Thread: Help writing a C code for pulling information out of files

Hello, I am new here entirely, and I am new to C programming, I have to write a program, that uses a "while loop" and "for loop" my teacher gave me two lines of code that had to be used in order to extract the data out of three files he gave us the name for. I need help getting started on that part, I can do the rest of the math stuff on my own, I am having troubles getting started on the code that will pull out the numbers from a file and making them useable in the code.

Code:

//get the file name
    while (fscanf(infile, "%d", &number) ==1)
        for (i=0; i < number; i++);

that is the two lines he gave us, and I don't understand what they do exactly that much. Any help is very much appreciated

Stuart

3
5 -4 0
5
1 -2 3 -4 5

they look like this. and i understand what the program is suppose to do, just not how to make it do that.

Ok, so this is what i have so far, and what i am suppose to do with this data is

• the total number of elements
• the summation of values
• the range of values (the lowest and highest)
• the mean value (to 3 places)
• the variance (to 3 places), and
• the standard deviation (to 3 places).

Code:

#include <stdio.h>
#include <stdlib.h>
#pragma warning(disable: 4996)
#define MAX 25
//----------------------------------------------------------------------------


int highest = 0;
int lowest = 0;
int mean = 0;


FILE *infile = NULL;
FILE *outfile = NULL;
int number = 0;
int i = 0;
char filename [MAX];
char outfilename [MAX];


int main(void)
{
//get the file name
	printf ("Please enter the file name. \n");
	scanf ("%s", &filename);
	infile=fopen(filename,"r");


	while (fscanf(infile, "%d", &number) ==1)
		for (i=0; i < number; i++);
}

Hey, I am still looking for help on this <bump>

ok, so i am working on this with a friend, and we are currently looking on how to track the ranges of the programs, we have the program working through the file and getting the correct value for the datas and i am lost as to how to find the lowest number and the highest number. any ideas? if need be i can post my latest version of the code. thank you so much for your help so far.