C语言-文件压缩程序(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，记录一下文件输入 输出

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

#define SIZE	40

int main(int argc, char *argv[])
{
	char name[SIZE];
	int ch;

	FILE *in, *out;

	int count = 0;

	if(argc < 2)
	{
		fprintf(stderr, "Usage: %s filename.\\n", argv[0]);
		exit(1);
	}
	if((in = fopen(argv[1], "r")) == NULL)
	{
		fprintf(stderr, "I couldn't open the file %s\\n", argv[1]);
		exit(2);
	}
	strcpy(name, argv[1]);//
	strcat(name, ".red");

	if((out = fopen(name, "a")) == NULL)
	{
		fprintf(stderr, "Can't create output file.\\n");
		exit(3);
	}
	while((ch = getc(in)) != EOF)
	{
		if(count++ % 3 == 0)
			putc(ch, out);
	}
	if(fclose(in) != 0 || fclose(out) != 0)
		fprintf(stderr, "Error in closing the files.\\n");

	return 0;
}

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