Write a program to reverse the content of a file.
#include<stdio.h>
#include"fileinfo.h"
#include<string.h>
void Reverse_Content_of_File(FILE*,char*);
int main()
{
char file[32];
FILE *fp;
printf("Enter File Name = ");
scanf("%[^\n]",file);
fp = fopen(file,"r");
if(fp == NULL)
{
printf("file is not present in this directory\n");
return 0;
}
Reverse_Content_of_File(fp,file);
return 0;
}
void Reverse_Content_of_File(FILE *fp,char* filename)
{
char *p,ch;
int i,j,CharCount = 0;
CharCount = Get_Total_Chars(fp);
p = malloc(CharCount+1);
i = 0;
while((ch = fgetc(fp)) != EOF)
{
p[i] = ch;
i++;
}
p[i] = '\0';
for(i = 0,j = (strlen(p)-1);i < j;i++,j--)
{
ch = p[i];
p[i] = p[j];
p[j] = ch;
}
fclose(fp);
fp = fopen(filename,"w");
for(i = 0;i < CharCount; i++)
{
fputc(p[i],fp);
}
//fputs(p,fp);
printf("Reversing Done....\n");
}
Note: File name d1 is present in the current working directory.
cat d1 Lot To Learn BlackBerry Z10 Iphone Incredible India
./a.out Enter File Name = d1 Reversing Done....
cat d1 aidnI elbidercnI enohpI 01Z yrreBkcalB nraeL oT toL
./a.out Enter File Name = d1 Reversing Done....
cat d1 Lot To Learn BlackBerry Z10 Iphone Incredible India