今天晚上我一直在玩下面的代碼幾個小時,我只是用它抓撓我的腦袋。無效的讀取大小8,無效的寫入大小8(Valgrind)
當使用函數從標準輸入填充數組時,我總是收到「無效的8號大小寫」和「大小8的無效讀取」。
任何幫助將不勝感激......我知道堆棧溢出有很多這些錯誤,但其中大多數是唯一的情況。
void RawScore(unsigned int rawScoreCount, unsigned int numStudents, student studentInfo[],
unsigned int projectCount, double rawScores[], double scores[], double weights[])
{
int id;
for (int i = 0; i < rawScoreCount; i++)
{
std::cin >> id;
for (int j = 0; j < numStudents; j++)
{
if (id == studentInfo[j].id)
{
for (int k = 0; k < projectCount; k++)
{
std::cin >> rawScores[k];
studentInfo[j].score += rawScores[k]/scores[k] * weights[k];
}
}
}
std::cin.ignore(10000, '\n');
}
}
從MEMCHECK下面的錯誤是:
==5793== Memcheck, a memory error detector
==5793== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==5793== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for copyright info
==5793== Command: a.out.app
==5793==
==5793== Invalid write of size 8
==5793== at 0x40E54DB: std::__1::istreambuf_iterator<char, std::__1::char_traits<char> > std::__1::num_get<char, std::__1::istreambuf_iterator<char, std::__1::char_traits<char> > >::__do_get_floating_point<double>(std::__1::istreambuf_iterator<char, std::__1::char_traits<char> >, std::__1::istreambuf_iterator<char, std::__1::char_traits<char> >, std::__1::ios_base&, unsigned int&, double&) const (in /usr/lib/i386-linux-gnu/libc++.so.1.0)
==5793== by 0x40E517E: std::__1::num_get<char, std::__1::istreambuf_iterator<char, std::__1::char_traits<char> > >::do_get(std::__1::istreambuf_iterator<char, std::__1::char_traits<char> >, std::__1::istreambuf_iterator<char, std::__1::char_traits<char> >, std::__1::ios_base&, unsigned int&, double&) const (in /usr/lib/i386-linux-gnu/libc++.so.1.0)
==5793== by 0x804D0FA: std::__1::basic_istream<char, std::__1::char_traits<char> >::operator>>(double&) (locale:771)
==5793== by 0x804CECC: RawScore(unsigned int, unsigned int, student*, unsigned int, double*, double*, double*) (input.cpp:44)
==5793== by 0x804EE6A: main (main.cpp:35)
==5793== Address 0x445c388 is 0 bytes after a block of size 40 alloc'd
==5793== at 0x402A17C: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==5793== by 0x40BA709: operator new(unsigned int) (in /usr/lib/i386-linux-gnu/libc++.so.1.0)
==5793== by 0x804EE26: main (main.cpp:32)
==5793==
==5793== Invalid read of size 8
==5793== at 0x804CED3: RawScore(unsigned int, unsigned int, student*, unsigned int, double*, double*, double*) (input.cpp:49)
==5793== by 0x804EE6A: main (main.cpp:35)
==5793== Address 0x445c388 is 0 bytes after a block of size 40 alloc'd
==5793== at 0x402A17C: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==5793== by 0x40BA709: operator new(unsigned int) (in /usr/lib/i386-linux-gnu/libc++.so.1.0)
==5793== by 0x804EE26: main (main.cpp:32)
==5793==
....... output of program here ......
==5793==
==5793== HEAP SUMMARY:
==5793== in use at exit: 0 bytes in 0 blocks
==5793== total heap usage: 9 allocs, 9 frees, 476 bytes allocated
==5793==
==5793== All heap blocks were freed -- no leaks are possible
==5793==
==5793== For counts of detected and suppressed errors, rerun with: -v
==5793== ERROR SUMMARY: 20 errors from 2 contexts (suppressed: 0 from 0)
我已經縮小的問題,下面兩行,在讀10個錯誤的寫入和10:
std::cin >> rawScores[k];
studentInfo[j].score += rawScores[k]/scores[k] * weights[k];
任何有識之士將不勝感激!
PLZ提供main(),輸入參數或兩者,如果可能的話。 – 2014-11-08 05:18:23