the simplest problem of all (about fgets)

**white** · 11-02-2005

Well I am ashamed to say this ...but in all the time I am writing programs in C I always used data etc...directly from files. So I basically don't know how to put user input...I've checked some previous posts and tutorials but I can't really see what's wrong...the program works fine without the red part

Code:

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

int linesoffilex(FILE *estream)
{
	fseek(estream, 0, SEEK_SET);
	
	char mb[8];
	char* forpop = "%7s\n";
	
	int j=0;
	
	while (fscanf (estream, forpop, mb) == 1)
	{
		j++;
	}
	return j;
}
int main ()
{
	time_t timer;
	struct tm *tm_now;
	char filtime[BUFSIZ];
	char name[2];
	
	timer = time(NULL);
	tm_now = localtime (&timer);
	
	printf("press 1. to open a previous month or\n ANY key for current month\n");
	fgets(name, 1, stdin);
	
	if (name == "1")
	{
		printf("enter full file name\n");
		fgets(filtime, 12, stdin);
	}
	else
	{
		
		strftime (filtime , sizeof filtime, "%b %Y.txt", tm_now);
	}
	
	FILE *astream;
	astream = fopen(filtime, "a");
	fclose(astream);
	
	FILE *bstream;
	bstream = fopen(filtime, "r");
	int j, g, k;
	j = linesoffilex(bstream);
	
	double *kb;
	kb = malloc(sizeof(double)*j);
	
	fseek(bstream, 0, SEEK_SET);
	char * del = "%lf\n";
	
	for (g = 0; g < j; g++)
	{
		fscanf(bstream, del, &kb[g]);
	}
	
	double sum;
	
	for (k = 0; k < j; k++)
	{
		sum = kb[k]+sum;
	}
	fclose(bstream);
	
	FILE *cstream;
	cstream = fopen("statistics.txt", "w");
	fprintf(cstream, "Total kb so far: %lf\n",sum);
	fprintf(cstream, "Total kb remaining: %lf\n",3000-sum);
	fprintf(cstream, "Next day estimated usage: %lf\n",sum/j);
	fprintf(cstream, "Monthly estimated usage: %lf\n",(sum/j+1)*31);
	fprintf(cstream, "Daily recommented usage: %lf\n",(3000-sum)/(31-j));
	fclose(cstream);
	
	return 0;
}

What it does is that is exiting before the user inputs anything

**sand_man** · 11-02-2005

fgets is to input strings from a file stream.
You passed '1' to it as if you are looking for a single character? There are better functions for that.
Or do this

Code:

char name[10]; //make it bigger than 2, how can you fit a name in 2 characters?
fgets(name,sizeof(name),stdin);

Remember fgets does not throw out the new line character (it says in the string).
But if you looking to input a single character, look into fgetc/getc or getchar.

**white** · 11-02-2005

Code:

....
char name;
	char option[2];
	
	timer = time(NULL);
	tm_now = localtime (&timer);
	
	printf("press 1. to open a previous month or\n ANY key for current month\n");
	name = getchar();
	int char_count = 0;
	while( (name != '\n')  &&  (char_count < 2))
	{
		option[char_count] = name;
	}
....

well i've tried this as well but it still doesn't work.. i mean it doesn't go into the if..else statement

**xeddiex** · 11-02-2005

Code:

	char ch;

	printf("press 1. to open a previous month or\n ANY key for current month\n");
	ch = getchar();
	
	if ( ch == '1' )
	{
		// do something
	}

**ssharish2005** · 11-02-2005

Originally Posted by xeddiex

Code:

                int ch;

	printf("press 1. to open a previous month or\n ANY key for current month\n");
	ch = getchar();
	
	if ( ch == 1 )
	{
		// do something
	}

getchar returns an int not a char

ssharish2005

**dwks** · 11-02-2005

The int is so EOF can be detected. Once you've determined the EOF has not been reached, you can assign it to a char.

Thread: the simplest problem of all (about fgets)

Thread Tools

Search Thread

Display

the simplest problem of all (about fgets)

Similar Threads

Problem with fgets....

Words and lines count problem

problem with fgets

print problem while using fgets()

binary tree problem - help needed