Console Application HELP

Guest User

Hi everyone

This is my question HELP please...

Write an algorithm to fill 6 positions in a vector, integer, values between 20 and -20, and the print on the screen. Then will be shown how many numbers read are positive values.

The output must be like this:

Insert an value between 20 and -20: -10

Insert an value between 20 and -20: 8

Insert an value between 20 and -20: 9

Insert an value between 20 and -20: 10

Insert an value between 20 and -20: 5

Insert an value between 20 and -20: 6

Inserted numbers

Inserted Value: -10

Inserted Value: 8

Inserted Value: 9

Inserted Value: 10

Inserted Value: 5

Inserted Value: 6

-> There are 5 positive values

4 Replies

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Vulpes12y ago
Accepted answer
Try:

using System;

class Program
{
static void Main()
{
Console.Clear();
int[] vector = new int[6];

for(int i = 0; i < 6; i++)
{
Console.Write("Insert a value between 20 and -20 : ");
bool isValid = int.TryParse(Console.ReadLine(), out vector[i]);
if(!isValid || vector[i] < -20 || vector[i] > 20)
{
Console.WriteLine("\nMust be an integer between -20 and 20. Try again\n");
--i;
}
}

Console.WriteLine("\nInserted numbers\n");

int numPositive = 0;

for(int i = 0; i < 6; i++)
{
Console.WriteLine(" Inserted Value: {0}", vector[i]);
if (vector[i] > 0) numPositive++;
}

Console.WriteLine("\n-> There are {0} positive values", numPositive);
Console.ReadKey();
}
}
Guest User12y ago
Thanks soo Much :D
Vulpes12y ago
Sure, the int.TryParse() method checks whether the first argument can be converted to an int.

If it can, then the method returns true and the value is assigned to the 'out' parameter.

If it can't, then the method returns false and 0 is assigned to the 'out' parameter.

So, if this method return returns false (because the user enters 'abc' say) or if it returns an int which is less than -20 or more than 20, we print an error message and ask the user to re-input the number.

It's just an easy way to validate input.
Guest User12y ago
Thanks its perfect :)

but can you explain this part thanks

bool isValid = int.TryParse(Console.ReadLine(), out vector[i]);
if(!isValid || vector[i] < -20 || vector[i] > 20)