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johnnyBravo

Question on making one array equal another?

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Ive got: int a[4]={0,1,2,3}; int b[4]={3,2,1,0}; how would i make a equal b in one line? or is that possible eg something like a=b(tried this, doesn''t work) thanks,

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The reason why it didn''t work is because you have not overloaded (defined your own implementation for) the = operator.

Could you be more specific by what you mean when they are equal? Are you treating them as sets?

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memcpy or a for loop


for (int i = 0; i<4; i++)
{
a[i] = b[i]
}


it may loop one extra time (for loops have always confused me a bit) but im pretty confident this doesnt

oh.... one line....

[edited by - Ademan555 on January 16, 2004 11:42:21 AM]

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Yours is one line Ademan:


for (int i = 0; i<4; i++){a[i] = b[i]}

// And correct me if I''m wrong, but if you change it to this, it

// shouldn''t run the extra loop

for(int i = -1; i<4; ++i){a[i] = b[i]}

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for(int i=0;i < 4;i++)
a[ i ]=b[ i ];

Is the correct way to do it. However, I recommend using memcpy (for C) or std::copy (for C++).

[edited by - brassfish89 on January 17, 2004 12:42:08 PM]

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Use boost::array class its handy indeed.


boost::array<int,4> a = {{0,1,2,3}};
boost::array<int,4> b = {{2,4,6,8}};
a = b;
or
std::copy (a.begin(), a.end(), b.begin());



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