A program to convert miles to kilometres

Persian_Devil13 · #1 29-Jan-2006, 19:43

Im a noob trying to learn C by making simple programs as i go and need help, i cant get a program to convert miles to kms that i made to work because it asks for a number of miles to convert, but then i dont know how to get it to actually convert and another one real simple, just opens a box and prints out Hello, but for some reason that box lasts less then a second, how can i get these to work out? (the mile-km converter closes wen i press enter)

Paramesh · #2 29-Jan-2006, 19:51

Hi Persian,

Welcome to the GIDForums.

Which compiler do you use?

Do you use an IDE?
If so, you must pause the program for a while, so that you can see the output.
Please take a look here:
Pausing a program

Please read the Guidelines too.

Regards,

Paramesh.

Persian_Devil13 · #3 29-Jan-2006, 19:58

I just looked thru the link u gave, and i tried the 3 different options it gives u, finding getchar();the best but now the window opens and no words come up?

this is the code

CPP / C++ / C Code:

 #include <stdio.h>
 int
 main(void)
 {
  getchar();
  printf("Hello\n");
  return (0);
 }

Persian_Devil13 · #4 29-Jan-2006, 20:00

"P wait the guidlines say to do this so

CPP / C++ / C Code:

 #include <stdio.h>
 int
 main(void)
 {
  getchar();
  printf("Hello\n");
  return (0);
 }

Paramesh · #5 29-Jan-2006, 20:07

Put the getchar before return 0;

CPP / C++ / C Code:

#include <stdio.h>
int main(void)
{
    printf("Hello\n");
    
    getchar();
    return 0;
}

Because you have to wait before quitting the program.
Always put your pause functions before return 0;

Insert your code between [c] and [/c] tags.

Regards,

Paramesh.

Persian_Devil13 · #6 29-Jan-2006, 20:15

thx, it works now

,
btw with these commands, is there a method of know wat order commands like that go in, like where to put them?

Paramesh · #7 29-Jan-2006, 20:23

Quote:

Originally Posted by Persian

btw with these commands, is there a method of know wat order commands like that go in, like where to put them?

According to the need!

If you want to pause the program before the end of the program, put it before return 0;

For example, consider this code:

CPP / C++ / C Code:

#include <stdio.h>
int main(void)
{
    printf("Hello ");
    getchar();

    printf("World");
    getchar();
    return 0;
}

Did you understand how this works?

Regards,

Paramesh.

Persian_Devil13 · #8 29-Jan-2006, 20:24

kk, thx alot

Persian_Devil13 · #9 29-Jan-2006, 20:39

U woodnt happen to know what to do about a kilometre-mile converter that asks for a number in miles but closes wen u give it a number and press enter, i dont get how it to work so that it actualy converts

Paramesh · #10 29-Jan-2006, 20:54

You would've done an illegal operation.
For example, if you give a character as input when you need integer, the program would quit.
If you divide a number by 0, the program would quit.

Please post your code, so that we'll be able to find out what is the error.

There is also another source for error.
The scanf function!

If you use scanf, it will lead to a lot of errors. It will put the extra characters in the stdin buffer, and one getchar wont work.
You can look at the C/C++ tutorial subforum to find a lot of tutorial on scanf.

When you use scanf, put getchar after that scanf, and this will work.
There are also other methods.

For example, like this:

CPP / C++ / C Code:

#include <stdio.h>
int main(void)
{
    float km, miles;
    scanf("%f", &km);
    getchar();

    miles = 1.609344 * km;
    printf("km = %f miles = %f", km, miles);
    getchar();
    return 0;
}

Regards,

Paramesh.

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A program to convert miles to kilometres

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