printf moves cursor to the beginning of the line-CodePudding

I have the following snippet which I'm trying to log into the terminal for debug purposes:

void DebugVector(vector<string> word_list) {
  size_t word_count = word_list.size();
  for (int i = 0; i < word_count; i  ) {
    for (int j = 0; j < word_count; j  ) {
      if (i == 156 && j == 156) {
        fflush(stdout);
        printf("We're supposed to find the word with value lares; ");
        fflush(stdout);
        const char *wordi = word_list[i].c_str();
        const char *wordj = word_list[j].c_str();
        printf("Actual values are %s and %s", wordi, wordj);
        fflush(stdout);
      }
    }
  }
}

I'm using Windows with the Windows Subsystem for Linux feature turned on and when I'm building the program with the following command

cl.exe /Zi /EHsc /nologo /Fe: C:\Users\user\Documents\VSCode_projects\test_program\main.exe C:\Users\user\Documents\VSCode_projects\test_program\main.cpp

and after I run it, the output is

We're supposed to find the word with value lares; Actual values are lares and lares

However, when I'm running it from the bash terminal in Windows, after building it with the following command:

$ g main.cpp -o main-linux.exe && ./main-linux.exe

The output is

and laresosed to find the word with value lares; Actual values are lares

It looks like the cursor is moved to the beginning of the line right after printing the first string. From what I understand c_str only outputs null terminated values, so I don't understand why this could happen.

I've tried creating a concatenated string, using cout instead, and I'm getting pretty much the same result. Also, the word_list has about 10,000 words in it, so I believe I'm not accessing any out of range values.

Is there anything that I can do here to make the program output the correct value?

CodePudding user response：

The issue was from the difference getline() makes when compiled with g and cl.exe. The vector was generated via this code:

if (list_file.is_open()) {
    while (getline(list_file, line)) {
      word_list.push_back(line);
    }
  }

getline() deals with new line in windows differently which is not very surprising. g will read the word including the carriage return (\r) value while cl.exe won't. This results in the print issue.

CodePudding user response：

you can't access vector elements with subscript like array because its object and it has address storage values

instead use .at() method of vector https://www.geeksforgeeks.org/vector-in-cpp-stl/ here in the element access method

and c_str() here works fine! no issue with that...