C语言练习2

25.

#include <stdio.h>
int main ()
{
        int n;
        scanf("%d",&n);
                if(n>=0)
                {
                if(n>0)
                        {
                        printf("sign(%d) = 1\n",n);
                        else printf("sign(%d) = 0\n",n);
                        }
                }
                        else printf("sign(%d) = -1\n",n);
                return 0;
}

26.

#include<stdio.h>
int main()
{
    int arr[3];
    scanf("%d %d %d",&arr[0],&arr[1],&arr[2]);
    int i;
    int index;
    int temp;
    int j;
    for(i=0;i<2;i++)
    {
        index=i;
        temp=arr[i];
        for(j=i+1;j<3;j++)
        {
           if(arr[j]<=arr[index]) index=j;
        }
        arr[i]=arr[index];
        arr[index]=temp;
    }
    printf("%d->%d->%d\n",arr[0],arr[1],arr[2]);
    return 0;
}

27.

#include<stdio.h>
int main()
{
    int m;
    int n; 
    scanf("%d %d",&m,&n);
    int t1=n+n*0.1;
    int t2=n+n*0.5;
    printf("%d %d\n",t1,t2);
    if(m<t1) printf("OK\n");
    if(m>=t1&&m<t2)
    {
        double temp1=(m-n)/(double)n*100.0;
        double temp2=temp1-(int)temp1;
        int temp;
        if(temp2>=0.5) temp=(int)temp1+1;
        else temp=(int)temp1;
        printf("Exceed %d%%. Ticket 200\n",temp);
    }
    if(m>=t2)
    {
        double temp1=(m-n)/(double)n*100.0;
        double temp2=temp1-(int)temp1;
        int temp;
        if(temp2>=0.5) temp=(int)temp1+1;
        else temp=(int)temp1;
        printf("Exceed %d%%. License Revoked\n",temp);
    }
return 0;
}

28