使用netcdf库读取nc文件的c语言代码

以下是使用netcdf库读取nc文件的c语言代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <netcdf.h>

#define FILE_NAME "example.nc"

int main()
{
    int ncid, varid;
    int status;
    size_t latlen, lonlen;
    float *lat, *lon, *data;

    // Open the file
    if ((status = nc_open(FILE_NAME, NC_NOWRITE, &ncid)))
        goto error;

    // Get the variable id
    if ((status = nc_inq_varid(ncid, "lat", &varid)))
        goto error;

    // Get the variable length
    if ((status = nc_inq_dimlen(ncid, varid, &latlen)))
        goto error;

    // Allocate memory for the variable
    lat = (float*) malloc(latlen * sizeof(float));

    // Read the variable data
    if ((status = nc_get_var_float(ncid, varid, lat)))
        goto error;

    // Repeat for the "lon" variable
    if ((status = nc_inq_varid(ncid, "lon", &varid)))
        goto error;
    if ((status = nc_inq_dimlen(ncid, varid, &lonlen)))
        goto error;
    lon = (float*) malloc(lonlen * sizeof(float));
    if ((status = nc_get_var_float(ncid, varid, lon)))
        goto error;

    // Repeat for the "data" variable
    if ((status = nc_inq_varid(ncid, "data", &varid)))
        goto error;
    data = (float*) malloc(latlen * lonlen * sizeof(float));
    if ((status = nc_get_var_float(ncid, varid, data)))
        goto error;

    // Output the data
    for (size_t i = 0; i < latlen; i++) {
        for (size_t j = 0; j < lonlen; j++) {
            printf("(%f, %f): %f\n", lat[i], lon[j], data[i*lonlen+j]);
        }
    }

    // Close the file and free the memory
    nc_close(ncid);
    free(lat);
    free(lon);
    free(data);

    return 0;

error:
    printf("Error: %s\n", nc_strerror(status));
    return 1;
}

这段代码打开名为 "example.nc" 的文件，读取其中名为 "lat"、"lon" 和 "data" 的三个变量，并将它们的值输出到屏幕上。在使用该代码时，请确保在编译时链接 netcdf 库。