C中的fgetc()和fputc()

fgetc()

fgetc()用于一次从文件单个字符获取输入。该函数返回字符的ASCII码读取函数。它返回存在于文件指针指示的位置的字符。读取字符，文件指针将前进到下一个字符。如果指针位于文件末尾或发生错误，则此函数将返回EOF文件。
句法：

int fgetc(FILE *pointer)
pointer: pointer to a FILE object that identifies 
the stream on which the operation is to be performed.

C

// C program to illustate fgetc() function
#include 
 
int main ()
{
    // open the file
    FILE *fp = fopen("test.txt","r");
 
    // Return if could not open file
    if (fp == NULL)
      return 0;
 
    do
    {
        // Taking input single character at a time
        char c = fgetc(fp);
 
        // Checking for end of file
        if (feof(fp))
            break ;
 
        printf("%c", c);
    }  while(1);
 
    fclose(fp);
    return(0);
}

输出：

The entire content of file is printed character by
character till end of file. It reads newline character
as well.

使用fputc()

fputc()用于一次将单个字符写入给定文件。它将给定字符写入文件指针指示的位置，然后前进文件指针。
该函数返回在成功执行写入操作的情况下写入的字符，否则在返回错误EOF的情况下返回。
句法：

int fputc(int char, FILE *pointer)
char:  character to be written. 
This is passed as its int promotion.
pointer: pointer to a FILE object that identifies the 
stream where the character is to be written.

C

// C program to illustate fputc() function
#include
int main()
{
    int i = 0;
    FILE *fp = fopen("output.txt","w");
 
    // Return if could not open file
    if (fp == NULL)
      return 0;
 
    char string[] = "good bye", received_string[20];
 
    for (i = 0; string[i]!='\0'; i++)
 
        // Input string into the file
        // single character at a time
        fputc(string[i], fp);
 
    fclose(fp);
    fp = fopen("output.txt","r");
 
    // Reading the string from file
    fgets(received_string,20,fp);
 
    printf("%s", received_string);
 
    fclose(fp);
    return 0;
}

输出：

good bye

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