一元n次方程

    先讨论0的时候，再讨论1的时候以及在首和尾的时候，最后正常情况，我用的是“符号+数字”来排的。

#include<stdio.h>

#include<math.h> 

int main()

{

         int n,a[1000];

         int i;

         scanf("%d",&n);

         for(i=0;i<n;i++)   //输入系数//

         {

                  scanf("%d",&a[i]);  

         }

         for(i=0;i<n;i++)

         {

                 if(a[i]==0)     //判断是否为0，为0则跳过//

                 {

                          continue;   

                 }

                 else if(fabs(a[i])==1)  //讨论系数为1的时候//

                 {

                         if(a[i]<0)      //为负数时//

                         {

                                  printf("-");

                         }

                         else if(a[i]>0&&i!=0)   //为正数时且不为首位的时候前面加个"+"//

                         {

                                  printf("+");

                         }

                         if(i==n-1)  //末尾时//

                         {

                                  printf("x");

                         }

                         else        //中间状态//   

                         {

                                  printf("x^%d",n-i);

                         }

                  }

                 else 

                 {

                          f(a[i]>0&&i!=0)      //中间状态//

                          {

                                  printf("+");

                          }

                          if(i==n-1)     //同样末尾时//

                          {

                                  printf("%dx",a[i]);

                          }

                          else 

                          {

                                  printf("%dx^%d",a[i],n-i);

                          }

                 }

         }

         return 0;

}