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>
int main()
{
    int n=0;
    int i=0;
    for(i=100;i<=200;i++)
    {
    int a=0;
    for(a=2;a<i;a++)
    {
    if(i%a==0)
    break; 
    }
    if(a==i)
    {
        n++;
        printf("%d\n",i);
    }
}
printf("\n");
printf("素数的个数为：%d\n",n);
return 0;
}

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