Initial commit

ifelse.m

@@ -0,0 +1,15 @@
+% x=input('please type a number \n');
+% if fix(x) == x
+%     disp(x);
+% end
+
+a = input('a=?');
+b = input('b=?');
+c = input('c=?');
+d = b * b - 4 * a * c ;
+if d > 0
+    x = [(-b + sqrt(d))/(2 * a),(-b - sqrt(d))/(2 * a)];
+    disp(['x1=',num2str(x(1)),'x2=',num2str(x(2))]);
+else
+    disp('无解！！！ 请重新输入');
+end