Math problem in C

Code:

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for(x=1;x<=day;x++){
age=99(log((max(x,hieght)+a)/7);
}

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that is my code ....and here is what i am trying to do


computing a luck factor, as this is the formula
99(log(max(the sumation of x=1 as it reaches day)x,hieght)+a/7;

now thats probably confusing, so basically its asking for the max of when x reaches a specific of either x or hieght i take it.

Either way my code is faulty, that for loop just wont complie right, any help would be great

In C, you can't just stick numbers next to each other for them to be multiplied like you do in algebra.

This: na
Is not "n * a".

Likewise, "99(log....)" is not "99 * (log...)", if that is what you're actually trying to do.


Quzah.

yea, just starting C....use to java where i can do that ............i put in the opertands like *, but still get like invalid operations

Assuming that max() is a function or a macro that takes two arguments .....

Code:

---

for(x=1;x<=day;x++){
age=99*(log((max(x,hieght)+a)/7);
}

---

One thing to watch is that log() is a math function which takes a double as argument. If all of your variables are of integral type you would need to convert something to double to allow it to work. For example;
[code]

Code:

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/* provide an macro that implements max() for discussions sake */
#define max(a,b) ((a)<(b) ? (b) : (a))

int x, age, hieght, a;
for(x=1;x<=day;x++){
age=(int)(99*(log((max(x,hieght)+(double)a)/7));
}

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Quote:

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Originally Posted by airj56

yea, just starting C....use to java where i can do that ............

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Java doesn't allow that either, except in regular expressions (which are strings that are worked on by a library function).

alright, well i dont want to sound like an idiot, but like u said something about that max function, i have to define it or something? THats my only other error

It helps if you actually post the errors and warnings you're getting. If you're getting an 'undefined reference to max', then you'll need to either create a macro for it, as shown above, or make a function for it. In other words, before you use something, your compiler has to know what it is.


Quzah.

thanks for all ur replys