General Discussions

Static V/S Dynamic Memory Allocation

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Si. No Static Memory Allocation Dynamic Memory Allocation
1 Memory allocation happens at compile time Memory allocation happens at Run time
2 It applies to global variables, file scope variables, and variables qualified with static defined inside functions It applies to variables that allocate memory during runtime using memory allocation API’s
3 The size is fixed when the program is created Programmer can control the exact size and the lifetime of the memory locations
4 Memory allocated at compile time in stack or other data segments Memory is allocated during run-time in heap
5. This is used when the size of memory is variable and is known only during run-time This is used when the size of memory is static/constant and is known during compile-time
6. The compiler allocates the required memory space for a declared variable It uses functions such as malloc( ) or calloc( ) to get memory dynamically

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