1.problem recognition
2.information gathering
3.Requirement specification
4.system design
5.coding
6.system implementation
7.system review and manteinance
Francis Nkurumwa answered the question on February 8, 2018 at 13:26
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public:
virtual int f(int a)=0;
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};
class derived : public base {
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public:
virtual int f(int a)=0;
//...
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