파일 오픈 예제

#include<stdio.h>
void main()
{
    FILE *fp1, *fp2;
    char c;
    fp1=fopen("test1.txt","w");
    while((c=getchar())!=EOF)
        putc(c,fp1);
    fclose(fp1);

    fp1=fopen("test1.txt","r");
    fp2=fopen("test2.txt","w");
    while((c=getc(fp1))!=EOF)
        putc(c,fp2);
    fclose(fp2);
    fclose(fp1);

    fp2=fopen("test2.txt","r");
    while((c=getc(fp2))!=EOF)
        putchar(c);
    fclose(fp2);

}