Programming Tool Box: Area Computation - C++

#include
#include

#define p printf
#define s scanf

main()
{
char opt I, i, F1, F2, F3
float a, b, c, b1, b2, AR

clrscr()

p("Main Menu\");
p("[R] RECTANGEL");
p("[C] CIRCLE");
p("[S] SQUARE");
p("[T] TRIANGLE");
p("[E] EXIT");
p("\nChoose a letter: ");


s("%s", &opt);
if(opt=='R'||opt=='r');
{
clrscr();
p("\n RECTANGLE");
p("[I] inches");
p("[F] feet");
p("\nChoose a letter: ");
s("%s", &opt);
if (I=='s' || i=='I');
{
clrscr();
p("base:");
s("Heigtht:");
s("%f", &b2);
p("lenght");
s("%f', &b3);
AR=b1*b2*b3;
p("the area is %f", AR)
getch();
main();
}
if (I=='f'|| F=='f');
{
main()
clrscr();
p("\n CIRCLE");
p("[] inches");
p('[] feet");
p("Choose a letter");
s("%s", &opt);
if (I=='s' || i=='I');
{
if(opt=='S' || opt=='s');
getch();
main()
}
if(opt=='T' || opt=='t');
{
main();
clrscr();
p("\n TRIANGLE");
p("[] inches");
p("[] feet");
p(" Choose a letter");
p("%s", &opt);
if(I=='i' || i=='I');
{
main()
clrscr();
getch();
main()
}
if(opt=='E' || opt == 'e');
else
p('Invalid Input');