计算指数的最后多少位.cpp

一些c++小程序

#include<iostream.h>
const  int maxsize=10000;
void  add(int ch[],int &flag,int size,int x)
{
	int c=0;
	flag=flag<=size ? flag:size;
	 for(int i=0;i<flag;i++)
	 {
		 int bak=ch[i]*x+c;
		  ch[i]=bak%10;
		   c=bak/10;
	 }
	 if(c>0)
	 { 
            ch[flag]=c;
             flag++;
     }
}	
void main()
{
	int *ch=new int[maxsize+1];
	 int x,y,flag=1,size=maxsize;
	  cout<<"请输入底数:"<<endl;
	   cin>>x;
	    while(!(x>0&&x<10))
		{
			cout<<"输入错误,请重新输入!"<<endl;
			 cin>>x;
		}
		cout<<"请输入指数:"<<endl;
	   	 cin>>y;
  		   while(y<0)
		   {
		    cout<<"输入有错误!重新输入!"<<endl;
			 cin>>y;
		   }
		   for(int i=0;i<maxsize;i++)
			   ch[i]=0;
		   ch[0]=1;
		    for(i=0;i<y;i++)
				add(ch,flag,size,x);if(flag>maxsize) flag=maxsize;
			      if(flag==maxsize)
                      cout<<"最后"<<flag<<"位是:"<<endl;
                           else
                               cout<<"结果一共有:"<<flag<<"位:"<<endl;
				    for(i=flag-1;i>=0;i--)
						cout<<ch[i];
					      cout<<endl;
						  delete []ch;
}