c++ - MPIIO基于C++写整数

Question

我想在输出文件中写入整数 b 。我尝试提供a的地址，但它只输出前几个字符，字符后没有数字。

这是我的代码：

#include <cmath>
#include <fstream>
#include <iomanip>
#include <cstdlib>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>

int main(int argc, char *argv[])
{
    int rank;
    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    MPIO_Request request;
    MPI_Status status;
    MPI_Offset offset = 0;
    MPI_File fh;

    std::string str1 = "output";
    const char *na = str1.c_str();
    std::string str2 = "#!TDV112";
    const char *version = str2.c_str();

    MPI_File_open(MPI_COMM_WORLD, na, MPI_MODE_CREATE | MPI_MODE_WRONLY, MPI_INFO_NULL, &fh);

    if (rank == 0)
    {

        MPI_File_seek(fh, offset, MPI_SEEK_SET);
        // header !version number
        MPI_File_write(fh, version, 8, MPI_CHAR, &status);
        // INTEGER 1
        int a = 1;

        MPI_File_write(fh, &a, 1, MPI_INT, &status);
    }

    return 0;
}