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SirDeity

Simple C Program

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Hello. I'm reading C Primer Plus while trying to learn the C programming language. I've only been at it for about a week. I'm having trouble figuring out how to create a simple converter. I'm trying to make the program start by telling the user to enter the amount of fathoms he wishes to convert into feet. After the user enters a number, I want the program to respond with something like, "There are __ feet in __ fathoms." There are probably many ways of doing this, but I want to know if it's possible using only the functions I've been practicing. If you would be so kind, please give me a list of possible C source codes for such a program. Try to make it as similar to my own as possible, except make sure yours works. =) Here's a paste of my flawed source code: http://rafb.net/paste/results/As660589.html Thanks, again. [edited by - SirDeity on October 11, 2003 10:36:27 PM]

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

int main( int argc, char *argv[] ){

int fathoms;
printf("Enter the number of fathoms you'd like to convert into feet.\n");
scanf("%d", &fathoms);
printf("There are %d feet in %d fathoms!\n", fathoms*6, fathoms);

return 0;
}

sorry if the C sintax isnt very good, long time being using C++ only.
the problem with your function is that your tried to multiply by 6 before you had the fathoms.

int x = x*6; //very wrong

hope it helps.

[edited by - a2ps on October 11, 2003 10:51:09 PM]

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#include <stdio.h>
#include <stdlib.h>
main(void)
{
int feet, fathoms;

printf("Enter the number of fathoms you''d like to convert into feet.\n");
scanf("%d", &fathoms); // You must first read the amount of fathoms
feet = fathoms * 6; //Then you do the conversion
printf("There are %d feet in %d fathoms!\n", feet, fathoms);
getchar();
getchar();
return 0;
}

You had an error in line 8 "fathoms = fathoms*feet;" because you were multiplying a variable, fathoms, with no inicial value.

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Move the fathoms=fathmos*feet line below the scanf line - (and before the printing results line) should work then...

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Guest Anonymous Poster
hehe, 3 reply''s and all telling the same.

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Those were some fast respones. Thank you all!

Dr_BCC, perfect response. It was better than I had hoped for. Thank you very much! Now I completely understand my mistake.

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I''m having another similar problem. I''ve been trying to make this work for over two hours. The book hasn''t covered assigning words or sentences to variables. I only know how to assign numbers. Using the same code, or using as little new code as possible, how can you make this work?

Assignment: Write a program that produces the following output:

For he''s a jolly good fellow!
For he''s a jolly good fellow!
For he''s a jolly good fellow!
Which nobody can deny!

Instructions: Have the program use two user-defined functions in addition to main(): one that prints the jolly good message once, and one that prints the final line once.


This time, I don''t think I''m anywhere near being close. The best response would be one similar to Dr_BCC''s previous one. Here''s a paste of my flawed source code. I''ll include a couple different failed attempts so you can guess what my intentions were.

http://rafb.net/paste/results/x2992340.html

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Just the relevant portions of the code:

void Jolly ( void )
{
printf ( "For he''s a jolly good fellow,\n" );
}

void Deny ( void )
{
printf ( "Which nobody can deny.\n" );
}

int main ( void )
{
for ( int a = 0; a < 3; a++ )
Jolly ();

Deny ();

return 0;
}

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That''s C I haven''t learned yet; the book hasn''t covered it. Are there any other ways of creating this program?

These lines haven''t been discussed in the book yet:

for ( int a = 0; a < 3; a++ )
// I haven''t yet learned how to use the "for" keyword.

Jolly ();
// I haven''t learned how to use the void word(void) functions yet. The only voids used so far are main and butler. I haven''t seen any examples of the word(); function being used.

Deny ();
// Same as the above statement/function.




Thanks! =)

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Without knowing the for loop, you could just do

Jolly();
Jolly();
Jolly();





------------------------------------------------------------
// TODO: Insert clever comment here.

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