String issue

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String issue

 
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  #1
Oct 24th, 2009
This program collects 3 numbers from the user and then simple adds the total and spits out a response. problem is the final output is blank, it just says 'The total is: '_____ but nothing there. Whats wrong??

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5. int _tmain(int argc, _TCHAR* argv[])
  6. {
  7. 	int num[3];
  8. 	for(int x=0; x<3; x++)
  9. 	{
  10. 		cout << "Enter a number: ";
  11. 		cin >> num[x];
  12. 	}
  13. 	int sum=0;
  14. 	int x=0;
  15. 		for(int x=0; x<3; x++);
  16. 		{
  17. 			x=x+sum;
  18. 			cout << "The total is: ";
  19. 			cin >> x;
  20. 		}
  21.  
  22. 	return 0;
  23. }
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  #2
Oct 24th, 2009
C++ Syntax (Toggle Plain Text) 
  1. cout << "The total is: " << x;
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  #3
Oct 24th, 2009
thanks, i feel kinda dumb putting x as cin i changed that to
C++ Syntax (Toggle Plain Text) 
  1. cout << "The total is: " << x << endl;

but the total just comes out as zero.
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  #4
Oct 24th, 2009
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Originally Posted by itzaaron View Post
C++ Syntax (Toggle Plain Text) 
  1. 	int sum=0;
  2. 	int x=0;
  3. 		for(int x=0; x<3; x++);
  4. 		{
  5. 			x=x+sum;
  6. 			cout << "The total is: ";
  7. 			cin >> x;
  8. 		}
  9.  
  10. 	return 0;
  11. }
Here you're not using your array to add the variables. The first pass it is always going to be zero because x = 0 and sum = 0 so 0 + 0 = 0. You should really use separate variables, one for your for statements and another for your array variables. It would clean up your code a bit and make it easier to understand.
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0
  #5
Oct 24th, 2009
This is problematice :

C++ Syntax (Toggle Plain Text) 
  1. int sum = 0;
  2. int x=0; //  you declared it inside the for loop below
  3. 		for(int x=0; x<3; x++);
  4. 		{
  5. 			x=x+sum; //what happened to num array?
  6. 			cout << "The total is: ";
  7. 			cin >> x;
  8. 		}
change to :
C++ Syntax (Toggle Plain Text) 
  1. int sum = 0;
  2. 		for(int x=0; x<3; x++);
  3.                      sum = sum + num[x];
  4.  
  5. 		cout << "The total is: " << x << endl;
Last edited by firstPerson; Oct 24th, 2009 at 10:45 pm. 
1) Prove that the area of a circle is pi*r^2, where "r" is the radius of the circle.
2) Problem 2[b]solved by : jonsca
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0
  #6
Oct 24th, 2009
Okay I see the logic, but there is a building error: 'x' is undeclared identifier. Heres my updated code.

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5. int _tmain(int argc, _TCHAR* argv[])
  6. {
  7. 	int num[3];
  8. 	for(int x=0; x<3; x++)
  9. 	{
  10. 		cout << "Enter a number: ";
  11. 		cin >> num[x];
  12. 	}
  13.       int sum = 0;
  14.       for(int x=0; x<3; x++);
  15.       sum = sum + num[x];
  16.  
  17.       cout << "The total is: " << x << endl;
  18.  
  19. 	return 0;
  20. }
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1
  #7
Oct 24th, 2009
declare x outside of the for loop. Usually works for some reason..
#include <iostream>
using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
	int num[3], x = 0;
	for(x; x<3; x++)
	{
		cout << "Enter a number: ";
		cin >> num[x];
	}
      int sum = 0;
      for(int x=0; x<3; x++);
      sum = sum + num[x];
       
      cout << "The total is: " << x << endl;

	return 0;
}
Last edited by restrictment; Oct 24th, 2009 at 11:05 pm.
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  #8
Oct 24th, 2009
It compiles without errors but the total is still coming out '0'
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  #9
Oct 24th, 2009
print out the sum, cout<<sum << endl; 
1) Prove that the area of a circle is pi*r^2, where "r" is the radius of the circle.
2) Problem 2[b]solved by : jonsca
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  #10
Oct 24th, 2009
I already tried that it just outputs the first number that the user entered as the total.
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