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sprintf()导致RE

Posted by 350053879 at 2008-03-25 19:24:44 on Problem 1002 
请问系统是不是不能使用sprintf()函数:
void print(int x,int cal)
{
	char *res;
	sprintf(res,"%03d",x/10000);
	cout<<res<<"-";
	sprintf(res,"%04d",x%10000);
	cout<<res<<" "<<cal<<endl;
}
这段代码导致RE,WHy
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