How To Find Size Of A Dynamic Array C Code Example

Example: how to dynamically allocate array size in c

// declare a pointer variable to point to allocated heap space int    *p_array; double *d_array;  // call malloc to allocate that appropriate number of bytes for the array  p_array = (int *)malloc(sizeof(int)*50);      // allocate 50 ints d_array = (int *)malloc(sizeof(double)*100);  // allocate 100 doubles   // use [] notation to access array buckets  // (THIS IS THE PREFERED WAY TO DO IT) for(i=0; i < 50; i++) {   p_array[i] = 0; }  // you can use pointer arithmetic (but in general don't) double *dptr = d_array;    // the value of d_array is equivalent to &(d_array[0]) for(i=0; i < 50; i++) {   *dptr = 0;   dptr++; }