c++ codes

                      LEARN TO CODE WITH CODESCHOOLU,BLOGSPOT.COM PROGRAMS USING SIMPLE FUNCTION 1. //PROGRAM TO FIND SIMPLE INTEREST USING UDF #include <iostream.h> #include <conio.h> float CAL(float,float,float); void main() {        clrscr();             float p,r,t,SI;             cout<<"Enter the principal amount : ";             cin>>p;             cout<<"Enter the rate of interest : ";             cin>>r;             cout<<"Enter the time of deposits : ";             cin>>t;             SI = CAL(p,r,t);             cout<<"The simple interest is : "<<SI;             getch(); } float CAL(float p, float r, float t) {            float a;             a = (p * r * t)/100;             return a; } 2. //PROGRAM TO FIND AREA OF CIRCLE USING UDF #include <iostream.h> #include <co