fix modf error

headers/computorv1.h

@@ -122,6 +122,8 @@ typedef enum
 
 typedef struct
 {
+    double a;                 // a in "ax + b"
+    double b;                 // b in "ax + b"
     int solution_gcd;         // gcd(b, a)
     int solution_numerator;   // -b / gcd
     int solution_denominator; //  a / gcd
@@ -130,6 +132,9 @@ typedef struct
 
 typedef struct
 {
+    double a;                    // a in "ax² + bx + c"
+    double b;                    // b in "ax² + bx + c"
+    double c;                    // c in "ax² + bx + c"
     e_delta_sign delta_sign;     // DELTA_PLUS or DELTA_MINUS or DELTA_ZERO
     double delta_absolute;       // |Δ| == |b² - 4ac|
     double delta_sqrt;           // √|Δ|