roots of quadratic equation in c

/************************************************************* * File : program-to-find-out-roots-of-quadratic-equation.c * Author : Saurabh Gupta * Desc : roots of quadratic equation c program * Source : http://saurabhgupta0527.blogspot.com/p/c.html * Created : PM 02:24 17 September 2011 *************************************************************/ #include <stdio.h> #include <math.h> int main() { printf ("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"); printf ("XXXXXXXX roots of Quadratic Equation XXXXXXXX\n"); printf ("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"); float nQuadraticCoefficient, nLinearCoefficient, nConstantTerm, nRoots, r1, r2, r3, r4, r5; printf ("Enter the three constant values of Quadratic Equation\n"); scanf("%f %f %f",&nQuadraticCoefficient,&nLinearCoefficient,&nConstantTerm); /* * This will calculate the roots */ nRoots = (nLinearCoefficient*nLinearCoefficient)-(4*nQuadraticCoefficient*nConstantTerm); if(nRoots < 0) { printf("The roots are complex\n"); r4 = -nLinearCoefficient/(2*nQuadraticCoefficient); r5 = sqrt(-nRoots)/(2*nQuadraticCoefficient); printf("The roots are %f + i %f \n",r4,r5); printf("%f - i%f \n",r4,r5); } else if (nRoots == 0) { printf("The roots are real and equal\n"); r1 = -nLinearCoefficient/(2*nQuadraticCoefficient); printf("The root is %f\n",r1); } else { printf("The roots are real and equal\n"); r2 = (-nLinearCoefficient+sqrt(nRoots))/(2*nQuadraticCoefficient); r3 = (-nLinearCoefficient-sqrt(nRoots))/(2*nQuadraticCoefficient); printf("The roots are %f %f\n",r2,r3); } printf ("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"); return 0; } /* * OUTPUT * [sgupta@rhel54x64 c]$ gcc -c program-to-find-out-roots-of-quadratic-equation.c [sgupta@rhel54x64 c]$ gcc -o program-to-find-out-roots-of-quadratic-equation program-to-find-out-roots-of-quadratic-equation.o -lm [sgupta@rhel54x64 c]$ ./program-to-find-out-roots-of-quadratic-equation XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXX roots of Quadratic Equation XXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Enter the three constant values of Quadratic Equation 2 4 2 The roots are real and equal The root is -1.000000 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX [sgupta@rhel54x64 c]$ */ See also
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