[fscanf][fseek][ftell][C language] fscanf to scan a file, but the file is no data inside.

[fscanf][fseek][ftell][C language] fscanf to scan a file, but the file is no data inside.

/*

   《Sample of C Program》

    function： stdio.h --> How to use fscanf()

    Explain : Use fscanf to scan a file,

              But the file is no data inside.

              Must add more function to determine.

    Author：FKC

    Date：2013/03

*/



#include <stdio.h>

#include <stdlib.h>

 

int main(void)

{

    FILE *fPtr;

    int TEST;

     

    fPtr = fopen("happy.txt", "r");

    if (!fPtr) {

        printf("Open File Failure...\n");

        exit(1);

    }

    

    fseek(fPtr, 0, SEEK_END);



    if (ftell(fPtr) == 0)

    {

        printf("No Data");

    }

    else

    {

        fscanf(fPtr, "%d",&TEST);

        printf("%d\n",TEST);

    }

    fclose(fPtr);



    return 0;

}

 

Reference :

• 
  C 語言標準函數庫分類導覽 - stdio.h fscanf()


• 
  fseek() rewind()


• 
  ftell