《C语言及程序设计》实践参考——由键盘到文件

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【项目1-由键盘到文件】
（1）从键盘输入一个文件名，以及一个以#结束的字符序列，将输入的字符保存到文件中去。

#include "stdio.h"
#include "stdlib.h"
int main()
{
    FILE *fp ;
    char ch,fname[10];
    printf("文件名:");
    gets(fname);
    if ((fp=____(1)____)==NULL)
    {
        printf("connot open\n");
        exit(0);
    }
    while ((ch=getchar())!='#')
        fputc(____(2)____);
    ____(3)____;
    return 0;
}

#include "stdio.h"
#include "stdlib.h"
int main()
{
    FILE *fp ;
    char ch,fname[10];
    printf("文件名:");
    gets(fname);
    if ((fp=fopen(fname, "w"))==NULL)  //(1)
    {
        printf("connot open\n");
        exit(0);
    }
    while ((ch=getchar())!='#')
        fputc(ch,fp);   //（2）
    fclose(fp);   //(3)
    return 0;
}

#include "stdio.h"
#include "stdlib.h"
int main()
{
    FILE *fp1,*fp2 ;
    char c;
    if (（fp1=fopen("f1.dat", ___(1)___)）==NULL)
    {
        printf("connot open\n");
        exit(0);
    }
    if (（fp2=fopen("f2.dat", ___(2)___)）==NULL)
    {
        printf("connot open\n");
        exit(0);
    }
    c=fgetc(fp1);
    while (___(3)___)
    {
        fputc(c,fp2);
        c=fgetc(fp1);
    }
    ___(4)___      
    return 0;
}

#include "stdio.h"
#include "stdlib.h"
int main()
{
    FILE *fp1,*fp2 ;
    char c;
    if ((fp1=fopen("f1.dat", "r"))==NULL)  //(1)
    {
        printf("connot open\n");
        exit(0);
    }
    if ((fp2=fopen("f3.dat", "w"))==NULL)  //(2)
    {
        printf("connot open\n");
        exit(0);
    }
    c=fgetc(fp1);
    while (c!=EOF)  //(3)：或者!feof(fp1)，feof函数用于检查是否到达文件尾
    {
        fputc(c,fp2);
        c=fgetc(fp1);
    }
    fclose(fp2); fclose(fp1); //(4)
    return 0;
}

#include "stdio.h"
#include "stdlib.h"
int main()
{
    FILE ___(1)___;
    char ch;
    fp1=fopen("file1.dat","r");
    fp2=fopen("file2.dat","w");
    while (!feof(fp1))
    {
        ch=___(2)___;
        putchar(ch);
        fputc(___(3)___);
    }
    fclose(fp1);
    fclose(fp2) ;
    return 0;
}

#include "stdio.h"
#include "stdlib.h"
int main()
{
    FILE *fp1, *fp2;  //(1)
    char ch;
    fp1=fopen("file1.dat","r");
    fp2=fopen("file2.dat","w");
    while (!feof(fp1))
    {
        ch=fgetc(fp1);  //(2)
        putchar(ch);
        fputc(ch, fp2);  //(3)
    }
    fclose(fp1);
    fclose(fp2) ;
    return 0;
}