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//program to call or invoke constructor of base class in derived class #include<iostream.h> #include<conio.h> #include<string.h> class box { int width; int depth; int height; public: box(int w,int d,int h) { width=w; depth=d; height=h; } void bshowdata() { cout<<"\nwidth of box is "<<width; cout<<"\ndepth of box is "<<depth; cout<<"\nheight of box is "<<height; } }; class colourbox : public box { char colour[20]; public: colourbox(char n[20],int w,int d,int h):box(w,d,h) { strcpy(colour,n); } void cshowdata() { bshowdata(); cout<<"\ncolour of box is "<<colour; } }; void main() { clrscr(); colourbox ob("red",10,20,30); ob.cshowdata(); getch(); }