Code Help

[tnt980]

i need the code to have the user input a number and have it say an error if it is not positive. heres my code

#include <iostream>
#include <sstream>

using namespace std;

int Persistent(int value)
{

int counter = 0;

while (value > 10)
{
int newvalue = 1;
int tmpvalue = value;


while (tmpvalue > 0)
{	
// I get the last digit
int tmp = tmpvalue % 10;
newvalue *= tmp;
// last digit is cut
tmpvalue /= 10;
}
value = newvalue;
cout << "element: " << value << endl;
counter++;	
}

return counter;

}

int main()
{
    
    cout << "Please enter a Non - Negative Number";
    
int originalNumber = 715;
cout << "original number: " << originalNumber << endl;
cout << " number of element: " << Persistent(83);
return 0;
}

[YFGHNG]

Use cin.

Also you can create an if/else to check for negativity or zero case:

// pseudocode
if number is negative
    do something
else if number is 0
    do another thing
else
    continue to main program

[tnt980]

how would i implement it in code

[chicofeo]

Below is an example of the while loop use for validation:

#include <iostream>
using namespace std;

int main()
{
	int number{ 0 };

	cout << "Please enter a number (0-100)" << endl;
	cin >> number;

	while (number < 0 || number > 100) 
	{
		cout << "Your input " << number << " is incorrect" << endl;
		cout << "Try again" << endl;
		cout << "Please enter a number (0-100)" << endl;
		cin >> number;
	}

	return 0;

}

If you don't know how to use the while loop, then I recommend using the if statement. However, for the if statement, it will check for the wrong input and let the user know only once.

[48T7M4Gy]

Large team of volunteers working on this project for OP all over the place

http://www.cplusplus.com/forum/general/177311/
http://www.cplusplus.com/forum/beginner/177290/
http://www.cplusplus.com/forum/beginner/177321/

[tnt980]

so how will do code look with that

[48T7M4Gy]

Even even Larger team of volunteers working on this project for OP all over the place

http://www.cplusplus.com/forum/general/177311/
http://www.cplusplus.com/forum/beginner/177290/
http://www.cplusplus.com/forum/beginner/177321/
http://www.cplusplus.com/forum/beginner/177330/
http://www.cplusplus.com/forum/beginner/177327/

[chicofeo]

@ kemort, thanks for the heads up!
@ OP, thanks for wasting my time.

[48T7M4Gy]

@chicofeo ;)