mungkin masih sederhana sekali di banding senior2 heheheh
nih source codenya
#include <stdio.h>
#include <stdlib.h>
#define FALSE 0
#define TRUE 1
void main (void);
void add_to_file(char *filename);
void show_contents(char *filename);
void get_record(char *ptr_date,float *ptr_main_temp,float *ptr_max_temp, float *ptr_windspeed, float *ptr_rainfall);
void main(void)
{
char filename[01];
int choice;
while (choice !=3)
{
/* display list of choices */
printf("\n \n \t \t MAIN MENU");
printf("\n \t 1 - Create new file or add to existing file");
printf("\n \t 2 - List contents of an existing file");
printf("\n \t 3 - Exit program");
choice = 0;
/* get input */
while (choice < 1 || choice >3)
{
printf("\n \t Your choice (1,2 or 3) ?");
scanf("%d", &choice);
}
if (choice != 3 )
{
printf ("\n \t Enter filename : ");
scanf("%s", filename);
switch (choice)
{
case 1:
add_to_file(filename);
break;
case 2:
show_contents(filename);
break;
}
}
}
}
void add_to_file(char *filename)
{
FILE *file_ptr;
char date[21],buffer[01];
float min_temp,max_temp,windspeed,rainfall;
int exit_flag = FALSE;
/*open file*/
file_ptr = fopen(filename, "w+");
if (file_ptr == NULL)
{
printf ("\n Unable to open file %s", filename);
return;
}
//read and write records
while (!exit_flag)
{
get_record(date,&min_temp,&max_temp,&windspeed,&rainfall);
fprintf(file_ptr, "%s %f %f %f %f \n", date,min_temp,max_temp,windspeed,rainfall);
printf("\n Do uou want to enter more data - Y/N ? ");
scanf ("%s", buffer);
if (buffer [0] == 'N' || buffer [1] == 'n')
exit_flag = TRUE;
}
fclose(file_ptr);
}
void get_record(char *ptr_date, float *ptr_min_temp, float *ptr_max_temp, float *ptr_windspeed, float *ptr_rainfall)
{
printf ("\nEnter date of record : ");
scanf ("%s", ptr_date);
printf ("Enter minimum temperatur : ");
scanf ("%f", ptr_min_temp);
printf ("Enter maximum temperatur : ");
scanf ("%f", ptr_max_temp);
printf ("Enter maximum windspeed : ");
scanf ("%f", ptr_windspeed);
printf ("Enter total rainfall : ");
scanf("%f", ptr_rainfall);
}
void show_contents(char *filename)
{
FILE *file_ptr;
char date[21];
float min_temp,max_temp,windspeed,rainfall;
file_ptr = fopen(filename, "r");
if (file_ptr == NULL)
{
printf ("\n Unable to open file %s", filename);
return;
}
printf ("\n Date Min Temp Max Temp ");
printf ("Windspeed Rainfall");
/* read records from file and print */
while (!feof(file_ptr))
{
fscanf(file_ptr, "%s %f %f %f %f \n", date,&min_temp,&max_temp,&windspeed,&rainfall);
printf ("\n %s %f %f %f %f ", date,min_temp,max_temp,windspeed,rainfall);
}
/*close file*/
fclose(file_ptr);
}
The fread() function
The fread() function reads a block of bytes from a file. The function requires four arguments , as follows
fread(ptr, size, num, infile_ptr)
The fwrite() function
The fwrite() function writes a block of bytes to a file. The arguments to fwrite() are identical to those for fread()
fwrite(ptr, size, num, outfile_ptr)
output :
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