include <iostream>
#include <cmath>
using namespace std;
int main()
{
double a, b, c, r1, r2, disc;
cout << "Please enter three number:";
cin >> a >> b >> c;
if (( a == 1 || a == -1 || a == 2) && (b >= -2 && b<=5) && (c>= -4 && c <= 4)){
cout << endl << endl;}
else
cout << endl << "Please exit program and re-enter new number" << endl << endl; // Exit program if this output display.
system("pause");
cout << "\n" << "a" << "\t" << "b" << "\t" << "c" << endl << "\n" ;
cout << a << "\t" << b << "\t" << c << endl << "\n";
cout.setf(ios::fixed,ios::floatfield);
cout.precision(3);
disc = sqrt (pow (b,2) - (4.0 * a * c));
cout << endl << "Discriminate" << endl << endl << disc << endl << endl;
r1 = ((-b + disc ) / (2.0*a));
r2 = ((-b - disc ) / (2.0*a));
if (disc >= 0) {
cout << "Root 1" << "\t" << "Root 2" << endl << endl;
cout << r1 << "\t" << r2; }
else
cout << "No Solution";
cin >> r1 >> r2 >> disc;
return 0;
}
How to make the program exit by itself when a, b, and c is not equal to the variable I declared?
If I put a pause, it will stop the program from running to the next if statement, however, if a,b, and c is the correct variable, it will also pause. So I find it impractical. Is there a way to make it exit when a,b, and c is not equal to the variable I declared and run the entire program if a, b, and c is the correct variable?
Answers & Comments
Verified answer
If your if statement isn't true, then you want to do 3 different things in your else part, right?
You want to:
Print an error message.
Run Pause
Exit the program.
When you need to do more than 1 thing in the if or else part of an if/else, you need to put braces around the code. (Actually, it is good practice to ALWAYS put in the braces, even if you are only doing 1 thing).
So, you add the braces:
else
{
}
Then you fill in what you need to do:
else
{
cout << endl << "Please exit program and re-enter new number" << endl << endl;
system("pause");
return 1;
}
Note: You could also use return 0, but it is a good idea NOT to return 0 when the program fails. 0 traditionally means SUCCESS.
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