Any C programming super geeks out there?

[eetaylog]

im writing an if-else loop that calls on float values x, y and z but need to include an if statement that says:

 

if(x y and z are all equal in value, then)...

 

else...

 

im not really sure about how to construct the if(..) statement though, would it be if(x=y=z)?

[Stu]

if(a==1 && b==1 && c=1) { do something } else { do something else } Edited November 20, 2009 by Stu

[eetaylog]

if(a==1 && b==1 && c=1) { do something } else { do something else }

 

of course, bleedin obvious now youve pointed it out!

 

cheers stu.

[stoo2000]

if(a==1 && b==1 && c==1) { do something } else { do something else }

 

You missed a bit

[eetaylog]

if(a==1 && b==1 && c=1) { do something } else { do something else }

 

hang on a minute, ive just looked at your answer again and i dont think its exactly what im looking for, what i need is a statement that says

 

if(x,y and z are all the same value)

 

{function}

 

else

 

{function}

 

what yours says is:

 

if(x=1 and b=1 and c=1)

 

{function}

 

else

 

{function}

 

or am i missing something?

Edited November 20, 2009 by eetaylog

[Stu]

if(a==1 && b==1 && c==1) { do something } else { do something else }

 

You missed a bit

 

I missed a lot, but the essence is there. I'd expect people understand the use of semi-colons if they're writing C!

 

if(a==1 && b==1 && c=1) { do something } else { do something else }

 

hang on a minute, ive just looked at your answer again and i dont think its exactly what im looking for, what i need is a statement that says

 

if(x,y and z are all the same value)

 

{function}

 

else

 

{function}

 

what yours says is:

 

if(x=1 and b=1 and c=1)

 

{function}

 

else

 

{function}

 

or am i missing something?

 

 

I think you must be missing something.

[eetaylog]

ok, so if i use the program below (some of the maths is missing but youll get the idea) with your if statement, then if x,y and z are equal (for any value, i.e x,y and z = 5 or x,y,z = 10) i will get OUTPUT1, otherwise ill get OUTPUT2. correct?

 

main()

 

{

 

float a1, float a2 float b1, floatb2, float c1 float c2, float x, float y, float z;

 

printf("please enter values a1,b1 and c1\n");

scanf(%f%f%f,a1,b1,c1);

 

printf("please enter values a2,b2 and c2\n");

scanf(%f%f%f,a2,b2,c2);

 

x = a2/a1;

 

y = b2/b1;

 

z = c2/c1;

 

if(a==1 && b==1 && c=1)

 

{

printf("OUTPUT1\n");

}

 

else

 

{

printf("OUTPUT2\n");

}

 

}

Edited November 20, 2009 by eetaylog

[Stu]

No..

 

You'd need to have something like

 

matchvar = 1;

 

if (x == matchvar && y == matchvar && z == matchvar) {

 

do something;

 

} else {

 

do something else;

 

};

[eetaylog]

No..

 

You'd need to have something like

 

matchvar = 1;

 

if (x == matchvar && y == matchvar && z == matchvar) {

 

do something;

 

} else {

 

do something else;

 

};

 

right, i thought so, that makes more sense. ill have a play around..

[Stu]

Why don't you tell me what you're trying to achieve, logically, as i'm not convinced this is the best way to go (for anything) ?

[eetaylog]

fyi, ive done it this way now. seems to work:

 

x = a2/a1;

y = b2/b1;

z = c2/c1;

 

test = (x+y+z)/3;

 

if(test=x)

...

 

else

...

Edited November 20, 2009 by eetaylog

[Stu]

There are many ways to skin a cat.. but not many ways to correctly architect a piece of software!

[bluliz]

fyi, ive done it this way now. seems to work:

 

x = a2/a1;

y = b2/b1;

z = c2/c1;

 

test = (x+y+z)/3;

 

if(test=x)

...

 

else

...

 

But what if

 

X=5

Y=6

Z=4

 

test = (5+6+4)/3;

If(5=5)

 

But X was not the same as Y or Z...

 

Maybe you want to compare X to Y if true then compare X to Z

Edited November 20, 2009 by bluliz

[eetaylog]

But what if

 

X=5

Y=6

Z=4

 

test = (5+6+4)/3;

If(5=5)

 

But X was not the same as Y or Z...

 

Maybe you want to compare X to Y if true then compare X to Z

 

<3

 

i know what youre saying, i spotted this earlier as well. eg,

 

x=5

y=7

z=3

 

would slip through the net so to speak.

 

i think ive got around it now though by using

 

x = a2/a1;

y = b2/b1;

z = c2/c1;

 

test1 = x/y;

test2 = y/z;

 

if(test1&&test2=1)

...

 

else

...

 

i will have to wait til monday to test it on a DSP now though.

 

@stu.. im writing a program that solves simultaneous equations, ie, the solutions to

 

a1x + b1y = c1

a2x + b2y = c2

 

ive got most of the program wrapped up, just couldnt get the if-else loop bit right. ill stick my full program on here later on if youre interested.

Edited November 20, 2009 by eetaylog

[stoo2000]

surely in your If statement you need == not just = otherwise you are assigning the value (1) to test2, so it's always going to be true.

 

what about...

 

if( a==b && b==c ){...