Thread: for loop with random numbers

Assume that vehicles are going through a two-way traffic intersection. There are three types of vehicles: car, motor bikes and trucks. Generate a series of 10 random integers, between 1 and 3, inclusive. The numbers represent the type of vehicle as stated below:

Number Vehicle Category
1 Car
2 Motor bikes
3 Trucks

Write a program, using a for loop, to count how many vehicles going through the traffic intersection are cars, motor bikes and trucks. Then, the program should print out the numbers for each vehicle category. There is no user input for this program. How do i do it so they will add up the sum of each vehicle? Thank you.

The answer should be something like
Number of cars = X
Number of motor bikes = Y
Number of Trucks = Z

but i'm getting
Total number of vehicle:
cars
motorbikes
motorbikes
cars
Trucks
Trucks
motorbikes
motorbikes
Trucks
cars

public static void main(String[] args) {
int countCar = 0;
int countBike = 0;
int countTruck = 0;
int all=0;



for (int series = 1; series<=10; series++) {


all = (int) (Math.random()*3)+1;


if (all==1)
{
System.out.println(" cars " );
}
else if (all==2)
{
System.out.println(" motorbikes " );
}
else if (all==3)
{
System.out.println(" Trucks " );
}
}
}
}

You should change the content of your conditions to countXxx++

ex. if your vehicle code for truck is 3 then add 1 to countTruck

then at the end of the for loop, thats where you print the counters

Sorry but i don't understand. Is there anyone who're willing to write a similar java code so i can learn better. Basically the for loop is used because the question asked me to generate a series of 10 random intergers = for (int series = 1; series<=10; series++) {
then there will generate a number between 1 and 3 with all = (int) (Math.random()*3)+1; or i have to do them individually? like countCar = (int) (Math.random()*3)+1; etc etc and that's all i can do.

1. how do i summaries the 10 generated code example instead of cars motorbikes motorbikes cars Trucks Trucks motorbikes motorbikes Trucks cars, i get 3 cars, 3 trucks and 4 bikes?

so the answer will be
Number of cars = 3
Number of motor bikes = 4
Number of Trucks = 4

sorry if i'm asking alot.

Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

Please post your code correctly per the above link.

Write out the steps your program needs to accomplish and code them one at a time, testing each step as you go. I recommend you start by generating 10 random numbers with values 1 through 3, inclusive. Once you have that, you can increment a counter for each type of vehicle based on the value of each random number generated. There are a few steps after that, but you can work them out.

Come back when you've made some progress and need help.