A code for Dear Sachida Barik To Exchange two word in a text file

interchange.c

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

//count_data();

void main()
{
   // calling function
   count_data();
   getch();
}
count_data() // function for count no of words,lines & characters.
{
	   FILE *fp,*fp_rep;
	   char ch,ch1,temp_str[50],first_str[10],second_str[10];
	   int count=0; // counter
	   clrscr();


	   fp=fopen("c:\\a.txt","r");
	   fp_rep=fopen("c:\\out.txt","w");

	   printf("\nEnter String to find:");
	   scanf("%s",first_str);
	   printf("\nEnter String to replace:");
	   scanf("%s",second_str);

	while((ch=getc(fp))!=EOF)
	{
		if(ch==' ')
		{
			temp_str[count]='\0';
			if(strcmp(temp_str,first_str)==0)
			{
				fprintf(fp_rep," %s",second_str);
				count=0;

			}
			else if (strcmp(temp_str,second_str)==0)
			{
				fprintf(fp_rep," %s",first_str);
				count=0;
			}
			else
			{
				fprintf(fp_rep," %s",temp_str);
				count=0;
			}
		}
		else
		{
			temp_str[count++]=ch;
		}
	}
	if(strcmp(temp_str,first_str)==0)
	{

		fprintf(fp_rep,"%s ",second_str);
		count=0;

	}
	if(strcmp(temp_str,second_str)==0){
		fprintf(fp_rep,"%s ",second_str);
		count=0;	
	}
	else
	{
		fprintf(fp_rep,"%s ",temp_str);
	}

    fclose(fp);
    fclose(fp_rep);
    remove("c:\\a.txt");
    rename("c:\\out.txt","c:\\a.txt");
    fflush(stdin);

}