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1
if-else
Microsoft Visual Studio 2005.
. . File|New|Project ( <Ctrl>+<Shift>+<N>). (Project types:) Visual C++, + . Win32, (Templates:) Win32 Console Application Name: . Location: C:\Work (. ).
(. ).
Next>.
Additional Options: Empty project (. ).
Finish.
Source Files Solution Explorer, Add|New Item
Add New Item. Categories: ( ) Code (. ). Templates: C++ File (.cpp) Name : .
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Add.
, <Ctrl>+<S>, Save . .
1
, . , //.
( !). ++ .
// #include
// :
#include <iostream> // -
#include <windows.h> //
using namespace std; //
int main()//
// (
// )
{
SetConsoleCP(1251); // CP 1251
SetConsoleOutputCP(1251); //
cout << " "; //
double a, b, c; //
cin >> a >> b;
// ( )
if (b) // b 0
{
c = a / b;
// (
cout << " : " << c << endl;
//
}
Else
// ( b 0),
//
cout << " 0\n";
return 0; //
}
//============================================================
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- .
2
a, b, c. , 
,
d = b2 - 4ac 
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. , <Tab>. .
!!! , , . , Lucida Console OK. , .
#include <iostream> //!!! /
#include <math.h>
#include <windows.h>
using namespace std;
int main()
{
SetConsoleCP(1251);
SetConsoleOutputCP(1251);
cout<<" A*x*x + B*x + C = 0\n";
cout<<" A,B,C, ";
double a=0,b=0,c=0,x1=0,x2=0;
cin >> a >> b >> c;
if (a!= 0) // :
{
double d = b*b - 4*a*c;
//
if (d > 0)
{
x1 = (-b + sqrt(d)) / (2*a);
x2 = (-b - sqrt(d)) / (2*a);
cout << " : " << x1 <<" "<< x2 << endl;
}
else if (d == 0)
{
x1=(-b) / (2*a);
cout<<" : " << x1 << endl;
}
else
cout<<" \n";
}
else // b*x + c = 0:
{
if (b) // b!= 0
{
x1 = -c / b;
cout<<" : " << x1 << endl;
}
else if (!c) // == 0
cout<<" \n";
else
cout<<" \n";
}
return 0;
}
, do :
#include
#include <conio.h>
/* _getch() */
using namespace std;
int main()
{
SetConsoleCP(1251);
SetConsoleOutputCP(1251);
Do
{
//
} while (_getch()!= 27);
return 0; }
}
. <Esc> .
