In DOS, if you write C/C++ programs using Turbo C/C++, you will need to select a memory model for the application. The memory model basically specifies the number of segments in memory for code, data and stack and has an effect on all pointers used in the program.

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Every running program (process) occupies some memory for its code and data. Linux follows a particular methodology for assigning memory addresses to various parts of a program. Linux assigns a “segment” to each of the following, where a segment can be defined as a single memory block of variable size:

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C learners are generally pretty comfortable with the str… series of functions: strlen() strcpy() strcat() strcmp() strlwr() strupr() However, I generally find a very poor awareness of the mem… series of functions: memcpy() memmove() memset() memchr()

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