for example:
int *start; start = (int*)malloc(40); if wanted iterate through 40 bytes, how so? tried doing like:
while(start != null){ start++; } but iterates through massive number of values, greater 40. thus, how ensure iterate through 40 bytes.
thanks help.
there 2 issues here.
a single ptr++ skips as many bytes type of element points to.
here type int, skip 4 bytes each time (assuming 32 bit machine since integer 4 bytes (32 bits) there).
if want iterate through 40 bytes (one byte @ time), iterate using char data type (or type cast int* char* , increment)
the other problem loop termination.
there no 1 putting null @ end here, loop keep running (and pointer advancing forward) until runs may null or goes out of allotted memory area , crashes. the behavior undefined.
if allocated 40 bytes, have terminate @ 40 bytes yourself.
update:
based upon comment cum down vote original question, worth mentioning type casting result of malloc not idea in c. primary reason it potentially tamper failed allocation. requirement in c++ though. details can found in exact same question on so. search "casting return value of malloc"
