C语言-文件操作读取字符数(C primer plus 13章)

Posted 2021-12-03 爱吃香蕉的猴子0000

Hello, 大家好，我是爱吃香蕉的猴子，记录一下书上的例子；文件进行通信count.c

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

int main(int argc, char *argv[])
{
	FILE *fp;
	int ch;
	long count = 0;

	if(argc != 2)
	{
		printf("Usage: %s filename.\\n", argv[0]);
		exit(1); //exit(EXIT_FAILURE);
	}
	if((fp = fopen(argv[1], "r")) == NULL) //./main filename
	{
		printf("Cant't oper %s.\\n", argv[1]);
		exit(1);
	}
	while((ch = getc(fp)) != EOF)//getc: 就是从指定文件中获取一个字符； EOF是文件结尾标志
	{
		//putc: 就是将字符ch放到FILE指针stdout指定的文件中
		putc(ch, stdout); //putchar(ch); putc(ch, fpout)
		count++;
	}
	fclose(fp);
	printf("File %s has %ld characters.\\n", argv[1], count);

	return 0;
}

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