C/C++ Calculating Triangle Area Using C++ Programming

[ineedhelpnow]

i didnt see a document but I am pretty sure I am doing the cout statements correctly. buuuuuuuut anyways I GOT IT I GOT IT I GOT IT I GOT IT! i needed a cin statement for the else command. thank u!

 

[MarkFL]

i didnt see a document but I am pretty sure I am doing the cout statements correctly. buuuuuuuut anyways I GOT IT I GOT IT I GOT IT I GOT IT! i needed a cin statement for the else command. thank u!

That was actually going to be my next suggestion...:D

Glad you got it working correctly! (Yes)

 

[ineedhelpnow]

That was actually going to be my next suggestion...:D

sure it was

#include <iostream>
#include <cmath>
using namespace std;

int main () {
     double a=0.0;
     double b=0.0;
     double c=0.0;
     double s=0.0;
     double r=0.0;
     double areaofTriangle=0.0;

a=1.0;
b=1.0;
c=3.0;
s=(a+b+c) / 2;
r=s*((s-a)*(s-b)*(s-c));

if (r>0) {
       areaofTriangle = sqrt(r);
       cout << "The area of a triangle with the three given sides " << a << ", " << b << ", " << c << " is " << areaofTriangle << "." << endl; 
       cin >> areaofTriangle;
}
else {
       cout << "Error." << endl;
       cin >> areaofTriangle;
}

return 0;
}

 

[ineedhelpnow]

i actually didnt meet one of the conditions. that two of the sides has to be greater than one of them. or something like that...

 

[MarkFL]

i actually didnt meet one of the conditions. that two of the sides has to be greater than one of them. or something like that...

The condition that [m]r[/m] must be positive is equivalent to satisfying the triangle inequality. :D

 

[ineedhelpnow]

(Shake) he failed me on the assignment because i missed that second condition. he's giving a second chance though. also in my program, i stored the variables a b and c which was wrong.

 

[MarkFL]

(Shake) he failed me on the assignment because i missed that second condition. he's giving a second chance though. also in my program, i stored the variables a b and c which was wrong.

If it were me, I would present to my professor an algebraic argument demonstrating that the positive value of [m]r[/m] is in fact equivalent to the triangle inequality.

 

[ineedhelpnow]

yeah i could present him with a present lol i don't think he would care. he told me that i had to satisfy both conditions. i don't understand why because the program would still run properly once i get rid of what i stored for a,b, and c but he said i have to put that second condition.

 

[MarkFL]

yeah i could present him with a present lol i don't think he would care. he told me that i had to satisfy both conditions. i don't understand why because the program would still run properly once i get rid of what i stored for a,b, and c but he said i have to put that second condition.

I would still make such an argument, but this is up to you. The way you have it coded now is much more efficient than having to determine which is the largest of the 3 values, and then make certain that the sum of the other two sides is greater than it. But, if in the end your professor is adamant and unmoved by a well-reasoned argument, you must do what you must do.

 

[ineedhelpnow]

he wants us to fulfill the second condition because he wants us to be able to code it properly. to have us use all the different types of commands and functions.

 

[MarkFL]

he wants us to fulfill the second condition because he wants us to be able to code it properly. to have us use all the different types of commands and functions.

You are fulfilling the triangle inequality, with one statement, but you know your professor better than I do, so do what you think is best. :D