double类型数据的文件读写

#include <stdio.h>

int main()

{

double eph[6];

eph[0] = 937454.382812;

eph[1] = 3126518.617188;

eph[2] = 6271050.976562;

eph[3] = 4030.750196;

eph[4] = 5411.685772;

eph[5] = -3296.477765;





FILE *pfile;

pfile = fopen("test.txt", "w");



printf("%d", sizeof(eph[0]));

fwrite(eph, 8, 1, pfile);

fwrite(eph + 1, 8, 1, pfile); // fwrite()的用法参见www.cplusplus.com

fwrite(eph + 2, 8, 1, pfile);

fwrite(eph + 3, 8, 1, pfile);

fwrite(eph + 4, 8, 1, pfile);

fwrite(eph + 5, 8, 1, pfile);



fclose(pfile);





FILE *pfile2;

pfile2 = fopen("test.txt", "r");

double eph2[6];



fread(eph2, 8, 1, pfile2);

fread(eph2 + 1, 8, 1, pfile2);

fread(eph2 + 2, 8, 1, pfile2);

fread(eph2 + 3, 8, 1, pfile2);

fread(eph2 + 4, 8, 1, pfile2);

fread(eph2 + 5, 8, 1, pfile2);



printf("%f\n", eph2[0]);

printf("%f\n", eph2[1]);

printf("%f\n", eph2[2]);

printf("%f\n", eph2[3]);

printf("%f\n", eph2[4]);

printf("%f\n", eph2[5]);

fclose(pfile2);



return 0;

}

Output:

8937454.382812

3126518.617188

6271050.976562

4030.750196

5411.685772

-3296.477765