CODEWITHSUNDEEP
carraysmultidimensional-array
Sayam Qazi
Sayam Qazi

Reputation: 193

moving elements of an array in c

I have two arrays as following .I am using C language

    int array1[7][8];
    int array2[8][7];

all elemnts of array 1 have some values

I want to assign all values of array 1 to array 2 . Because both arrays have total 56 elements.Values should be able to fit.I want to assign all 56 values of array 1 to array 2 such that if they are seen as 1 dimensional array then they should look identical I tried to iterate through a loop from 0 to 56 and tried to relate their indexes but was unable to figure out. I tried something like this but i am mistaking somewhere 

  for (i = 0 ; i < 56 ; i ++)
  {
            array2[i / 7 ][ i % 7 ] = array1[ i / 6 ][ i % 6];
  }

Upvotes: 1

Views: 118

Answers (3)

2501
2501

Reputation: 25752

Use two loops:

for ( size_t i = 0 ; i < 7 ; i++)
{
   for ( size_t j = 0 ; j < 8 ; j++)
   {
        array2[j][i] = array1[i][j];
   }
}

And with a single loop:

for ( size_t i = 0 ; i < 56 ; i++ )
{
    array2[i / 7 ][ i % 7 ] = array1[ i / 8 ][ i % 8 ] ;        
}

Upvotes: 2

alk
alk

Reputation: 70893

It shall be

for (i = 0; i < 7*8; ++i)
{
  array2[i / 7][i % 7] = array1[i / 8][i % 8];
}

Upvotes: 1

pmg
pmg

Reputation: 108968

This is not a transposition of the array elements!

Ignore the dimensions and memmove() the data around.

memmove(array2, array1, sizeof array1);

memmove() doesn't care about the layout of the array elements and the Standard guarantees all array elements (even of multi-dimensional arrays) are sequential.

Upvotes: 2

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