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(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,j;
j=0;
for(i=101;i<=200;i++)
{
if(isprime(i)){ 
printf("%4d",i),j++;
if(j%5==0)
printf("\n");} 
}
printf("\n");
printf("100~200之间有%d个素数",j);
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>
#include<math.h>
int main()
{
 printf("Enter a number :");
int n,m,j,i;
j=0,i=1;
scanf("%d",&n);
while (n!=0) 
{ 
    m=n%10,n=n/10;
     if(m%2!=0){
     

     j=m*i+j; i=i*10;
    }
}
printf("new number is:%ld\n",j);
return 0;
}