[jeff544]

I'm trying to make a function than will generate a random number. So I made this:

random(int number){
	number = rand() % 1 + 9;
}

Then, later in the program, I use this:

firsts[10] = random(ran[4]);

But whenever I run the program, firsts[10] always equals 9.
Please help.

This post has been edited by jeff544: 13 August 2009 - 02:35 PM

[wildgoose]

You need to learn to write functions first

// return a random number between 0...9
int random() 
{
	return rand() % 10;
}

And explain your problem better.

What's ran[4] suppose to be?

This post has been edited by wildgoose: 13 August 2009 - 02:39 PM

[no2pencil]

It will be much easier to help you if you can provide the full code (at least to the usage of the function) because as wildgoose pointed out, you have syntax errors in the code you provided.

[jeff544]

no2pencil, on 13 Aug, 2009 - 01:42 PM, said:

It will be much easier to help you if you can provide the full code (at least to the usage of the function) because as wildgoose pointed out, you have syntax errors in the code you provided.

Uh.. actually I realized I messed up a lot on the code... but I fixed it.
Now the code for assigning a random number is:

firsts[10] = rand() % 10

But I always get 9 still...
Why is that?

[wildgoose]

Seeding.
Stick

srand(time(NULL));

at the top of your program.

Can you show your declaration for firsts[] ?

This post has been edited by wildgoose: 13 August 2009 - 03:00 PM

[jeff544]

wildgoose, on 13 Aug, 2009 - 01:59 PM, said:

Seeding.
Stick

srand(time(NULL));

at the top of your program.

Can you show your declaration for firsts[] ?

When I put that in my program, I got these errors:
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2143: syntax error : missing ')' before '('
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2143: syntax error : missing ')' before '('
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2091: function returns function
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2143: syntax error : missing ')' before '('
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2091: function returns function
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2091: function returns function
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2143: syntax error : missing '{' before 'constant'
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2059: syntax error : '<Unknown>'
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2059: syntax error : ')'
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2059: syntax error : ')'
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(4) : error C2059: syntax error : ')'



And here is the declaration for firsts[]:

int firsts[16];

[jeff544]

Help please?

[jeff544]

I'm new to programming, and I was just wondering how I could generate a random number between 1 and 10.

[PsychoCoder]

I can give you a nudge in the right direction, take a look at this and read through it

[rules][/rules]

[PsychoCoder]

Topics merged, please don't create duplicates

[jeff544]

PsychoCoder, on 13 Aug, 2009 - 03:15 PM, said:

I can give you a nudge in the right direction, take a look at this and read through it

[rules][/rules]

I tried to use it, but its really confusing(since I'm just a beginner).
I tried to use the function that he used with #include <stdlib>:

int gen_rand(void)
/* returns random number in range of 0 to 99 */
{
   int n;
   n=random(10);  /* n is random number in range of 0 - 99 */
   return(n);
}

but I get the error:
1>c:\users\jeff\documents\visual studio 2008\projects\cgen2\cgen2\cgen2.c(12) : warning C4013: 'random' undefined; assuming extern returning int
and:
1>cgen2.obj : error LNK2019: unresolved external symbol _random referenced in function _gen_rand

[jjl]

#include <ctime>
int gen_rand(void)
/* returns random number in range of 0 to 99 */
{
   srand(unsigned(time(0)));
   int n;
   n=rand()%100/* n is random number in range of 0 - 99 */
   return(n);
}

[jeff544]

ImaSexy, on 13 Aug, 2009 - 04:15 PM, said:

#include <ctime>
int gen_rand(void)
/* returns random number in range of 0 to 99 */
{
   srand(unsigned(time(0)));
   int n;
   n=rand()%100/* n is random number in range of 0 - 99 */
   return(n);
}

That doesn't work.