Memory allocation for global and local variables

Question

I have learnt that memory for global variables are allocated at program startup whereas memory for local variables are allocated whenever function call is made.

Answer 1

case 2 and case 3 would result in stack overflow as you are asking for 64 MB of stack memory wherein your stack is typically 8 MB on Linux . this would result in random bad things and /or core dumps and crashes.

this answer greatly explains various sections of process address space (.text, .bss , .data )and how various allocations of variables is done.