![]() When you compile a program, the compiler enters through the main function and a stack frame is created on the stack. The stack is a segment of memory where data like your local variables and function calls get added and/or removed in a last-in-first-out (LIFO) manner. The text segment is often read-only and prevents a program from accidentally modifying its instructions. The text segment, also known as the code segment, contains the machine instructions which make up your program. Having unused variables in our programs gets flagged and is not a best practice. ![]() The uninitialized data segment consists of all global and static variables that are initialized to zero or do not have explicit initialization in source code.Īt Holberton, most of the time we are not concerned about the uninitialized data segment because when we compile our programs with gcc, we use the flags, -Wall -Wextra -pedantic -Werror and we use an internal stylistic checker called betty which treats warning as errors when uninitialized variables are present. The initialized data segmentconsists of all the global and static variables that are initialized when a file gets compiled. The amount of memory that get’s assigned to an application depends on the computer’s architecture and will vary across most devices, but the variable that remains constant is the five parts of an application’s memory which are the heap, stack, initialized data segment, uninitialized data segment, and the text segment. The memory that is assigned to a program or application in a computer can be divided into five parts. ![]() When we write applications, files, or any logic that is typed in an editor and executed on the computer, the computer has to allocate memory for the program to run. How does understanding the two make you a better software engineer? What are the five segments of memory? What better way to build a solid foundation of how memory gets allocated then to write a technical post on the stack versus the heap? This article explains in depth: I’m four months into the curriculum at Holberton School and we’ve solved multiple problems using the malloc, realloc, calloc and free functions in the C programming language. ![]()
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