Introduction to Programming

1. Introduction to Programming Lecture 4

3. Key Words of C • main • if • else • while • do • for

4. Memory

5. Memory x = 2 + 4 ; = 6 ;

6. Memory x = 2 + 4 ; = 6 ;

7. Memory a b x = a + b ; x

8. #include<iostream.h> void main() { int x=10; cout<<"the value of x is="; cout<<x<<endl; }

9. #include<iostream.h> void main() { int x; cout<<"enter the value of x"; cin>>x; }

10. #include<iostream.h> void main() { intx; inty; intz; cout<<"enter the value of x"; cin>>x; cout<<endl; cout<<"enter the value of y"; cin>>y; cout<<endl; z=x+y; cout<<"the answer is"; cout<<z; }

11. Quadratic Equation • In algebra y = ax2 + bx + c • In C y = a*x*x + b*x + c

12. a*b%c +d

13. a*(b%c) = a*b%c • ?

14. b2 - 2a 4c = b*b - 4*a*c /2 *a Incorrect answer Solution = (b*b - 4*a*c) /(2 *a) Correct answer

15. No expression on the left hand side of the assignment • Integer division truncates fractional part • Liberal use of brackets/parenthesis

16. TASK • Calculate average of the ages of three persons by using cin>>

17. #include <iostream.h> main ( ) { int age1, age2, age3, age4, age5, age6, age7, age8, age9, age10 ; intTotalAge ; intAverageAge ; cout << “ Please enter the age of student 1: “ ; cin >> age1 ; cout << “ Please enter the age of student 2: “ ; cin >> age2 ; : : TotalAge = age1+ age2 + age3+ age4+ age5+age6+ age7+ age8+age9 +age10 ; AverageAge = TotalAge / 10 ; cout<< “The average age of the class is :” << AverageAge ; }