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cs31 lecture 17

stdendl stdcout 56 types and typedef x a type refers

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Unformatted text preview: ion name, return Declaration: type, and precise argument list type, Declaration is optional 53 Functions in C++ x Syntax for implementation: <return type> <functionName> ([type1 arg1] [, type2 arg2])
 { [instructions] [instructions] } x Syntax for prototype declaration: <return type> <functionName> ([type1 arg1] [, type2 arg2])
; 54 Example int main()
 { return 0; return } double mysqrt(double x)
 { double return sqrt(x)
; return } 55 Return type x Can be any type previously declared int, float, double, const unsigned long int, … User-defined types x It implies there is a ‘return xxx’ statement in the It instructions, which can always be reached instructions, x Can be void: it is the special type stating that nothing is Can returned by the function returned void foo()
 { std::cout << “This is a void function!” << std::endl; std::cout } 56 Types and typedef x A type refers to a specific, well defined category of data type Known storage, known operations A variable (in C++)
 always has a type x Be careful: function arguments are typed too, but void is Be not an acceptable type for a variable! not x A useful feature: create an alias on a type typedef const unsigned int cuint_t; cuint_t myvariable = 42; cuint_t x Can create as many alias on the same type as we want 57 Another example typedef float number_t; number_t anumber; void setANumber(float x)
 { anumber = x / 2.0; anumber } int main()
 { i...
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