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subject: Do you want to learn to program in C

357 replies on 24 pages. most recent reply: Tues, Aug 28 10:58 PM by matthew102000

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mmaarrkkuuss

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Re: Do you want to learn to program in C   posted: 23-Mar-07 17:54   »»

STDP

I can't make this work:P I've debugged it but I can't fix it:P

#include<stdio.h>

int main (void)

{
int masses, count;
float distance, current_loc;
char name[15];
FILE *fp;

printf("Name of new file: ");
scanf("%s", name);

fp = fopen( name, "w");

do
{
printf("Number of masses: ");
scanf("%d", &masses);
} while ( masses <=1);

do
{
printf("Distance between masses: ");
scanf("%f", &distance);
} while ( distance < 10);

for ( count = 0; count < masses; count++)
{
fprintf( fp,"<mass id=\"m%d\" x=\"%f\" y=\"10.0\" vx=\"0.0\" vy=\"0.0\" />\n",count,current_loc);

current_loc = current loc + distance;
}

for ( count = 0; count < masses - 1; count++)
{
frintf(fp,"<spring a=\"m%d\" b=\" m%d\" restlenght=\"%f\" />\n",count, count+1,distance);
}
fclose(fp);

printf("File successfully created. ");

scanf("%c");

return 0;
}

I would be glad if you would help:)

~mmaarrkkuuss~

cactus1

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Re: Do you want to learn to program in C   posted: 23-Mar-07 18:03   »»

#include<stdio.h>

int main (void)

{
int masses, count;
float distance, current_loc;
char name[15];
FILE *fp;

printf("Name of new file: ");
scanf("%s", name);

fp = fopen( name, "w");

do
{
printf("Number of masses: ");
scanf("%d", &masses);
} while ( masses <=1);

do
{
printf("Distance between masses: ");
scanf("%f", &distance);
} while ( distance < 10);

for ( count = 0; count < masses; count++)
{
fprintf( fp,"<mass id=\"m%d\" x=\"%f\" y=\"10.0\" vx=\"0.0\" vy=\"0.0\" />\n",count,current_loc);

current_loc = current loc + distance;
}

for ( count = 0; count < masses; count++)
{
fprintf(fp,"<spring a=\"m%d\" b=\" m%d\" restlength=\"%f\" />\n",count, count+1,distance);
}
fclose(fp);

printf("File successfully created. ");

scanf("%c");

return 0;
}

cactus1

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Re: Do you want to learn to program in C   posted: 23-Mar-07 18:05   »»

stdp. Messed up on one detail

#include<stdio.h>

int main (void)

{
int masses, count;
float distance, current_loc;
char name[15];
FILE *fp;

printf("Name of new file: ");
scanf("%s", name);

fp = fopen( name, "w");

do
{
printf("Number of masses: ");
scanf("%d", &masses);
} while ( masses <=1);

do
{
printf("Distance between masses: ");
scanf("%f", &distance);
} while ( distance < 10);

for ( count = 0; count < masses; count++)
{
fprintf( fp,"<mass id=\"m%d\" x=\"%f\" y=\"10.0\" vx=\"0.0\" vy=\"0.0\" />\n",count,current_loc);

current_loc = current loc + distance;
}

for ( count = 0; count < masses-1; count++)
{
fprintf(fp,"<spring a=\"m%d\" b=\" m%d\" restlength=\"%f\" />\n",count, count+1,distance);
}
fclose(fp);

printf("File successfully created. ");

scanf("%c");

return 0;
}

mmaarrkkuuss

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Re: Do you want to learn to program in C   posted: 23-Mar-07 18:11   »»

Thanks! But it still says that there's something wrong with "while ( distance < 10);" at line 26 :/

~mmaarrkkuuss~

cactus1

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Re: Do you want to learn to program in C   posted: 23-Mar-07 20:06   »»

Test it now.

#include<stdio.h>

int main (void)

{
int masses, count;
float distance, current_loc;
char name[15];
FILE *fp;

printf("Name of new file: ");
scanf("%s", name);

fp = fopen( name, "w");

do
{
printf("Number of masses: ");
scanf("%d", &masses);
} while ( masses <=1);

do
{
printf("Distance between masses: ");
scanf("%f", &distance);
} while ( distance < (float)10);

for ( count = 0; count < masses; count++)
{
fprintf( fp,"<mass id=\"m%d\" x=\"%f\" y=\"10.0\" vx=\"0.0\" vy=\"0.0\" />\n",count,current_loc);

current_loc = current loc + distance;
}

for ( count = 0; count < masses-1; count++)
{
fprintf(fp,"<spring a=\"m%d\" b=\" m%d\" restlength=\"%f\" />\n",count, count+1,distance);
}
fclose(fp);

printf("File successfully created. ");

scanf("%c");

return 0;
}

mmaarrkkuuss

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Re: Do you want to learn to program in C   posted: 23-Mar-07 20:39   »»

