else d < 0
{ printf ( " Roots ▁ are ▁ complex ▁ STRNEWLINE " ) ; printf ( " % f ▁ + ▁ i % f % f - i % f " , - ( double ) b / ( 2 * a ) , sqrt_val / ( 2 * a ) , - ( double ) b / ( 2 * a ) , sqrt_val / ( 2 * a ) ; } }