is it possible to double a command without a loop?

if I have an int with a value and I want to make a command repeat itself that values times?

and is there a command regarding even and uneven numbers?

and does anybody know if it's possible to redefine an expression?
e.g
if at the beginning of my code i defined abc as +
can I redefine it to - at another point in my code?

Quote:

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Originally Posted by NA84

if I have an int with a value and I want to make a command repeat itself that values times?

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goto if you must tho' it is best avoided.

Quote:

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Originally Posted by NA84

and is there a command regarding even and uneven numbers?

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Perhaps you mean the modulo operator.

Quote:

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Originally Posted by NA84

and does anybody know if it's possible to redefine an expression?
e.g
if at the beginning of my code i defined abc as +
can I redefine it to - at another point in my code?

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First define, then undefine, then re-define.

Quote:

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Originally Posted by itCbitC

goto if you must tho' it is best avoided.

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Maybe for that particular purpose, but there are good uses of goto.

Quote:

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Originally Posted by NA84

if I have an int with a value and I want to make a command repeat itself that values times?

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Believe me, you're far better to use a loop than anything else.
Goto will work, but it's generally frowned upon and a real pain to debug.

Quote:

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and is there a command regarding even and uneven numbers?

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If you are using integer values, test bit 0... 1 is odd, 0 is even.

Code:

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// true if odd
bool IsOdd(int Value)
  { return Value & 1; }

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Quote:

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and does anybody know if it's possible to redefine an expression?
e.g
if at the beginning of my code i defined abc as +
can I redefine it to - at another point in my code?

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If you are just looking to change the sign of the variable you can use x = 0-x; to flip between a positive number and a negative one.

If you mean to flip an equation from adding to subtracting... that's self modifying code which, even amongst bad ideas, is a really bad idea. It would make more sense to use some conditional term to decide whether to add or subtract.

Quote:

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Originally Posted by NA84

if I have an int with a value and I want to make a command repeat itself that values times?

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A recursive function? Something like this:

Code:

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#include <stdio.h>

void hello( int i )
{
    if ( i != 0 )
    {
        hello( i - 1 );
    }

    puts( "Hello\n" );
}

int main()
{
    hello( 5 );
    return 0;
}

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thank you all.
one more question...
if i have a counter and I need to printf one thing when the counter is a prime number and a different thing if it's not a prime no'. Do you have a good idea for that??

Quote:

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Originally Posted by NA84

thank you all.
one more question...
if i have a counter and I need to printf one thing when the counter is a prime number and a different thing if it's not a prime no'. Do you have a good idea for that??

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Obviously you need some algorythm to decide if a number is prime or not.

I'm thinking you need to try writing this program yourself, then if you run into trouble you can post your code here and we'll take a look at it for you.