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Briefly explain default arguments.

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A default value can be set for a parameter(argument) of a function. When the user does not give a value the function will take the default value. An important thing remember is an argument cannot have a default value unless all arguments on its right side must have default value.

Functions with valid default arguments are given below 

float area(int x, int y, int z=30); 

float area(int x, int y=20, int z=30); 

float area(int x=10, int y=20, int z=30); 

Functions with invalid default arguments are given below

float area(int x=10, int y, int z); 

float area(intx, inty=20, int z); 

float area(int x=10, int y=20, int z);

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