比较两个文件是否相同（C/C++语言）

  1 #include <stdio.h>
  2 #include <string.h>
  3 const int max_r = 1024;
  4 
  5 // Calculate the file size
  6 void Get_file_size(char *name_1, char *name_2)
  7 {
  8     FILE *fp_1 = fopen(name_1, "r");
  9     FILE *fp_2 = fopen(name_2, "r");
 10     if (fp_1)
 11     {
 12         printf ("Size of %s : ", name_1);
 13         fseek(fp_1, 0,  SEEK_END);
 14         if (1.*ftell(fp_1)/(1024*1024*1024) > 1.0)
 15                printf("%.1f GB
", 1.*ftell(fp_1)/(1024*1024*1024));
 16            else if(1.*ftell(fp_1)/(1024*1024) > 1.0)
 17                printf("%.1f MB
", 1.*ftell(fp_1)/(1024*1024));
 18            else if (1.*ftell(fp_1)/(1024) > 1.0)
 19                printf("%.1f KB
", 1.*ftell(fp_1)/(1024));
 20            else printf ("%d Bt
", ftell(fp_1));
 21         fclose(fp_1);
 22     }
 23     if (fp_2)
 24     {
 25         printf ("Size of %s : ", name_2);
 26         fseek(fp_2, 0,  SEEK_END);
 27         if (1.*ftell(fp_2)/(1024*1024*1024) > 1.0)
 28                printf("%.1f GB
", 1.*ftell(fp_2)/(1024*1024*1024));
 29            else if(1.*ftell(fp_2)/(1024*1024) > 1.0)
 30                printf("%.1f MB
", 1.*ftell(fp_2)/(1024*1024));
 31            else if (1.*ftell(fp_2)/(1024) > 1.0)
 32                printf("%.1f KB
", 1.*ftell(fp_2)/(1024));
 33            else printf ("%d Bt
", ftell(fp_2));
 34         fclose(fp_2);
 35     }
 36     return;
 37 }
 38 
 39 int main()
 40 {
 41     int AC, line_1, line_2;
 42     char name_1[100], name_2[100];
 43     char ch_1[max_r], ch_2[max_r];
 44     
 45     scanf ("%s%s", name_1, name_2);//input two file which need to be compared 
 46     AC = 1;
 47     line_1 = line_2 = 0;
 48     Get_file_size(name_1, name_2);
 49     
 50     FILE *fp_1 = fopen(name_1, "r");
 51     FILE *fp_2 = fopen(name_2, "r");
 52     while(1)
 53     {
 54         char *end_1, *end_2;
 55         end_1 = fgets(ch_1, max_r, fp_1);
 56         end_2 = fgets(ch_2, max_r, fp_2);
 57         if (end_1 != NULL)
 58             line_1 ++;
 59         if (end_2 != NULL)
 60             line_2 ++;
 61         while(strcmp(ch_1, "
") == 0 && end_1 != NULL)
 62         {
 63             end_1 = fgets(ch_1, max_r, fp_1);
 64             if (end_1 != NULL)
 65                 line_1 ++;
 66         }
 67         while(strcmp(ch_2, "
") == 0 && end_2 != NULL)
 68         {
 69             end_2 = fgets(ch_2, max_r, fp_2);
 70             if (end_2 != NULL)
 71                 line_2 ++;
 72         }
 73         if (end_1 == NULL && end_2 == NULL)
 74             break;
 75         if(strcmp(ch_1, ch_2) != 0)
 76         {
 77             AC = 0;
 78             ch_1[strlen(ch_1) -1] = '';
 79             ch_2[strlen(ch_2) -1] = '';
 80             printf ("    Worry Answer
");
 81             printf ("In file %s at %d line << %s >> difference from
", name_1, line_1, ch_1);
 82             printf ("In file %s at %d line << %s >>
", name_2, line_2, ch_2);
 83             break;
 84         }
 85     }
 86     if (AC)
 87     {
 88         if (line_1 != line_2)
 89         {
 90             printf ("    Print Error
");
 91             printf ("The print not in a canonical format!
");
 92             printf ("the %s have %d lines 
but %s have %d lines!
", name_1, line_1, name_2, line_2);
 93         }
 94         else
 95             printf ("    Aceept
", line_1, line_2);
 96     }
 97     fclose(fp_1);
 98     fclose(fp_2);
 99     return 0;
100 }

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原文地址：https://www.cnblogs.com/shengshouzhaixing/p/3418535.html