    max = number;
    min = number;
    
    while(n<=4) {
        n=n+1;
        printf("输入第%d个数: ", n);
        scanf_s("%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("%5d", i);
            n=n+1;
            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(n); k++)
        if (n % k == 0)
            return 0;
    return 1;
}

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