Graphs in C?

Ok a friend of mine is studying his masters in Elec Engineering. he's been handed an assignment to plot some graphs (sine/square/sawtooth etc)
Hes been tasked with coding it in C and run that on a HCS12(x) microcontroller.

Now he knows absoloutly nothing about programming outside of some hardware specific asm code and asked me to help him.

I said sure and ive now realised that i have no fucking clue how to output as a graph. i was hoping to make a function that handled the output to the console (ive got none of the specific hardware or tools hes using) then allow him to write up his own function to run the output on his hardware using whatever fucking libraries codewarrior needs.

so using a standard compiler on standard x86 hardware, how the hell do i output a graph to a console or window? anyone know of any libraries i should look into to handle graphics?

I thought you meant graphics in C.
GRAPHS?! fucking hell, go read K&R2. There's an exercise on graphs in the first chapters.

>>2
K&R second edition?

>>3
No, the sequel.

>>4
THERES A FUCKING SEQUEL???????
FFFFFFFFFFFFFFFFFFFFFfffffffffffffffff.

PS: is it actualy a usefull read? im more reliant on c++, will 2 help me reach satori?

K&R2
2
Please elaborate.

It doesn't strike you that it could be the second edition?

>>7
>>3
apparently no one considered this.

>>2 here, yes you fucking morons, the second edition that describes ANSI C.

>>9
YHBTCBFP

>>10
Whatever, you faggot.
I've been here 3 years, I know when someone is trolling and when someone is being stupid.
in this case, they tried to troll, but ended up being plain stupid.

make a matrix, A, m x n initialized to 0

iterate over columns:

    map the j to an x value
    compute f(x)
    map f(x) to i value
    Aij = 1

#include <stdio.h>
#include <math.h>

void graph(double (*f)(double), double xmin, double xmax, double ymin, double ymax, int rows, int cols)
{
    int r;
    for (r=0; r<rows; r++)
    {
        double x = (xmax-xmin) * r/rows + xmin;
        int c = (f(x)-ymin) / (ymax-ymin) * cols;
        if (c > cols)
            c = cols;
        else if (c < 0)
            c = 0;
        while (c--)
            putchar('*');
        putchar('\n');
    }
}

int main()
{
    graph(sin, 0, 10, -2, 2, 40, 40);
    return 0;
}

>>11
3 years? You parents hide you in the basement and only let you out after midnight?

>>13
11       int c = (f(x)-ymin) / (ymax-ymin) * cols;

[Warning] converting to `int' from `double'

-----
Try this:

[b]int[/b] c = lround((f(x)-ymin) / (ymax-ymin) * cols);

DONT HELP HIM