Compare to files，printing the first line where they differ

最新推荐文章于 2024-12-12 09:10:30 发布

原创最新推荐文章于 2024-12-12 09:10:30 发布 · 618 阅读

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此博客展示了如何使用C/C++编程语言通过比较两个文本文件的内容来找出它们之间的差异。程序通过逐行读取文件并比较字符，一旦发现不匹配立即停止比较并输出差异。

[code=C/C++]
#include<stdio.h>

# define SIZE 100

int compareTxt(FILE *fp1,FILE *fp2);
void show_file(char *name);

int main()
{
	FILE *fp1 = fopen("txt1.txt","r");
	FILE *fp2 = fopen("txt2.txt","r");
	/*place the pointer to the beginning of the file,which point to the file*/
	rewind(fp1);
	rewind(fp2);
	//show_file("txt2.txt");
	compareTxt(fp1,fp2);
	return 0;
}

int compareTxt(FILE *fp1,FILE *fp2)
{
	char c1,c2;
	char *line = new char[SIZE];
	while(!feof(fp1) && !feof(fp2))
	{
		if((c1=fgetc(fp1)) != (c2 = fgetc(fp2)))
		{
            fgets(line,SIZE,fp1);
			printf("File 1:%c%s\n",c1,line);
			fgets(line,SIZE,fp2);
			printf("File 2:%c%s\n",c2,line);
			break;
		}
	}
	if(c1 == EOF && c2 == EOF)
	{
		printf("Two files are the same.");
		fclose(fp1);
		fclose(fp2);
		return 1;
	}
	else if(c1 != EOF && c2 == EOF)
	{
		fgets(line,SIZE,fp1);
		fclose(fp1);
		fclose(fp2);
		printf("%s \n",line);
		return -1;
	}
	else
	{
		fgets(line,SIZE,fp2);
		fclose(fp1);
		fclose(fp2);
		printf("%s \n",line);
		return -1;
	}
}

void show_file(char *name)
{
	FILE *fp = fopen(name,"r");
	char c;
	while((c = fgetc(fp)) != EOF)
	{
		printf("%c",c);
	}
	fclose(fp);
}
[/code]