Question

Driving is expensive. Write a program with a car's miles/gallon and gas dollars/gallon (both doubles) as input, and output the gas cost for 10 miles, 50 miles, and 400 miles. Output each floating-point value with two digits after the decimal point, which can be achieved as follows: printf("%0.2of", your Value);

Answer 1

Answer:

def driving_cost(driven_miles, miles_per_gallon, dollars_per_gallon):

  gallon_used = driven_miles / miles_per_gallon

  cost = gallon_used * dollars_per_gallon  

  return cost  

miles_per_gallon = float(input(""))

dollars_per_gallon = float(input(""))

cost1 = driving_cost(10, miles_per_gallon, dollars_per_gallon)

cost2 = driving_cost(50, miles_per_gallon, dollars_per_gallon)

cost3 = driving_cost(400, miles_per_gallon, dollars_per_gallon)

print("%.2f" % cost1)

print("%.2f" % cost2)

print("%.2f" % cost3)

Explanation:

Answer 2

Answer:

The C program is given below.

#include<stdio.h>

int main() {

   double speed, gas_cost, cost_1, cost_10, cost_50, cost_400;    

   printf("Enter car's speed in miles/gallon  ");

   scanf("%lf", &speed);    

   printf("Enter cost of gas in dollars/gallon  ");

   scanf("%lf", &gas_cost);    

   // fraction gives the gallons of gas needed for 1 mile.

   // gallons of gas needed for 1 mile * cost of 1 gallon of gas = gas cost for 1 mile

   cost_1 = (1/speed)*gas_cost ;    

   // cost of gas for 10 miles

   cost_10 = cost_1 * 10;

   printf("Cost of gas for 10 miles in dollars is  ");

   printf( "%0.2f", cost_10 );

   printf("\n");    

   // cost of gas for 50 miles

   cost_50 = cost_1 * 50;

   printf("Cost of gas for 50 in dollars miles is  ");

   printf( "%0.2f", cost_50 );

   printf("\n");    

   // cost of gas for 400 miles

   cost_400 = cost_1 * 400;

   printf("Cost of gas for 400 in dollars miles is  ");

   printf( "%0.2f", cost_400 );

   printf("\n");    

   return 0;

}

OUTPUT

Enter car's speed in miles/gallon  20                                                                                          

Enter cost of gas in dollars/gallon  30                                                                                        

Cost of gas for 10 miles in dollars is  15.00                                                                                  

Cost of gas for 50 in dollars miles is  75.00                                                                                  

Cost of gas for 400 in dollars miles is  600.00  

Explanation:

This program takes user input for cost of gas in dollars and speed of the car in miles per gallon.

Next, gallons needed for 1 mile is calculated.  

cost_1 = (1/speed)*gas_cost ;

Following this, gallons needed for 10 miles, 50 miles and 400 miles are calculated.

cost_10 = cost_1 * 10;

cost_50 = cost_1 * 50;

cost_400 = cost_1 * 400;

These values are displayed on the screen with two decimal places by using printf( "%0.2f", your_value).

All the variables needed in this program are declared as double.

All the instructions mentioned have been implemented. This program can be tested for all possible positive numbers.