Gas Gadge

Hey everyone, i'm creating a program that requires the gas gadge to be updated everytime the speed changes. At the moment i'm manually entering the numbers, but later I will have the numbers being entered via txt file. Anyway, i'm having troubles getting the gas gadge to work, here is the code so far:

Code:

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/*Variables*/
//  FILE *numList;      //list of integers, manually enter numbers for now
  int i;                        //for loop variable;
  int temp;                //temp number
  float num;              //speed in %
 
//  numList = fopen("c:\\numList.txt","r");

  /*do loop*/
 // do{
 
    /*Prompt to enter number*/
    printf("Please enter the integer: ");
    scanf("%d", &temp);
   
    num = temp /64 * 100;
    printf("%.2f\n\n", num);
   
    num = 50;
    printf("\t|");
    for(i=0;i>=num;i++)
    {
      printf("-");
    }
    printf("|");
 

 // }while(num != -1);    /*exit do on '-1'*/
 
    getch();

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The main problem is that the inputed number isn't being converted into a percentage, and I have no idea why. I know this might seem like a n00b question, but I can't see the problem.

I want the gadge to loop something like the:
|------------------------ |


or something like that, the dashes will represent the speed. Also, If anyone has any other suggestions about how the gadge show look, I'm all ears.

Thanks;
S0n1C!

http://dictionary.reference.com/browse/gauge

Quote:

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Originally Posted by S0n1C

The main problem is that the inputed number isn't being converted into a percentage

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If you want to do floating point math, don't do integer math.

Code:

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num = temp /64 * 100;

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Yes, to get floating point number, put the temp variable into float data type.

And then, I think you should change the second expression within the for loop. I think it should be i <= 100, not i >= 100. Isn't it?

Then, one thing... why do you put 'num = 50;' over there?? I don't get it...

Anyway, keep trying!

Hey, i have 'num = 50' just for testing, because i couldn't get the percentage part to work. I just wanted to see if the gadge would work in the first place, ingnore that line of code, sorry forgot to document it out.

S0n1C!

This is going a little further than I should, but there's really not that much here besides what I've highlighted.

Code:

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

/**
 * Display a progress bar.
 * @param  value  the current value
 * @param  maxval  the maximum value
 */
void gauge(int value, int maxval)
{
  static const int scale = 50; /* adjust per your preference */
  double progress = (double)value / maxval;
  int i, current = progress * scale;
  /*
    * Print bar |-----+-------|
    */
  putchar('|');
  for ( i = 1; i < current; ++i )
  {
      putchar('-');
  }
  putchar('+');
  for ( ; i < scale - 1; ++i )
  {
      putchar('-');
  }
  putchar('|');
  /*
    * Print percentage.
    */
  printf(" %g%%", progress * 100.0);
}

int main()
{
  int i, top = 25;
  for ( i = 0; i < top; ++i )
  {
      time_t now = time(NULL);
      putchar('\r'); /* may work, may not */
      gauge(i, top);
      while ( time(NULL) == now ); /* ugly delay */
  }
  return 0;
}

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And 0% and 100% don't work the way you might expect. (I gotta leave something.)

Works great, thanks. I like the gauge, i'm now in the process of changing it. Making it look a little more graphical.

Thanks Again;
S0n1C!