.programmingenhance

  #include<fstream.h> void main() { ofstream fout; fout.open(" out.txt "); char str[300]=" Time is C++ File Handling "; fout<<str; fout.close(); }

  #include<fstream.h> int main() { ofstream fout; fout.open(" NOTES.TXT "); for ( int i=1;i<=100;i++) fout<<i<<endl; fout.close(); return 0; }

Area = sqrt(s*(s-a)*(s-b)*(s-c)) where s=(a+b+c)/2 #include<iostream.h> #include<conio.h> #include<math.h> void main() { float a,b,c,s,Area; cout<<" Enter three sides of triangle "; cin>>a>>b>>c; s=(a+b+c)/2; Area=sqrt(s*(s-a)*(s-b)*(s-c)); cout<<" Area of triangle is "<<Area; getch(); }

  #include<iostream.h> #include<conio.h> #include<math.h> void main() { float P,R,T,CI; cout<<" Enter Principal, Rate and Time "; cin>>P>>R>>T; CI=P*pow((1+R/100),T) - P; cout<<" Compound Interest is "<<CI; getch(); }

  Characters ASCII Values A – Z 65 – 90 a – z 97 – 122 0 – 9 48 – 57 special symbols 0 - 47, 58 - 64, 91 - 96, 123 – 127   #include<iostream.h> #include<conio.h> int main () { char ch; cout<<" Enter any character: "; cin>>ch; if (ch>=65 && ch<=90) cout<<" Character is a capital letter "; else if (ch>=97 && ch<=122) cout<<" Character is a small letter "; else if (ch>=48 && ch<=57) cout<<" Character is a digit "; else if ((ch>0 && ch<=47)||(ch>=58 && ch<=64)||(ch>=91 && ch<=96)||(ch>=123 && ch<=127)) cout<<" Character is a special symbol "; getch(); return 0; }

  The marks obtained by a student in 5 different subjects are input by the user. The student gets a division as per the following rules: Percentage above or equal to 60 - First division Percentage between 50 and 59 - Second division Percentage between 40 and 49 - Third division Percentage less than 40 – Fail #include<iostream.h> #include<conio.h> int main() { int sub1,sub2,sub3,sub4,sub5,percentage; cout<<" Enter marks of five subjects : "; cin>>sub1>>sub2>>sub3>>sub4>>sub5; percentage=(sub1+sub2+sub3+sub4+sub5)/5; if (percentage>=60) cout<<" Ist division "; else if (percentage>=50) cout<<" IInd division "; else if (percentage>=40) cout<<" IIIrd division "; else cout<<" Fail " ; getch(); return 0; }

  #include<iostream.h> #include<conio.h> #include<math.h> void main() { float a,b,c,d,root1,root2; cout<<" Enter value of a, b and c : "; cin>>a>>b>>c; d=b*b-4*a*c; if (d==0) { root1=(-b)/(2*a); root2=root1; cout<<" Roots are real & equal "; } else if (d>0) { root1=-(b+sqrt(d))/(2*a); root2=-(b-sqrt(d))/(2*a); cout<<" Roots are real & distinct "; } else { root1=(-b)/(2*a); root2=sqrt(-d)/(2*a); cout<<" Roots are imaginary "; } cout<<" \nRoot 1= "<<root1<<" \nRoot 2= "<<root2; getch(); } Output: Enter value of a, b and c : 1.0 -10.0 25.0 Roots are real & equal Root 1= 5 Root 2= 5

  #include<iostream.h> #include<conio.h> void main() { int calls; float bill; cout<<" Enter number of calls : "; cin>>calls; if (calls<=100) bill=200; else if (calls>100 && calls<=150) { calls=calls-100; bill=200+(0.60*calls); } else if (calls>150 && calls<=200) { calls=calls-150; bill=200+(0.60*50)+(0.50*calls); } else { calls=calls-200; bill=200+(0.60*50)+(0.50*50)+(0.40*calls); } cout<<" Your bill is Rs. "<<bill; getch(); }   Output: Enter number of calls : 190 Your bill is Rs.250

  #include<iostream.h> #include<conio.h> int main() { int ang1,ang2,ang3; cout<<" Enter the three angles of triangle: "; cin>>ang1>>ang2>>ang3; if (ang1+ang2+ang3==180) cout<<" Triangle is valid "; else cout<<" Triangle is not valid "; getch(); return 0; }

