ideone不显示任何输出

Question

this code is of problem http://www.spoj.com/problems/BASE/ and it runs fine on windows and linux but when i run it on ideone it does not show me any output. Can anyone tell me what is the reason behind this?

#include<stdio.h>
#include<math.h>
#include<string.h>
#include<string>
#include<iostream>

using namespace std;

long int convert_base10(char *num, int base)
{
int len, dig;
long int result = 0;
len = strlen(num);
//    printf("len = %d\n", len);
// converting to base 10
for(int i=0; i<len; i++)
{
    if((num[len-i-1] >= 'A') && (num[len-i-1] <= 'F'))
        dig = num[len-i-1] - 55;
    else
        dig = num[len-i-1] - 48;
    result +=  (dig * pow(base, i));
  //        printf("num[%d] = %d\n", len-i-1, dig);
}
return result;
}

void convert_basei(long int num, int base, string &result1)
{
bool error = false;
int pos = 6;
char result[7], rem;
// initially storing space on all position
for(int i=0; i<7; i++)
    result[i] = ' ';
while(num)
{
    if((num % base) >= 10)
        rem = (num % base) + 55;
    else
        rem = (num % base) + 48;
    result[pos] = rem;//printf("result[%d] = %c\n", pos, rem);
    num /= base;//    printf("quotient = %d\n", num);
    pos--;
    if(pos < 0 && num > 0)
    {
        error = true;
        break;
    }

}
if(error == true)
   result1 = "  ERROR";
else
    result1 = result;
//    cout<<"result = "<<result1<<endl;
}

int main()
{
char num[7];
string result;
int base1, base2;
while(scanf("%s%d%d", num, &base1, &base2) == 3)
{
//        printf("num = %s\nbase1 = %d\nbase2 = %d\n", num, base1, base2);
    long int temp = convert_base10(num, base1);
//        printf("temp = %ld\n", temp);
    convert_basei(temp, base2, result);
    cout<<result<<endl;
}
return 0;
}

Answer 1

Replace this code:

while(scanf("%s%d%d", num, &base1, &base2) == 3)
{
    long int temp = convert_base10(num, base1);
    convert_basei(temp, base2, result);
    cout<<result<<endl;
}

With this code, and the mystery will go away:

printf("trying to get input\n");
while(scanf("%s%d%d", num, &base1, &base2) == 3)
{
    printf("got some input\n");
    long int temp = convert_base10(num, base1);
    convert_basei(temp, base2, result);
    cout<<result<<endl;
}
printf("got no input\n");

Answer 2

I suspect a bug at ideone.com .

I cloned your source and input, with a couple of minor adjustments and see no output at all. Since I expected to see some output, I've filed a report using the "report bug / make suggestion" link on the page.

Then I cloned it again, made a few more stylistic changes and it gives the desired results.

---

Response from Ideone

Date: Fri, 8 Mar 2013 12:18:49 +0100
From: Filip Wielewski <wiele@s...>
To: paj-ideone@j...
Cc: contact@i...
Subject: Re: Please see this question on StackOverflow for an explanation...

Hi [Johnsyweb],

thank you for letting us know about this issue. There is indeed
some problem with the original source code posted by Vijay Jain.
We will examine it and try to fix it very soon.

Regards,
Filip Wielewski
Ideone Team

2013/2/16 Ideone bug/suggestion <noreply@i...>

    Ideone bug/suggestion

    category: compiler/interpreter
    type: bug
    date: 2013-02-16 08:38:16
    user: johnsyweb
    e-mail: paj-ideone@j...
    site: http://ideone.com/Q8Kv9m
    compiler: C++ (ver: gcc-4.7.2, id: 1)
    description: Please see this question on StackOverflow for
    an explanation: http://stackoverflow.com/q/14907730/78845

    My response:
    http://stackoverflow.com/a/14908061/78845

    Regards;


    --paj