Thread: bool functions

if i am using a bool function such as

Code:

bool isaMonkey(*)


int main ()
{
 
cout << isaMonkey(*) << endl;

returno
;

//
function parameters to determine isaMonkey...
furry skin, curly tail, eats bananas....

what is listed at ther astericks? true, false, both? The paramerters?

i am being told that my isaMonkey term doesn't evaluate to a function..
Thanks scuba22 (michele)
ps
isaMonkey is justanexample....but the question is a yes or no, which is why I am using bool.
Thx

thanks * thanks * thanks * for the quick reply
scuba22

actually my boolquestion is : isatriangle

so the sum of 2 sides must be greater than the third to be true


here's my fuction prototype:

Code:

bool isatriangle (double, double, double);

i start my main and get my data (numbers for 3 sides)
call my function:

Code:

cout<<setw(15) << s1 << s2 << s3 <<setw(15)<<isatriangle(s1, s2, s3)

and here's my function:

Code:

	//function isatriangle definition
			//x,y,z are parameters
			    bool isatrianle( double x, double y, double z){

				
				 bool iat = false;

				 if (y + z > x)
					iat = true;

				 if (x + z > y)
					iat = true;

				 if (x + y > z)
					iat = true;

				 return iat;

			}

but something is wrong and i'm getting this error:
unresolved external symbol "bool __cdecl isatriangle(double,double,double)" (?isatriangle@@YA_NNNN@Z)
Debug/HW_1018.exe : fatal error LNK1120: 1 unresolved externals

can you point out what's wrong?
scuba22

okay..thanks...duh.

one last question...

here's the new prototype & fuction,
why am I not getting a yes or no when i call the bool function?

actually what the hey..here's the entire thing...my output is a little messed up...

Code:

 
#include<iostream> 
#include<iomanip> 
#include<fstream> 
#include<cmath> 
#include<string>
using namespace std;


bool isatriangle (double, double, double);
double semiperimeter ( double, double, double );
double perimeter ( double, double, double );
double area ( double, double, double );



int main()
{

double s1, s2, s3;


 ifstream infile("A:\\IF1.txt");
    if(!infile){ 
        cerr << "Cannot open input file" << endl; 
        return 1; 
    } 
 
    ofstream outfile("A:\\0F1.txt"); 
    if(!outfile){ 
        cerr << "Cannot open output file" << endl; 
        return 1; 
    } 

	cout << setprecision(3); 
    cout << setiosflags(ios::fixed | ios::showpoint); 


			cout << "\n" << endl;

		
			


			bool Flag = true;
			while(infile >> s1 >> s2 >> s3){
				if(Flag==true){
					cout<<setw(15)<<"\tSIDES"<<setw(15)<<"TRIANGLE ?"<<setw(15)<<"PERIMETER"<<setw(15)<<"AREA\n" << endl; 
					Flag=false;
				}

				cout<<setw(15) << s1 << s2 << s3 <<setw(20)<<isatriangle(s1, s2, s3)<<setw(20)<<perimeter( s1, s2, s3 )<<setw(20)<< area(s1, s2, s3)<<"\n\n" <<endl; 


			}


return 0;
}


			//function isatriangle definition
			//x,y,z are parameters
			bool isatriangle( double x, double y, double z){

			return ((y + z > x) && (x + z > y) && (x + y > z)) ? true:false;


			}

			//function perimeter definition
			// a,b,c are parameters
				double perimeter ( double a, double b, double c ){
				cout << setprecision(3); 
				cout << setiosflags(ios::fixed | ios::showpoint);			

				double p = (a + b + c);


				return p;

			}

				//function semiperimeter definition
				// a,b,c are parameters
				double semiperimeter  ( double a, double b, double c ){

				double sp = (a + b + c )/2;

				

				return sp;

			}

				//function area definition
				// a,b,c, and are parameters

				double area ( double a, double b, double c ){

				cout << setprecision(3); 
				cout << setiosflags(ios::fixed | ios::showpoint);

				double sp;

				double B = sp * (sp-a)*(sp-b)*(sp-c);

				double A = sqrt(B);

				
				return A;
				


			}

i'm getting 1 or zero for my bool answer of true or false...
also, I am trying to get the area to call the semiperimeter fuction for calculation, but am not getting asnything back..am I doing it wrong?
Michele

hey all never mind..i've figured it out thanks...
working on one function calling another.
thanks for your help bonkey, prelude, and 'coned stoder'
scuba22