Im learning C++
Im learning C++
Ok so I'm learning C++ and I just started learning, I made a simple code but it won't work. This is really simple but it just won't work for me
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#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
int b = 10;
int a;
int sum = a + b;
cout << "give a number";
cin >> a;
cout << sum;
return 0;
}
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It keeps giving the output as 10 no matter what "a" is
--------------------------------------------------------------------------------------------------------------
#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
int b = 10;
int a;
int sum = a + b;
cout << "give a number";
cin >> a;
cout << sum;
return 0;
}
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It keeps giving the output as 10 no matter what "a" is
Originally Posted by Lawrencecunt
Ok so I'm learning C++ and I just started learning, I made a simple code but it won't work. This is really simple but it just won't work for me
--------------------------------------------------------------------------------------------------------------
#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
int b = 10;
int a;
int sum = a + b;
cout << "give a number";
cin >> a;
cout << sum;
return 0;
}
--------------------------------------------------------------------------------------------------------------
It keeps giving the output as 10 no matter what "a" is
--------------------------------------------------------------------------------------------------------------
#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
int b = 10;
int a;
int sum = a + b;
cout << "give a number";
cin >> a;
cout << sum;
return 0;
}
--------------------------------------------------------------------------------------------------------------
It keeps giving the output as 10 no matter what "a" is
Code:
cout << "give a number"; cin >> a;
Code:
int main(int argc, char** argv)
{
cout << "give a number";
cin >> a;
int b = 10;
int a;
int sum = a + b;
Originally Posted by sunkist0
move
here
your math operations are before your input, so it's adding 10 to in initialized variable with no value (a = 0)
Code:
cout << "give a number"; cin >> a;
Code:
int main(int argc, char** argv)
{
cout << "give a number";
cin >> a;
int b = 10;
int a;
int sum = a + b;
int a;
to the very top
Thank you very much
Originally Posted by Lawrencecunt
It didn't work but i fixed it by moving
int a;
to the very top
Thank you very much
int a;
to the very top
Thank you very much
what you have done is a+b before you got a value for a.
if you want it to work you need to first get a value for a and then add it to something
if you want it to work you need to first get a value for a and then add it to something
You are doing it all wrong, you support to get a error trying to use "a" because it's not initialize.
Right code below. What you support to be doing is trying to get the sum of a + b.
Try to give "a" a value like you did "b".
Code:
#include <Windows.h>
#include <iostream>
using namespace std;
int main()
{
SetConsoleTitle(L"TutorialApplication");
int b = 10;
int a;
int sum = a + b;
cout <<"Give a number: ";
cin >> a;
cout << sum;
cin.get();
return 0;
}
Try to give "a" a value like you did "b".
Code:
#include <Windows.h>
#include <iostream>
using namespace std;
int main()
{
SetConsoleTitle(L"TutorialApplication");
int b = 10;
int a = 10;
int sum = a + b;
cout <<"Give a number: ";
cin >> sum;
cout << sum;
cin.get();
return 0;
}
I don't really know why 4 people had to answer a question about the declaration of a variable.
Originally Posted by InunoTaishou
I don't really know why 4 people had to answer a question about the declaration of a variable.
Code:
#include <iostream>
using namespace std;
int main(int argc, char** argv)
{
int b = 10;
int a;
int sum;
cout << "give a number";
cin >> a;
// Calculate sum only AFTER you get a value for a.
sum = a + b;
cout << sum;
return 0;
}
Originally Posted by CoBraX
Lol so he can see go with which one he feel like he like the best. & beside you should be happy be are willing to share some knowledge.
Code:
cin >> sum; cout << sum;
There are numerous ways this could be done. What OP needs to understand though is once you define a declare a variable and initialize it (int a is declare, sum = a + b is defining) it stays that value until you redefine it (i.e., when you tell that variable to be something else)
When you first wrote sum = a + b; you made sum be the value of a + b at that point. It does not change until you make it change.
Code:
#include <iostream>
#include <functional> // std::plus<Type>()(variable, variable)
int add(int first, int second)
{
return first + second;
}
int main()
{
// Declare b and sum, declare a AND initialize it to the value of 10
int a = 10;
int b, sum;
std::cout << "Give me a number: ";
std::cin >> b;
// std::plus<type> guarantees the addition of pointers as well as variables
sum = std::plus<int>()(a, b);
// Declare sum up there, initialize it right here
sum = a + b;
// Declare sum up there, pass the variabls to another function to do the math for us
sum = add(a, b);
std::cout << sum << std::endl;
// main() does not have to return a value
// return 0;
}
Originally Posted by Hitokiri~
And what makes me cry is all the answers are wrong in the first place.
Originally Posted by InunoTaishou
...
- Main doesn't need to return a value but if you declare it as int main() you need to at least return something or it'll throw an error/warning ( Cant remember which )
- void main() doesn't require anything returned denoted by its void type.
Originally Posted by Hitokiri~
One thing I had to add was
- Main doesn't need to return a value but if you declare it as int main() you need to at least return something or it'll throw an error/warning ( Cant remember which )
- void main() doesn't require anything returned denoted by its void type.
Lol so he can see go with which one he feel like he like the best. & beside you should be happy be are willing to share some knowledge.
@InunoTaishou, thank you for correcting me. After all that's why we are here to learn & share.
This thread made me laugh .
Impossible how you laugh in this thread XD
