我有一个代码需要从 C 语言“翻译”到 Cpp,但我无法理解,哪里出了问题。有一个部分,它崩溃了(windows 严重错误发送/不发送):
nDim = sizeMax*(sizeMax+1)/2;
printf("nDim = %d sizeMax = %d\n",nDim,sizeMax);
hamilt = (double*)malloc(nDim*sizeof(double));
printf("End hamilt alloc. %d allocated\n",(nDim*sizeof(double)));
transProb = (double*)malloc(sizeMax*sizeMax*sizeof(double));
printf("End transProb alloc. %d allocated\n",(sizeMax*sizeMax*sizeof(double)));
eValues = (double*)malloc(sizeMax*sizeof(double));
printf("eValues allocated. %d allocated\n",(sizeMax*sizeof(double)));
eVectors = (double**)malloc(sizeMax*sizeof(double*));
printf("eVectors allocated. %d allocated\n",(sizeMax*sizeof(double*)));
if(eVectors) for(i=0;i<sizeMax;i++) {
eVectors[i] = (double*)malloc(sizeMax*sizeof(double));
printf("eVectors %d-th element allocated. %d allocated\n",i,(sizeMax*sizeof(double)));
}
eValuesPrev = (double*)malloc(sizeMax*sizeof(double));
printf("eValuesPrev allocated. %d allocated\n",(sizeMax*sizeof(double)));
eVectorsPrev = (double**)malloc(sizeMax*sizeof(double*));
printf("eVectorsPrev allocated. %d allocated\n",(sizeMax*sizeof(double*)));
if(eVectorsPrev) for(i=0;i<sizeMax;i++) {
eVectorsPrev[i] = (double*)malloc(sizeMax*sizeof(double));
printf("eVectorsPrev %d-th element allocated. %d allocated\n",i,(sizeMax*sizeof(double)));
}
日志:
nDim = 2485 sizeMax = 70
End hamilt alloc. 19880 allocated
End transProb alloc. 39200 allocated
eValues allocated. 560 allocated
eVectors allocated. 280 allocated
所以它在分配循环开始时崩溃了。如果我删除这个循环,它会在下一行分配时崩溃。这是否意味着像这样的数字我没有足够的内存??
谢谢。
最佳答案
在我的机器上,这个程序编译、执行没有错误,并且在通过 valgrind 运行时报告没有内存问题。除非您在小型嵌入式系统上运行,否则您的问题很可能是此代码之外的问题,因为此程序分配的内存总量小于 140 KiB。
此外,当malloc
失败时,它不会崩溃,它会返回NULL。这段代码正确地检查了 eVectorsPrev
是否为 NULL,因此这里应该没有 NULL 取消引用问题。
关于c++ - 内存分配问题 C/Cpp Windows 严重错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2487010/