C program to Compare two files

[Ram Bharose]

Hello friends,

I an studying the C programming language. The syllabus is near to complete. But then also have one query to ask you. I am trying to code the c program to compare two files. I don't know which logic I need to implement in my c program code to compare two files. If you posses any c code for comparing two files then please let me know that. your help would be appreciated.

[Praetor]

Hi, Try below C program to Compare two files:

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

int cmpfles(void);
void main()

{
int rt =cmpfles();
printf("tn %d",result);
}

int cmpfles(void)
{
FILE *fpn1.*fpn2;

fpn1 = fopen(file1,'rn');
fpn2 = fopen(file1,'rn');

char c1n[15],cn2[15];
fgets(cn1,16,fpn1);
fgets(cn2,16,fpn2);

if(strcmp(cn1,cn2) = = 0)
{
return 1;
}

else return 0;
}

[Katty]

Hi friend,

Before code program for comparing two files first you need to write code to open these two files . To open files in C you need to use the function known as 'fopen(fileName,'r')'. After coding this then you need to write code to compare files. And for this use the 'strcmp(FileName1,FileName2)' function. You need to mention the name of files which you wan to compare. Use this two function and let me know if are getting any errors.

[kelfro]

Try something below code to compare two files:

main()
{

CFiles();
return 0;
}

CFiles()
{
FILE * cfp1;
FILE * cfp2;
char cx1[100] cx2[100];
int cmpx;

cfp1 fopen("Doc1.txt" "r");
cfp2 fopen("Doc2.txt" "r");

if((cfp1 NULL) || (cfp2 NULL))
{
printf("Error occurs in the file n");
}
else
{
while(fgets(cx1 15 cfp1) ! NULL)
puts(cx1);

while(fgets(cx2 15 cfp2) ! NULL)
puts(cx2);

if((cmpx strcmp(cx1 cx2)) 0)
{
printf("Files are same n");
}

else
{
printf("Files are differnt n");
}
}
}

[Zecho]

I think you should use the following while loop code in your C program for compare to files. In this code I have implemented the programming logic to compare two files using the 'While loop'. I suggest you to study carefully this while loop code:

while(!feof(flp1))
{
chl1 = fgetc(flp1);
if(ferror(fpl1))
{

printf("Error reading first file.\n");
exit(1);
}

chl2 = fgetc(flp2);

if(ferror(flp2))
{

printf("Error reading second file.\n");
exit(1);
}

if(chl1 != chl2)
{
printf("Files differ at byte number %lu", l);
same = 0;
break;
}

lp++;

}

[Reegan]

Hi friend,

Use following method code which compares two files:

int cmpfls(void)
{
FILE *fmp1.*fmp2;
fp1 fopen(fileNm1 'r'); // open the file1
fp2 fopen(fileNm1 'r'); // open the file2

char co1[15] co2[15];

fgets(co1 16 fmp1);
fgets(co2 16 fmp2);

if(strcmp(co1 co2) 0)
{
return 1;
}

else return 0;
}

[flipmedia]

Hi Friends,
I need a File Comparison logic friends , my need is
1)The program should be able to work in an interactive mode, i.e. take
two separate files, compare and be able to inform the user if
the program looks like copied
2)The copiers should not be able to cheat if they just change the
variable names.
3)The copiers should not be able to cheat if they add just spaces in
between the code lines or inside the code line.

Friends if you have any idea regarding this , reply me ...

Thankfully
Anes P.A