Two-Dimentional Arrays

Two-Dimentional Arrays

So far we have discussed the array variable that can

store a list of values .There will be situation where a table of values will have to be stored.Consider the following data table, which shows the value of the sales of three items by
four sales mens:
         item 1        item 2       item 3
salesmen 1   310           275          365
salesmen 2   210           190          325
salesmen 3   405           325          240
salesmen 4   260           300          290


   the table contains a total of 12 values, three in each line.We think of this table as a matrix consisting of four rows and tree columns. Each row represents the values of sales by a particular salesmen and each column represents the values of sales of a particular item.In mathematics, we represent a particular value in a matrix by using two sub scripts such as Vij. Here V denotes the entire matrix and Vij refers to the value in the ith row and jth column. For example, in the above table V23 refers to the value 325. C allows us to define such tables of items by using two-dimensional arrays. The table discussed above can be  defined in c as v[2][3].

Two-Dimensional arrays are declared as follows:
   type array-name [row-size][column-size];    note that unlike most other languages which we use one pair of parenthesis with commas to separate array sizes.C  places each size in the own set of brackets.Two dimensional  arrays are stored in memory as follows:

 [0][0]      [0][1]        [0][2]
     310         275           365

    [1][0]      [1][1]        [1][2]
     210        190            325

    [2][0]      [2][1]        [2][2]
     405         325           240

    [3][0]      [3][1]        [3][2]
     260         300           290