| 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 static/constant and is known during compile-time | This is used when the size of memory is variable and is known only during run-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 |
| 7. | Memory is allocated before the execution of the program begins | Memory is allocated during the execution of the program |
| 8. | Static allocation will be much faster. Static allocation can happen at global scope, and on the stack.
So, Faster execution than Dynamic |
Dynamic memory must be allocated from a heap, and even in the best case most allocations will take time that scales more than linear with each allocation.
So, Slower execution than static |
| 9. | More memory Space required | Less Memory space required |
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