how can i assign a negative value to an integer using console.readline()? -

how can i assign a negative value to an integer using console.readline()? -

class="lang-cs prettyprint-override"> using system; namespace consoleapplication1 { class programme { static void main(string[] args) { int x1, x2, a, b,c,sum; double delta; console.writeline("dati coeficientii ecuatiei de gradul doi ax^2+bx+c"); = convert.toint32(console.readline()); //same int.parse(console.readline()); b = convert.toint32(console.readline()); c = convert.toint32(console.readline()); sum=(b*b)+(-4)*(a*c); console.writeline("{0}",sum); //delta = (-b + math.sqrt(sum))/(2*a); // console.writeline("{0}",delta); console.readkey(); } } }

im trying set negative value local variable sum, reads unsigned number. looks takes negative value not compatible value.

please suggest.

console.readline