ofstream与fprintf写入6行world文件失败，合并行则正常

我需要生成一个包含6行数据的world文件。使用ofstream时，若每行写入单个字段共6行，文件无任何输出；若将最后两个字段合并到同一行（共5行），则数据输出正常。使用fprintf时也出现相同问题：最后两个字段用空格分隔在同一行可成功写入，用换行分隔成两行则无文件输出。相关代码示例如下：

可正常输出的ofstream代码 #

double ResEast = 0.05;
double ResNorth = -0.05;
double UTMMinEast = 459947.750;
double UTMMaxNorth = 7564825.450;
std::ofstream outputfile;
outputfile.open(worldoutname, std::ofstream::out);
outputfile << std::setprecision(12);
if (outputfile.is_open()) {

    outputfile << ResEast << endl;
    outputfile << "0.0" << endl;
    outputfile << "0.0" << endl;
    outputfile << ResNorth << endl;
    outputfile << UTMMinEast << "  " ;
    outputfile << UTMMaxNorth << endl;
    outputfile.close();
}

else
{
    std::cerr << "didn't write" << std::endl;
}

无输出的ofstream代码 #

double ResEast = 0.05;
double ResNorth = -0.05;
double UTMMinEast = 459947.750;
double UTMMaxNorth = 7564825.450;

std::ofstream outputfile;
outputfile.open(worldoutname, std::ofstream::out);
outputfile << std::setprecision(12);
if (outputfile.is_open()) {

    outputfile << ResEast << endl;
    outputfile << "0.0" << endl;
    outputfile << "0.0" << endl;
    outputfile << ResNorth << endl;
    outputfile << UTMMinEast << endl;
    outputfile << UTMMaxNorth << endl;
    outputfile.close();
}

else
{
    std::cerr << "didn't write" << std::endl;
}

可正常输出的fprintf代码 #

FILE* pFile;
const int length = worldoutname.length();
// declaring character array (+1 for null terminator)
char* char_array = new char[length + 1];
// copying the contents of the
// string to char array
strcpy(char_array, worldoutname.c_str());
fopen_s(&pFile,char_array,"w");

double ResEast = 0.05;
double ResNorth = -0.05;
double UTMMinEast = 459947.750;
double UTMMaxNorth = 7564825.450;

fprintf_s(pFile, "%f\n0.0\n0.0\n%f\n%f %f\n", ResEast, ResNorth, UTMMinEast, UTMMaxNorth);
fclose(pFile);

无输出的fprintf代码 #

FILE* pFile;
const int length = worldoutname.length();
// declaring character array (+1 for null terminator)
char* char_array = new char[length + 1];
// copying the contents of the
// string to char array
strcpy(char_array, worldoutname.c_str());
fopen_s(&pFile,char_array,"w");

double ResEast = 0.05;
double ResNorth = -0.05;
double UTMMinEast = 459947.750;
double UTMMaxNorth = 7564825.450;

fprintf_s(pFile, "%f\n0.0\n0.0\n%f\n%f\n%f\n", ResEast, ResNorth, UTMMinEast, UTMMaxNorth);
fclose(pFile);

内容的提问来源于stack exchange，提问作者User1953