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C++ 数组自增相关问题

 1 year ago
source link: https://www.v2ex.com/t/884852
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C++ 数组自增相关问题

  Machard · 6 小时 27 分钟前 · 456 次点击

部分程序如下：

std::ifstream ifs;

ifs.open(fname.c_str());

double *dumypT;
double *dumyAmplitude;

for (int i=0; i< 10; ++i)
{
    ifs >> *dumypT >> *dumyAmplitude;

    std::cout << i << " " << dumypT[i] << " " << dumyAmplitude[i] << std::endl;

    dumypT++; dumyAmplitude++;
}

遇到的问题：为什么数组 dumypT[0]和 dumyAmplitude[0]有数据，而 i>=1 没有数据？

第 1 条附言  ·  5 小时 12 分钟前

为了避免其他问题，我现在将一部分程序改成了如下：

std::ifstream ifs;

ifs.open(fname.c_str());

double *dumypT        = new double [pts];
double *dumyAmplitude = new double [pts];

for (int ipt=0; ipt<pts; ++i)
{
    ifs >> *dumypT >> *dumyAmplitude;   // --- 怎样才能自增的读入数据元素？

    std::cout >> ipt >> " " >> dumypT[ipt] >> " " >> dumyAmplitude[ipt] >> std::endl;

    dumypT++; dumyAmplitude++;
}

现在遇到的问题，每次循环读入数据元素都是从0开始，我想要的效果是，读入的数组随着指标ipt而变化。


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