summation symbol in C++

[Nouman Shehzad]

Write your question here.
any one here can help me please....?
my question is that "how we can write summation symbol in C++......"

[lastchance]

#include <iostream>
#include <string>
using namespace std;

int main()
{
   const int  SIZE  = 10;
   const char SOLID = '*';
   const char SPACE = ' ';

   cout << string( SIZE, SOLID ) + '\n';
   for ( int i = 1       ; i <= SIZE - 1; i++ ) cout << string( i, SPACE ) + SOLID + '\n';
   for ( int i = SIZE - 2; i > 0        ; i-- ) cout << string( i, SPACE ) + SOLID + '\n';
   cout << string( SIZE, SOLID ) +'\n';
}

[lastchance]

#include <iostream>
#include <string>
using namespace std;

const int  SIZE  = 10;
const char SOLID = '*';
const char SPACE = ' ';

void plot( int m, int n ) { cout << string( m, SPACE ) + string( n, SOLID ) + '\n'; }

int main()
{
   plot( 0, SIZE );
   for ( int i = 1       ; i <= SIZE - 1; i++ ) plot( i, 1 );
   for ( int i = SIZE - 2; i > 0        ; i-- ) plot( i, 1 );
   plot( 0, SIZE );
}

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  *
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**********

[Nouman Shehzad]

friends,
can any one tell me the simplest way to write the code for summation....?

[jonnin]

we need a better question.

I mean, with what you gave us, all we can say is:

int E = 0;
for(i = 0; i< something, i++)
E+=term;

Or, if you are trying to print the E /greek symbol, grab a unicode character that represents it and print it.

[lastchance]

Well, I thought my answer was quite artistic! Presumably not what was intended though.

my question is that "how we can write summation symbol in C++......"

Did you mean ... +

[JLBorges]

Unix/Linux

#include <iostream>
#include <locale>

int main()
{
    const char sigma[] = u8"\u03A3" ; // U+03A3
    
    std::cout.imbue( std::locale( "C.UTF-8" ) ) ;
    std::cout << sigma << '\n' ;
}

Windows: with the console font set to something suitable (eg. Lucida Console)

#include <iostream>
#include <io.h>
#include <fcntl.h>

int main()
{
    const wchar_t sigma[] = L"\u03A3" ; // U+03A3

    ::_setmode( _fileno( stdout ), _O_WTEXT );
    std::wcout << sigma << '\n' ;
}

[Cubbi]

> std::cout.imbue

Not actually needed on Unix/Linux since you're using std::cout and not std::wcout: with utf-8 on the internal side (due to u8"..."), the default locale works just fine since it's non-converting for narrow I/O (same as the utf-8 locale actually)