本文介绍了获取错误浮点异常:8的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我不知道为什么g ++不喜欢我的代码。它在java中运行良好。非常感谢任何见解。
I have no idea why g++ doesn't like my code. It ran fine in java. Any insights would be greatly appreciated.
#include<iostream>
using namespace std;
bool isPrime(long number);
int main(){
const long number = 600851475143;
long max = 0;
for(long i= 0; i*i <= number; i++)
if(number % i == 0 && isPrime(i))
max = i;
cout<< max << endl;
return 0;
}
bool isPrime(long number){
if(number <= 1) return false;
if(number == 2) return true;
if(number % 2 == 0) return false;
for(long i= 3; i*i <= number; i+=2)
if(number % i == 0)
return false;
return true;
}
推荐答案
const long number = 600851475143;
有溢出,长不能持有大数字。
There is overflow, long can't hold that big number.
请参阅
LONG_MAX is 2147483647
try:
const unsigned long long number = 600851475143;
unsigned long longmax = 0;
编辑:
%对0, i
从 0开始
for(long i= 0; i*i <= number; i++)
^^
{
if(number % i == 0 && isPrime(i))
^^^
{
max = i;
cout<< max << endl;
}
}
轻微更改为正常版本:
bool isPrime(unsigned long long number);
int main(){
const unsigned long long number = 600851475143;
unsigned long long max = 0;
for(long i = 1; i*i <= number; i++)
{
if(number % i == 0 && isPrime(i))
{
max = i;
cout<< max << endl;
}
}
return 0;
}
bool isPrime(unsigned long long number)
{
if(number <= 1) return false;
if(number == 2) return true;
if(number % 2 == 0) return false;
for(unsigned long long i= 3; i*i <= number; i+=2)
{
if(number % i == 0)
{
return false;
}
}
return true;
}
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