Post: C++ Help
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01-27-2011, 01:45 AM
#1
fightinillini94
Climbing up the ladder
#include <iostream>
#include <cmath>
#include <cstdlib>
int main(){
using namespace std;
double a;
double b;
double c;
double d;
double e;
double f;
double g;
double y;
double n;
cout << "Welcome to Justin's Infinite Geometric Solver!" << endl;
g=y;
while (g=y){
cout << "Input the first term of the infinite geometric series: " << endl;
cin >> a;
cout << "Input the second term of the infinite geometric series: " << endl;
cin >> b;
cout << "Input the third term of the infinite geometric series: " << endl;
cin >> c;
d = abs(c/b);
e = 1 - d;
if(d > 1){
cout << "Diverges!" << endl;
cout << "Would you like to find another sequence? (y or n)" << endl;
cin >> g;
}
else{
f = a/e;
cout << "The sum of this infinite geometric sequence is " << f << endl;
cout << "Would you like to find another sequence? (y or n)" << endl;
cin >> g;
}
}
cin.get();
return 0;
}
The problem that I have run into is the while function. When the program asks if you want to find another sum, it infinitely loops. Can anybody help me solve this problem?
01-27-2011, 02:13 AM
#2
El Violador
< ^ > < ^ >
Originally posted by fightinillini94
Hey guys I just learned the basics of C++ yesterday and decided to make a simple program that solves infinite geometric sequences. I picked this because we just learned it in trig/pre-calc. Here is my code so far:
The problem that I have run into is the while function. When the program asks if you want to find another sum, it infinitely loops. Can anybody help me solve this problem?
#include <iostream>
#include <cmath>
#include <cstdlib>
int main(){
using namespace std;
double a;
double b;
double c;
double d;
double e;
double f;
double g;
double y;
double n;
cout << "Welcome to Justin's Infinite Geometric Solver!" << endl;
g=y;
while (g=y){
cout << "Input the first term of the infinite geometric series: " << endl;
cin >> a;
cout << "Input the second term of the infinite geometric series: " << endl;
cin >> b;
cout << "Input the third term of the infinite geometric series: " << endl;
cin >> c;
d = abs(c/b);
e = 1 - d;
if(d > 1){
cout << "Diverges!" << endl;
cout << "Would you like to find another sequence? (y or n)" << endl;
cin >> g;
}
else{
f = a/e;
cout << "The sum of this infinite geometric sequence is " << f << endl;
cout << "Would you like to find another sequence? (y or n)" << endl;
cin >> g;
}
}
cin.get();
return 0;
}
The problem that I have run into is the while function. When the program asks if you want to find another sum, it infinitely loops. Can anybody help me solve this problem?
im very new to c++ too so I may not be correct about this:
what i think is where you have "while(g=y){}"
i think it loops because neither "g" nor "y" changes value in your function, therefore g is equal to y and always will be.
also, it could be because (g=y) rather than the boolean value (g==y)
im very new to this so once again, dont take this as definite but its possible.
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01-27-2011, 04:18 AM
#3
fightinillini94
Climbing up the ladder
Originally posted by Ar88rA
im very new to c++ too so I may not be correct about this:
what i think is where you have "while(g=y){}"
i think it loops because neither "g" nor "y" changes value in your function, therefore g is equal to y and always will be.
also, it could be because (g=y) rather than the boolean value (g==y)
im very new to this so once again, dont take this as definite but its possible.
what i think is where you have "while(g=y){}"
i think it loops because neither "g" nor "y" changes value in your function, therefore g is equal to y and always will be.
also, it could be because (g=y) rather than the boolean value (g==y)
im very new to this so once again, dont take this as definite but its possible.
Thanks for the reply. I tried (g==y) and it still looped. I just need to figure out how to get the program to stop and check with the user before it loops again
01-28-2011, 05:46 AM
#5
marvin1554*
Hello!
01-28-2011, 05:52 AM
#6
3arc
Meow.
Originally posted by Marvin1554
this is C#.... C++ is like
If checkbox1.checked = true then
webbrowser1.refresh()
end if
If checkbox1.checked = true then
webbrowser1.refresh()
end if
No, what OP is doing is C++.
@OP: I fixed up your code, but for ease of use I added a second function to handle exiting the program, I also had to prototype that function.
#include <iostream>
#include <cmath>
#include <cstdlib>
using namespace std;
int exit();
int main() {
double a;
double b;
double c;
double d;
double e;
double f;
cout << "Welcome to Justin's Infinite Geometric Solver!" << endl;
cout << "Input the first term of the infinite geometric series: " << endl;
cin >> a;
cout << "Input the second term of the infinite geometric series: " << endl;
cin >> b;
cout << "Input the third term of the infinite geometric series: " << endl;
cin >> c;
d = abs(c/b);
e = 1 - d;
if(d > 1){
cout << "Diverges!" << endl;
}
else{
f = a/e;
cout << "The sum of this infinite geometric sequence is " << f << endl;
}
exit();
}
int exit() {
char g;
cout << "Would you like to find another sequence? (y or n)" << endl;
cin >> g;
if(g == 'y'
{
main();
}
else if (g=='n' {
return 0;
}
else return 0;
}
Last edited by
3arc ; 01-28-2011 at 06:17 AM.
The following user thanked 3arc for this useful post:
01-28-2011, 09:26 PM
#7
fightinillini94
Climbing up the ladder
Originally posted by 3arc
No, what OP is doing is C++.
@OP: I fixed up your code, but for ease of use I added a second function to handle exiting the program, I also had to prototype that function.
@OP: I fixed up your code, but for ease of use I added a second function to handle exiting the program, I also had to prototype that function.
#include <iostream>
#include <cmath>
#include <cstdlib>
using namespace std;
int exit();
int main() {
double a;
double b;
double c;
double d;
double e;
double f;
cout << "Welcome to Justin's Infinite Geometric Solver!" << endl;
cout << "Input the first term of the infinite geometric series: " << endl;
cin >> a;
cout << "Input the second term of the infinite geometric series: " << endl;
cin >> b;
cout << "Input the third term of the infinite geometric series: " << endl;
cin >> c;
d = abs(c/b);
e = 1 - d;
if(d > 1){
cout << "Diverges!" << endl;
}
else{
f = a/e;
cout << "The sum of this infinite geometric sequence is " << f << endl;
}
exit();
}
int exit() {
char g;
cout << "Would you like to find another sequence? (y or n)" << endl;
cin >> g;
if(g == 'y' {
main();
}
else if (g=='n' {
return 0;
}
else return 0;
}
Thanks so much man. I also noticed you put "use namespace std" up top. You can put it there instead of your main function?
02-07-2011, 07:40 PM
#9
TheUberFail
Banned
Originally posted by fightinillini94
Thanks so much man. I also noticed you put "use namespace std" up top. You can put it there instead of your main function?
Originally posted by 3arc
You /could/ put it anywhere, but it's best to keep it at the top.
using namespace std; only applies to where you put it, if you put it at the top it becomes global, say you put it in
int main()
{
using namespace std;
}
it only applies inside int main()
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