operator

[bluefox]

cout <<  30 << 3 ;

What operator "<<" is that ? i mean the one in between 30 and 3...
and what is the difference between "<", "<<", ">", ">>" ?
thx in advance...

[bluefox]

int f()
{    int a =10,b=10;
    if(a==b)
    {
                    a*=3;
    }
    a = a << 2;
    return a;
}
 
void main()
{cout<<f();}
 
 

I posted the wrong question, this is the original question, what does the operator in a "<<" 2 suppose to mean? and what it is called ?

[ilikepython]

int f()
{    int a =10,b=10;
    if(a==b)
    {
                    a*=3;
    }
    a = a << 2;
    return a;
}
 
void main()
{cout<<f();}
 
 

I posted the wrong question, this is the original question, what does the operator in a "<<" 2 suppose to mean? and what it is called ?

The "<<" is a bit shift operator. It shifts the binary "1"s and "0"s by the number after it.
So for example:
in your case a = 30
the binary bits for that is:
00011110
so if you shift the bits 2 times you get:
01111000
notice how the "1"s shifted to the left, that makes "a" equal 120

128 64 32 16       8 4 2 1
------------------------------------
0   1  1  1        1 0 0 0
0 +64+32+16  +     8+0+0+0 = 120
 

Does that help?

[bluefox]

The "<<" is a bit shift operator. It shifts the binary "1"s and "0"s by the number after it.
So for example:
in your case a = 30
the binary bits for that is:
00011110
so if you shift the bits 2 times you get:
01111000
notice how the "1"s shifted to the left, that makes "a" equal 120

128 64 32 16       8 4 2 1
------------------------------------
0   1  1  1        1 0 0 0
0 +64+32+16  +     8+0+0+0 = 120
 

Does that help?

sorry late reply, I lost the url to the forum...

Hah! thanks, really helps especially on the conversion table! NEAT!

But i hv another question....
I changed the shift operator from "<<" to this "<"
there's no error upon compilation, i tried to search "<" under the shift operator but no answer... you know what's that?

[Ganon11]

While "<<" is a bit shift operator, "<" does something completely different. "<" is the "less than" operator. It evaluates to true (i.e. a nonzero integer, usually 1) is the left hand side is less than the right hand side, and false (i.e. 0) if the right hand side is less than or equal to the left hand side. So your code

a = a < 3;

will assign 1 to a if a was originally less than 3, or 0 to a otherwise.

[bluefox]

While "<<" is a bit shift operator, "<" does something completely different. "<" is the "less than" operator. It evaluates to true (i.e. a nonzero integer, usually 1) is the left hand side is less than the right hand side, and false (i.e. 0) if the right hand side is less than or equal to the left hand side. So your code

a = a < 3;

will assign 1 to a if a was originally less than 3, or 0 to a otherwise.

Thanks! I got all the operators mixed up!