Write a c++ program that calls 3 functions from the main function as described below : readdata ( ): reads 20 values from a file (varying from 0 to 100) representing the marks obtained by 5 students in 4 courses and stores them in the following 2d array: getavg ( ): returns in a id array, the average for each student. getcourseavg ( ): returns in an array the average of marks per course. the returned results should be displayed by the main function.

answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

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