# Chapter 4 - Arithmetic Operators¶

## example 4.1, page no. 82¶

In :
print "Enter number of preregistered students: ",
total = int(raw_input())
print "Enter number of students adding the course: ",
added = int(raw_input())
total = total + added
print "Total number of students: ", total

Enter number of preregistered students: 35
Enter number of students adding the course: 3
Total number of students:  38


## example 4.2, page no. 84¶

In :
firstName = "Jeff"
lastName = "Kent"
print "Your name is ", firstName + lastName

Your name is  JeffKent


## example 4.3, page no. 84¶

In :
print "Enter number of preregistered students: ",
total = int(raw_input())
print "Enter number of students adding the course: ",
added = int(raw_input())
total = total + added
print "How many students dropped? ",
dropped = int(raw_input())
total -= dropped
print "Total number of students: ", total

Enter number of preregistered students: 30
Enter number of students adding the course: 3
How many students dropped? 5
Total number of students:  28


## exampe 4.4, page no. 85¶

In :
print "Enter number of preregistered students: ",
total = int(raw_input())
print "Enter number of students adding the course: ",
added = int(raw_input())
total = total + added
print "How many students dropped? ",
dropped = int(raw_input())
total -= dropped
print "Total number of students: ", total
print "Total tuition owed: $",((total + dropped) * 72)  Enter number of preregistered students: 30 Enter number of students adding the course: 3 How many students dropped? 5 Total number of students: 28 Total tuition owed:$ 2376


## example 4.5, page no. 88¶

In :
firstOp = 10
secondOp = 4
result = firstOp / secondOp
print firstOp, " / ", secondOp, " = ", result

10  /  4  =  2


## example 4.6, page no. 88¶

In :
firstOp = 10.0
secondOp = 4.0
result = firstOp / secondOp
print firstOp, " / ", secondOp, " = ", result

10.0  /  4.0  =  2.5


## example 4.7, page no. 89¶

In :
firstOp = 10
secondOp = 4
result = float(firstOp) / float(secondOp) #converting both the variables to float
print firstOp, " / ", secondOp, " = ", result

10  /  4  =  2.5


## example 4.8, page no. 89¶

In :
print "Enter number of preregistered students: ",
total = int(raw_input())
print "Enter number of students adding the course: ",
added = int(raw_input())
total = total + added
print "How many students dropped? ",
dropped = int(raw_input())
total -= dropped
print "Total number of students: ", total
tuition = (total + dropped) * 72
print "Total tuition owed: $",tuition print "Average tuition per enrolled student:$", (float(tuition)/float(total))

Enter number of preregistered students: 30
Enter number of students adding the course: 3
How many students dropped? 5
Total number of students:  28
Total tuition owed: $2376 Average tuition per enrolled student:$ 84.8571428571


## example 4.9, page no. 91¶

In :
print "Enter radius of circle: ",
radius = float(raw_input())
area = 3.14159 * pow(radius, 2);
print "The area is ", area

Enter radius of circle: 6
The area is  113.09724


## example 4.10, page no. 92¶

In :
print "Enter number of pennies to make change for: ",
total = int(raw_input())
dollars = total / 100
leftover = total % 100
quarters = leftover / 25
leftover %= 25
dimes = leftover / 10
leftover %= 10
nickels = leftover / 5
leftover %= 5
print "Dollars: ", dollars
print "Quarters: ", quarters
print "Dimes: ", dimes
print "Nickels: ", nickels
print "Pennies: ", leftover

Enter number of pennies to make change for: 387
Dollars:  3
Quarters:  3
Dimes:  1
Nickels:  0
Pennies:  2

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