show the use of class in a c++

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#include using namespace std; class person { char name[30]; int age; public: void getdata(void); void display(void); }; void persion:: getdata(void) { cout<<"Enter name:"; cin>>name; cout<<"Enter age:"; cin>>age; } void person ::display(void) { cout<<"\n name:"<

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the length and breadth of a rectangle and radius of a circle are input through the keyboard. write a program to calculate the area and perimeter of the rectangle, and the area and circumference of the circle

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The length and breadth of a rectangle and radius of a circle are input through the keyboard. write a program to calculate the area and perimeter of the rectangle, and the area and circumference of the circle  #include<stdio.h> # include<conio.h> int main(){ float l,b,r, ca,cc,ra ,rp; printf("Enter the length of rectangle:"); scanf("%f",&l); printf("Enter the breadth of rectangle:"); scanf("%f",&b); printf("Enter the radius of circle:"); scanf("%f",&r); ra=l*b; rp=2*(l+b); ca=3.14*r*r; cc=2*3.14*r; printf("\nThe area of rectangle :%0.2f", ra); printf("\n The perimeter of rectangle : %.2f ,rp); printf("\nThe  area of circle:%2f:",ca); printf("\n The circumference of circle:%.2f",cc); return 0; }  output- -- Enter the length of rectangle:3                            Enter the breadth of rectangle:5                   ...
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If lengths of three sides of a tringle are input through the keyboard write a program to find the area of tringle.

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 If lengths of three sides of a triangle are input through the keyboard write a program to find the area of triangle. // Find the area of triangle  ,given the sides. #include <stdio.h> #include<math.h>                    //for sqrt() int main()  { float a,b,c,sp, area; printf("\nEnter sides of a triangle:"); scanf("%f%f%f",&a,&b,&c); sp =(a+b+c)/2; area=sqrt(sp*(sp-a)*(sp-b)*(sp-c)); printf("Area of triangle=%f\n",area); return 0; } output--- Enter sides of tringle: 4   5   6                    Area of triangle= 9.921567   paper of size A0 has dimensions 1189 mmx 841 mm .Each subsequent size A(n) is defined as A(n-1) cut in half parallel to its shorter sides .Thus paper of size A1 would have dimensions 841 mm X 594 mm .Write a program to calculate the print paper sizes A0,A1,A2,.........A8.  ...
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paper of size A0 has dimensions 1189 mmx 841 mm .Each subsequent size A(n) is defined as A(n-1) cut in half parallel to its shorter sides .Thus paper of size A1 would have dimensions 841 mm X 594 mm .Write a program to calculate the print paper sizes A0,A1,A2,.........A8.

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 paper of size A0 has dimensions 1189 mm X 841 mm .Each subsequent size A(n) is defined as A(n-1) cut in half parallel to its shorter sides .Thus paper of size A1 would have dimensions 841 mm X 594 mm .Write a program to calculate the print paper sizes A0,A1,A2,.........A8 #include<stdio.h> int main() { int i, w=841 ,h=1189 , t ; for(i=0;i<9;i++) printf("\nA%d:%d x %d",i,w,h); t=h; h=w; w=t/2; return 0; }  output---   A0 :841 x 1189                               A1 : 594 x 841                               A2 : 420 x 594                             A3 : 297 x 420                            A4 : 210 x 297      ...
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