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Source Code
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#include <stdio.h>
#include <stdlib.h>
void main()
{
char fname[20], ch;
FILE *fpts, *fptt;
printf("\n\n Encrypt a text file :\n");
printf("--------------------------\n");
printf(" Input the name of file to encrypt : ");
scanf("%s",fname);
fpts=fopen(fname, "r");
if(fpts==NULL)
{
printf(" File does not exists or error in opening..!!");
exit(1);
}
fptt=fopen("temp.txt", "w");
if(fptt==NULL)
{
printf(" Error in creation of file temp.txt ..!!");
fclose(fpts);
exit(2);
}
while(1)
{
ch=fgetc(fpts);
if(ch==EOF)
{
break;
}
else
{
ch=ch+100;
fputc(ch, fptt);
}
}
fclose(fpts);
fclose(fptt);
fpts=fopen(fname, "w");
if(fpts==NULL)
{
printf(" File does not exists or error in opening..!!");
exit(3);
}
fptt=fopen("temp.txt", "r");
if(fptt==NULL)
{
printf(" File does not exists or error in opening..!!");
fclose(fpts);
exit(4);
}
while(1)
{
ch=fgetc(fptt);
if(ch==EOF)
{
break;
}
else
{
fputc(ch, fpts);
}
}
printf(" File %s successfully encrypted ..!!\n\n", fname);
fclose(fpts);
fclose(fptt);
}
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