比较两个文件是否相同（C/C++语言）

#include <stdio.h>
#include <string.h>
const int max_r = 1024;

// Calculate the file size
void Get_file_size(char *name_1, char *name_2)
{
    FILE *fp_1 = fopen(name_1, "r");
    FILE *fp_2 = fopen(name_2, "r");
    if (fp_1)
    {
        printf ("Size of %s : ", name_1);
        fseek(fp_1, 0,  SEEK_END);
        if (1.*ftell(fp_1)/(1024*1024*1024) > 1.0)
               printf("%.1f GB
", 1.*ftell(fp_1)/(1024*1024*1024));
           else if(1.*ftell(fp_1)/(1024*1024) > 1.0)
               printf("%.1f MB
", 1.*ftell(fp_1)/(1024*1024));
           else if (1.*ftell(fp_1)/(1024) > 1.0)
               printf("%.1f KB
", 1.*ftell(fp_1)/(1024));
           else printf ("%d Bt
", ftell(fp_1));
        fclose(fp_1);
    }
    if (fp_2)
    {
        printf ("Size of %s : ", name_2);
        fseek(fp_2, 0,  SEEK_END);
        if (1.*ftell(fp_2)/(1024*1024*1024) > 1.0)
               printf("%.1f GB
", 1.*ftell(fp_2)/(1024*1024*1024));
           else if(1.*ftell(fp_2)/(1024*1024) > 1.0)
               printf("%.1f MB
", 1.*ftell(fp_2)/(1024*1024));
           else if (1.*ftell(fp_2)/(1024) > 1.0)
               printf("%.1f KB
", 1.*ftell(fp_2)/(1024));
           else printf ("%d Bt
", ftell(fp_2));
        fclose(fp_2);
    }
    return;
}

int main()
{
    int AC, line_1, line_2;
    char name_1[100], name_2[100];
    char ch_1[max_r], ch_2[max_r];
    
    scanf ("%s%s", name_1, name_2);//input two file which need to be compared 
    AC = 1;
    line_1 = line_2 = 0;
    Get_file_size(name_1, name_2);
    
    FILE *fp_1 = fopen(name_1, "r");
    FILE *fp_2 = fopen(name_2, "r");
    while(1)
    {
        char *end_1, *end_2;
        end_1 = fgets(ch_1, max_r, fp_1);
        end_2 = fgets(ch_2, max_r, fp_2);
        if (end_1 != NULL)
            line_1 ++;
        if (end_2 != NULL)
            line_2 ++;
        while(strcmp(ch_1, "
") == 0 && end_1 != NULL)
        {
            end_1 = fgets(ch_1, max_r, fp_1);
            if (end_1 != NULL)
                line_1 ++;
        }
        while(strcmp(ch_2, "
") == 0 && end_2 != NULL)
        {
            end_2 = fgets(ch_2, max_r, fp_2);
            if (end_2 != NULL)
                line_2 ++;
        }
        if (end_1 == NULL && end_2 == NULL)
            break;
        if(strcmp(ch_1, ch_2) != 0)
        {
            AC = 0;
            ch_1[strlen(ch_1) -1] = '';
            ch_2[strlen(ch_2) -1] = '';
            printf ("    Worry Answer
");
            printf ("In file %s at %d line << %s >> difference from
", name_1, line_1, ch_1);
            printf ("In file %s at %d line << %s >>
", name_2, line_2, ch_2);
            break;
        }
    }
    if (AC)
    {
        if (line_1 != line_2)
        {
            printf ("    Print Error
");
            printf ("The print not in a canonical format!
");
            printf ("the %s have %d lines 
but %s have %d lines!
", name_1, line_1, name_2, line_2);
        }
        else
            printf ("    Aceept
", line_1, line_2);
    }
    fclose(fp_1);
    fclose(fp_2);
    return 0;
}