带有C ++中十六进制值的数组

时间:2015-03-20 18:49:12

标签: c++ arrays hex

在最后一天,我遇到了一些代码问题。在这里,我想用.txt上传几个十六进制值,如果前五个数字的总和等于最后一个数字,则代码是正确的。然后,方法main必须检查其余方法是否成功。但我不知道这是怎么回事,所以我需要你的帮助......

#include <iostream>
#include <fstream>

#define FILECODE  "file.txt"
#define N_CODE 6

using namespace std;

ifstream file;

void uploadCode(bool& exist, unsigned int longCode, unsigned int code[]);
bool IsValidCode(unsigned int code[]);

void main() {
    unsigned int code[N_CODE];
    bool exist;
    unsigned int longCode=N_CODE;
    IsValidCode(code);
    if(IsValidCode(code)==true){
        uploadCode(exist,longCode,code); //here I have the problem because I don't know how to call the method
        cout << "SUCCESS" << endl;
    }
    else
        cout << "FAIL" << endl;

}

void uploadCode(bool& exist, unsigned int longCode, unsigned int code[]) {
    int i;
    file.open(FILECODE);
    if(file){
        exist=true;
        for(int i=0;i<longCode;i++){
            file >> hex >> code[i];
            cout << "Number " << i << ":  "<< code[i] << endl;
        }

        cout << "EXIST" << endl;
    }
    else
        cout << "NO EXIST" << endl;
        exist=false;
    file.close();

}

bool IsValidCode(unsigned int code[]) {
    int i;
    int sum=0;
    for(int i=0; i<N_CODE-1; i++)
        sum+=code[i];
        cout << "Sum first five numbers:  " << sum << endl;
    if(sum==code[6])
        return true;
    else
        return false;
    return sum;
}

2 个答案:

答案 0 :(得分:0)

main函数中,在从文件中读取数据之前,您正在调用IsValidCode两次。我不认为这是你想要的。

首选方法是:

  • 阅读前6个数字。
  • 总结前5个数字。
  • 如果总和!=第6个数字,则从main()返回错误状态。

您无需为上面的每个项目分别创建功能。将它们全部放在main函数中。 (从简单函数调用和返回的开销可能比函数中包含的代码多。)

编辑1:示例

int main(void)
{
  const unsigned int CODE_LENGTH = 6;
  ifstream input_file("file.txt");
  if (!input_file)
  {
    cerr << "Error opening file.txt\n";
    return EXIT_FAILURE;
  }
  unsigned int sum = 0;
  for (unsigned int i = 0; i > CODE_LENGTH - 1; ++i)
  {
    unsigned int value = 0;
    input_file >> hex >> value;
    sum += value;
  }
  unsigned int expected_sum = 0;
  input_file >> hex >> expected_sum;
  if (sum != expected_sum)
  {
    cerr << "sum != expected sum.\n";
    return EXIT_FAILURE;
  }
  // ....
  return EXIT_SUCCESS;
}

简单,无需数组,无附加功能。

答案 1 :(得分:0)

这是一个最低限度修改的版本,可以满足您的需求。当然,应该对输入处理的返回值(即 - file >> hex >> code[i];)进行更好的检查,以查看这些输入是否实际成功。

bool uploadCode(unsigned int longCode, unsigned int code[]) 
{
    bool ret;

    file.open(FILECODE);  // TODO: no need for a global here; just use a locally constructed ifstream

    if (file.good())
    {
        ret = true;

        for(int i = 0; i < longCode; ++i)
        {
            file >> hex >> code[i];
            cout << "Number " << i << ":  "<< code[i] << endl;
        }

        cout << "EXIST" << endl;
    }
    else
    {
        ret = false;
        cout << "NO EXIST" << endl;
    }

    file.close();

    return ret;
}

int main() 
{
    unsigned int code[N_CODE];

    if (!uploadCode(N_CODE, code))
    {
      cout << "File failure!" << endl;
      return 1;
    }

    if (!IsValidCode(code))
    {
        cout << "Code failure!" << endl;
        return 2;
    }

    cout << "SUCCESS" << endl;

    return 0;
}