#include <stdio.h>
#include <stdlib.h>
#define read "C:\\read.txt"
#define write "C:\\write.txt"
typedef struct{
        char ID[10];
        char name[6];
        char age[3];   // 你的read.txt裡第三行應該也沒enter到，補上enter，然後這裡原本是age[2]  把每行\n 算1加上去所以改3
}DATA;
int main(void)
{
    FILE *readPtr, *writePtr;
    DATA data;
    readPtr = fopen(read, "r");
    writePtr = fopen(write, "a");
    if (!readPtr) {
        printf("read.txt fail to open...\n");
    }
    else if(!writePtr) {
         printf("write.txt fail to open...\n");
    }

else{
         while(!feof(readPtr)){
               fread(&data, sizeof(DATA), 1, readPtr);
               fwrite(&data, sizeof(DATA), 1, writePtr);
               fprintf(writePtr,"\0"); //為了換行
         }
    }
    fclose(readPtr);
    fclose(writePtr);
    system("pause");
    return 0;
}