c語言-同步讀寫檔案

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
    printf("Hello world!\n");
    FILE *pf;
    //int i=0;
    char buf[513];
    char buf0[100];
    pf=fopen("runoob.txt","r");
FILE *fp_w = fopen("data_out.txt", "w");
    while(fgets(buf,512,pf) != NULL)
    {
        printf("%s",buf);
//printf("\n");
fprintf(fp_w,"%s",buf);
    }
    fclose(pf);
printf("\n");
system("pause");
    return 0;
}

runoob.txt
aaaa
fdfddf

data_out.txt
aaaa
fdfddf