How to calculate total time & remaining time.

I am not surprised you are getting what you consider the wrong values, since your algorithm is based on assumptions and not reality. If you are trying to calculate the time taken (or will be taken) to copy some data from one place to the other, then you need to sample the time stamps after each block or set of blocks and adjust your values according to what time has been taken. Using an arbitrary value of .298 is totally meaningless.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys types.h="">
#include <sys\stat.h>
#include "windows.h"
#include "global.h"
#include "wiper.c"
int totalfiles=0;
int p;
int q;
long a;
char stop_wiping = 0;
//double dif;
LARGE_INTEGER start;
LARGE_INTEGER start1;
double nRemaining;
double nTotalTime;
double nElapsed;
double nPercentage;
double nRemaining1;
double nTotalTime1;
double nElapsed1;
double nPercentage1;
void TimerStart(LARGE_INTEGER *pSpec) {
QueryPerformanceCounter(pSpec);
}

double TimerQuery(LARGE_INTEGER *pSpec) {
LARGE_INTEGER li, liFreq;
QueryPerformanceCounter(&li);
QueryPerformanceFrequency(&liFreq); //If you want to optimise, do this once and save the result
return (li.QuadPart - pSpec->QuadPart) / (double)liFreq.QuadPart;
}


void usage()
{
fprintf(stdout, "\n%s - %s\nUsage: %s DRIVE_PATH\n", PROGRAM_NAME, PROGRAM_VER, PROGRAM_NAME);
}


int get_opts(int argc, char *argv[], char drive_path[256])
{
int i, p;
char ch;

if (argc != 2){
usage();
return -1;
}
strcpy(drive_path, argv[1]);

p = strlen(drive_path) - 1;
//remove final slash if exists
if (drive_path[p] == '/' || drive_path[p]=='\\')
{
drive_path[p] = '\0';
}

return 0;
}


int can_write(char * drive_path){

unsigned char filepath[256];
int r = 0;

sprintf(filepath, "%s/%s", drive_path, TEST_FILENAME);
FILE * f = fopen(filepath, "w+b");

if (f == NULL){
r = -1;
goto exit;
}

if (fputs(filepath, f) < 0){
r = -1;
goto exit;
}

exit:
if (f != NULL){
fclose(f);
if (remove(filepath) != 0){
r = -1;
}
}

return r;
}
/////////////////////////////////////
#if (OS == 1)
long abort_listener(){
getchar();
stop_wiping = 1;
return 0;
}
#else
void * abort_listener(void * args){
getchar();
stop_wiping = 1;
return 0;
}
#endif


void clear_console_screen()
{
#if (OS == 1)
system("CLS");
#else
system("clear");
#endif
}
void wipe_status1(long file_num, long gap)
{
// clear_console_screen();
q=a/20;
// printf(" file no :%d",q);
fprintf(stdout, "%s - %s\n\nStatus: Deleting process in progress [Don't Press ENTER to stop]", PROGRAM_NAME, PROGRAM_VER);
printf("\n%2.1f%% complete, Estimated %f seconds remaining\n", (nPercentage1 ), nRemaining1);
// printf("Total execution time: %f min\n", (TimerQuery(&start1)/60));
fflush(stdout);
}
void delete_tmp_files(char * drive_path, long file_num)
{
unsigned char filepath[256];
long i;
time_t now_t1, start_t1;
time(&start_t1);
wipe_status1(0L, 0L);
fprintf(stdout, "\nStatus: Deleting temporary files.\n");

for(i=1; i<=file_num; i++){
sprintf(filepath, "%s/%s%ld", drive_path, FILE_PREFIX, i);
long b;
b=a/20;
nPercentage1 = (file_num *100.0)/ b;
// printf("\n file no :%d",p);
nElapsed1 = TimerQuery(&start1); //In seconds
nTotalTime1 = (100.0 / nPercentage1) * nElapsed1;
nRemaining1 = nTotalTime1 - nElapsed1;
if (remove(filepath) != 0){
fprintf(stdout, "\nError: Unable to remove temporary files.");
break;
}
}
}


void wipe_status(char * drive_path,long file_num, long gap)
{
clear_console_screen();
// printf("%d",a);
p=a/20;

// printf ("\n111It total time=%.2lf seconds.\n", p*dif );
fprintf(stdout, "%s - %s\n\nStatus: Wiping free space in progress [Press ENTER to stop]", PROGRAM_NAME, PROGRAM_VER);
fprintf(stdout, "\nNote: Don't stop with CTRL+C otherwise the temporary files will not be deleted");
fprintf(stdout, "\nInfo: %ld Mb written in %5.2f min\n", (long) ((long)file_num)*((long)DEFAULT_FILE_SIZE), ((float)gap/60));
// printf("\n Total Time:%5.2f min\n",(float)p*(.0

thanks ...............