从键盘输入字符保存到文件

使用fgetc/fputc实现
***************************************************
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define SIZE 512
int main(int argc,char *argv[])
{
 FILE *in;
 char buffer[SIZE];
 int n_chars;
 char ch;
 if((in=fopen(argv[1],"w+"))==NULL)
{
 perror("fopen 1 error!");
}
 memset(buffer,0,SIZE);

  ch=fgetc(stdin);
 while(ch!='/n')
{
 while(ch!='/n')
{
  if(fputc(ch,in)==EOF)
    perror("fputc error!");
  ch=fgetc(stdin);
}
fputc(ch,in);

 fseek(in,10,SEEK_CUR);
ch=fgetc(stdin); 
}
 fseek(in,0,SEEK_SET);
 
 while((n_chars=fread(buffer,1,SIZE,in))>0)
 {
    if(fwrite(buffer,1,n_chars,stdout)!=n_chars)
        perror("fwrite stdout error!");
}
fclose(in);
return 0;
}

*******************************************************
使用fgets/fputs实现

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define SIZE 512
int main(int argc,char *argv[])
{
 FILE *in;
 char buffer[SIZE];
 int n_chars;
 char ch;
 if((in=fopen(argv[1],"w+"))==NULL)
{
 perror("fopen 1 error!");
}
 memset(buffer,0,SIZE);

while(fgets(buffer,SIZE,stdin)!=NULL)
{
 
 buffer[strlen(buffer)]='/0';
 if(strcmp(buffer,"stop/n")==0)break;
 if(fputs(buffer,in)==EOF)
 {
 printf("it is error!");
 }
}
 
 fseek(in,0,SEEK_SET);
 
 while((n_chars=fread(buffer,1,SIZE,in))>0)
 {
    if(fwrite(buffer,1,n_chars,stdout)!=n_chars)
        perror("fwrite stdout error!");
}
fclose(in);
return 0;
}