Thanks! Now it has no bugs, but when I create a file and upload it to the constructor, it is empty :'( Sorry if this is a little annoying:P

~mmaarrkkuuss~

cactus1

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Re: Do you want to learn to program in C   posted: 24-Mar-07 01:25   »»

That's because you don't have all the stuff there. You forgot the environment tags as well as <nodes> and <links>.

matthew102000

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Re: Do you want to learn to program in C   posted: 24-Mar-07 01:53   »»

i found out something cool. if you want to tab over your text (printf(text)) to make it mote organized, use \t. it works like the \n function, but instead of making a new line, it tabs over the text.

matt wuz here.

oh. ps, i still dont get how to make files with the c program. dail, please help me. whatever i do, it ends up wrong. and also, i dont get how to make things equil oyher things, so later i can type something, and whatever the yser imput is will be put there. like i said. please help.

matt wuz here again.

matthew102000

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Re: Do you want to learn to program in C   posted: 24-Mar-07 01:55   »»

sorry for my bad spelling on that last post.

matt wuz here

matthew102000

»» models

Re: Do you want to learn to program in C   posted: 24-Mar-07 02:06   »»

dail, i just read your 2nd edition post. i would lile it. even thogh im still struggleing to understand the first one, i have the conceps down, i just nees the punctuation and stuff down. i know why they work, but im bad at making them work, if you know what im saying. anyway, im interested.

matt wuz here

cactus1

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Re: Do you want to learn to program in C   posted: 24-Mar-07 11:46   »»

To make things equal, you have to cast them. For example:
int a=0;
float q;
q=(float)a;

Converts variable a into a floating point variable and stores it in q.

cactus1

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Re: Do you want to learn to program in C   posted: 24-Mar-07 11:47   »»

stdp

For osme things, it is generally not suggested to cast. For example, you probably don't want to cast an integer into a character.

mmaarrkkuuss

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Re: Do you want to learn to program in C   posted: 24-Mar-07 13:21   »»

I have tried to place in the other stuff in the code but it did not work:( It has no bugs, it's just that when I try to import the file sodaconstructor stops working:P

#include<stdio.h>

int main (void)

{
int masses, count;
float distance, current_loc;
char name[15];
FILE *fp;

printf("Name of new file: ");
scanf("%s", name);

fp = fopen( name, "w");

do
{
printf("Number of masses: ");
scanf("%d", &masses);
} while ( masses <=1);

do
{
printf("Distance between masses: ");
scanf("%f", &distance);
} while ( distance < (float)10);

fprintf( fp, "<\?xml version=\"1.0\" encoding=\"ISO-8859-1\" standalone=\"no\"\?> \n"
"<!DOCTYPE sodaconstructor>\n"
"<model>\n"
"\t<comment></comment>\n"
"\t<container width=\"651\" height=\"422\" />\n"
"\t<environment gravity=\"0.25469473\" friction=\"0.042274434\" springyness=\"0.3537427\" />\n"
"\t<collisions surface_friction=\"0.1\" surface_reflection=\"-0.75\" />\n"
"\t<wave amplitude=\"0.76744187\" phase=\"0.67803925\" speed=\"0.014117647\" />\n"
"\t<settings gravitydirection=\"down\" wavedirection=\"reverse\" autoreverse=\"on\" />\n"
"<nodes>\n");

for ( count = 0; count < masses; count++)
{

fprintf( fp,"<mass id=\"m%d\" x=\"%f\" y=\"10.0\" vx=\"0.0\" vy=\"0.0\" />\n",count,current_loc);

current_loc = current_loc + distance;
}

fprintf( fp, "</nodes>\n");
fprintf( fp, "\t<links>\n");

for ( count = 0; count < masses-1; count++)
{

fprintf(fp,"<spring a=\"m%d\" b=\" m%d\" restlength=\"%f\" />\n",count, count+1,distance);
}

fputs("\t</links>\n", fp);
fputs("\t</model>\n", fp);

fclose(fp);

printf("File successfully created. ");

scanf("%c");

return 0;
}

I'm getting better:\ Thanks for the help:)

~mmaarrkkuuss~

matthew102000

»» models

Re: Do you want to learn to program in C   posted: 24-Mar-07 22:33   »»

cactus1, i think what i ment to say was when the user imputs something, i cant figure out how to put that in the file that is created. how would i go about doing so? please help.

matt wuz here

cactus1

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Re: Do you want to learn to program in C   posted: 25-Mar-07 12:40   »»

You use fputs and fprintf, after opening the file. You might be able to use a different mode setting other than "w", such as "a", the keep the original contents and just add to the end of the file.

Also, here is a good C++ reference site.
http://www.cplusplus.com/fopen

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