quadratic-equation.c (993B)
1 #include <stdio.h> 2 #include <math.h> 3 4 5 void linearEquation(); 6 void quadraticEquation(); 7 8 9 int main(int argc, char **argv) 10 { 11 double a, b, c; 12 13 printf("a: "); 14 scanf("%lf", &a); 15 printf("b: "); 16 scanf("%lf", &b); 17 printf("c: "); 18 scanf("%lf", &c); 19 20 if (a != 0) 21 quadraticEquation(a, b, c); 22 else 23 linearEquation(b, c); 24 25 return 0; 26 } 27 28 29 void linearEquation(double b, double c) 30 { 31 double x; 32 33 if (b != 0) 34 { 35 x = -c / b; 36 printf("x = %.2lf\n", x); 37 } 38 else 39 printf("Infinite solutions.\n"); 40 } 41 42 43 void quadraticEquation(double a, double b, double c) 44 { 45 double x, x1, x2, D = pow(b, 2) - 4*(a*c); 46 47 if (D > 0) 48 { 49 x1 = (-b + sqrt(D)) / (2*a); 50 x2 = (-b - sqrt(D)) / (2*a); 51 printf("x1 = %.2lf\nx2 = %.2lf\n", x1, x2); 52 } 53 else if (D == 0) 54 { 55 x = (-b) / (2*a); 56 printf("x = %.2lf\n", x); 57 } 58 else 59 { 60 printf("There are no solutions.\n"); 61 } 62 }