  #include<iostream.h> #include<conio.h> void main() { int raj_age,sumit_age,amit_age; cout<<" Enter Raj age: "; cin>>raj_age; cout<<" Enter Sumit age: "; cin>>sumit_age; cout<<" Enter Amit age: "; cin>>amit_age; if (raj_age<sumit_age && raj_age<amit_age) cout<<" Raj is youngest "; else if (sumit_age<raj_age && sumit_age<amit_age) cout<<" Sumit is youngest "; else cout<<" Amit is youngest "; getch(); }

  #include<iostream.h> #include<conio.h> void main() { int cp,sp,result; cout<<" Enter cost price of item : "; cin>>cp; cout<<" Enter selling price of item : "; cin>>sp; result=sp-cp; if (result>0) cout<<" Profit : "<<result; else if (result<0) cout<<" Loss : "<<-(result); else cout<<" No profit no loss "; getch(); }

  #include<iostream.h> #include<conio.h> void main() { int totalexp, qty, price, discount; cout<<" Enter quantity: "; cin>>qty; cout<<" Enter price: "; cin>>price; totalexp=qty*price; if (totalexp>7000) { discount=(totalexp*0.1); totalexp=totalexp-discount; } cout<<" Total Expense is Rs. "<<totalexp; getch(); }

  #include<iostream.h> #include<conio.h> class time { private : int hours; int minutes; public : void settime( int h, int m) { hours=h; minutes=m; } time sum(time); void showtime(); }; time time::sum(time TM) { time t; t.minutes = minutes + TM.minutes; t.hours=t.minutes/60; t.minutes=t.minutes%60; t.hours += hours + TM.hours; return t; } void time::showtime() { cout<<hours<<" hours and "<<minutes<<" minutes "<<endl; } void main() { time T1,T2,T3; T1.settime(2,45); T2.settime(3,30); T3=T1.sum(T2); cout<<" \n Time 1 : ";T1.showtime(); cout<<" \n Time 2 : ";T2.showtime(); cout<<" \n Time 3 : ";T3.showtime(); getch(); }

  #include<iostream.h> #include<conio.h> class Distance { private : int feet; float inches; public : void setdist( int ft, float in) { feet=ft; inches=in; } Distance add(Distance); void disp(); }; Distance Distance::add(Distance D) { Distance t; t.inches=inches + D.inches; t.feet =0; if (t.inches>=12.0) { t.inches-=12.0; t.feet++; } t.feet +=feet + D.feet; return t; } void Distance::disp() { cout<<feet<<" \' "<<inches<<" \" "; } void main() { Distance d1,d2,d3; d1.setdist(10,7.1); d2.setdist(23,5.5); d3=d1.add(d2); cout<<" \n distance 1 = ";d1.disp(); cout<<" \n distance 2 = ";d2.disp(); cout<<" \n distance 3 = ";d3.disp(); getch(); }

  #include<iostream.h> #include<conio.h> class complex { private : float x; float y; public : void set( float real, float img) { x=real; y=img; } complex sum(complex); void display(); }; complex complex::sum(complex C) { complex t; t.x = x + C.x; t.y = y + C.y; return t; } void complex::display() { cout<<x<<" + j "<<y<<endl; } void main() { complex C1,C2,C3; C1.set(2.5,7.1); C2.set(4.2,5.5); C3=C1.sum(C2); cout<<" \n complex Number 1 = ";C1.display(); cout<<" \n complex Number 2 = ";C2.display(); cout<<" \n complex Number 3 = ";C3.display(); getch(); }

  #include<iostream.h> #include<conio.h> class Rectangle { private : float length; float width; public : void setlength( float ); void setwidth( float ); float perimeter(); float area(); void show(); int sameArea(Rectangle); }; void Rectangle::setlength( float len) { length = len; } void Rectangle::setwidth( float wid) { width = wid; } float Rectangle::perimeter() { return (2 * length + 2 * width); } float Rectangle::area() { return length * width; } void Rectangle::show() { cout << " Length: " << length << " Width: " << width; } int Rectangle::sameArea(Rectangle other) { float areaf = length * width; float areas = other.length * other.width; if (areaf == areas) return 1; return 0; } void main() { Rectangle first; Rectangle second; first.setlength(5); first.setwidth(2.5); second.setlength(5); second.setwidth(18.9); cout << " First rectangle: