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> 
#include<math.h>
int prime(unsigned int);
int main()
{unsigned int m,n;
n=101;m=0;
do{
if(prime(n)!=0)
{
printf("%u\n",n);
m++;}
n+=1;


}
while(n<=200);
printf("101~200之间共有%u\n个素数",m);
return 0;

}
int prime(unsigned int x)
{int i,k;
k=sqrt(x);
for(i=2;i<=k;i++)
{if(x%i==0)
return 0;
else if(i>k)
return 1;
}
}

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

 } 

#include<stdio.h> 
int main()
{int n,a,i,b;
float m=0,s=0;
b=1;

printf("Enter a and n:");
scanf("%d%d",&a,&n);
for(i=1;i<=n;i++)
{m=m+a*b;
s=s+(float)i/m;
b=b*10;

}
printf("s=%f",s);
return 0;

}