Ratikanta Sahoo

I would like to know how we can use two dimensional arrays in strings? I would also know whether we can compare two dimensional strings?

2D Array ===================== 1. Array always contains contnineous memory address. 2. Array index is always start from 0 3. Ex of 1D array: int 1dArray[4] = {10,20,30,40} Memory Alocation of above array : Index Address Value ============================================================================= 1dArray[0] 10008 10 1dArray[1] 10008+4(int size in 64 bit)= 10012 20 1dArray[2] 10012+4(int size in 64 bit)= 10016 30 1dArray[3] 10016+4(int size in 64 bit)= 10020 40 4. Ex of 2D array: int 1dArray[2][2] = {10,20,30,40} Memory Alocation of above array : Index Address Value ============================================================================= 1dArray[0][0] 10008 10 1dArray[0][1] 10008+4(int size in 64 bit)= 10012 20 1dArray[1][0] 10012+4(int size in 64 bit)= 10016 30 1dArray[1][1] 10016+4(int size in 64 bit)= 10020 40 [0][0] [0][1] 10008 10012 10016 10020 [1][0] [1][1]

1. calloc(...) allocates a block of memory for an array of elements of a certain size. By default the block is initialized with 0. The total number of memory allocated will be (number_of_elements * size). Ex : int * array = (int *) calloc (10, sizeof (int)); malloc(...) takes only a single argument which is the memory required in bytes. malloc(...) allocated bytes of memory and not blocks of memory like calloc(...). Ex : double * p = (double *) malloc (sizeof (double)); 2. malloc(...) allocates memory blocks and returns a void pointer to the allocated space, or NULL if there is insufficient memory available. calloc(...) allocates an array in memory with elements initialized to 0 and returns a pointer to the allocated space.