Detour-214

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Detour Data representation Memory o Abstraction Basic abstraction: array addressable of bytes An area of memory can be accessed using different widths 1 1 1 1 1 1 1 1 1 1
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Contents of memory Content of a memory location is a bit pattern representing 1 of 4 possibilities: o Undefined o Data o Program instruction o Address of a memory location o Remember: which is correct is context dependent! 2 2 2 2 2 2 2 2 2 2
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o Memory and Variables When we create a local variable in a HLL But do not assign a value to it, for example “int x;” 3 3 3 3 3 3 3 3 3 3
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o The bit pattern already stored at that (those) memory locations is arbitrary/unknow/random o Always initialize your variables! o Arrays in memory Name of the array (for example “ai”) is a pointer whose value is the address of the memory location (&ai[]) of the 0 th element of the array. o Size of data types Sizeof() function
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