Area & Parameter of Rectangle , Area & Circumference of circle

/* write a program to find the Area,parameter of rectangle,Area Circumference of circle */

void main()
float l, b, r, ar, pr, ac, cc;
printf("\n Enter the Lenght & Breath of Rectangle");
printf("\n Enter radius of Circle");
ar = l * b ;
pr = 2 * (l + b ) ;
ac = 3.14 * r * r ;
cc = 2 * 3.14 * r ;
printf("\n Area of Rectangle = %f",ar);
printf("\n Parameter of Rectangle = %f",pr);
printf("\n Area of Circle = %f ",ac);
printf("\n Circumference of Circle = %f ",cc);

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