Q. Write a c program to find the roots of a quadratic equation.
Q. Write a c program to solve quadratic equation.
SOLUTION :
#include<stdio.h> # include <conio.h> #include<math.h> void main(){ float a,b,c; float d,root1,root2; printf("\n Enter the values of A : ") ; scanf("%f", &a) ; printf("\n Enter the values of B : ") ; scanf("%f", &b) ; printf("\n Enter the values of C : ") ; scanf("%f", &c) ; d = b * b - 4 * a * c; if(a != 0){ if(d < 0){ printf("\n RESULT : \n Roots are complex/imaginary number.\n"); printf(" Roots of quadratic equation are: "); printf("\n Root-1 = %.3f%+.3fi",-b/(2*a),sqrt(-d)/(2*a)); printf("\n Root-2 = %.3f%+.3fi",-b/(2*a),-sqrt(-d)/(2*a)); return 0; } else if(d==0){ printf("\n RESULT : \n Both roots are real numbers and equal.\n"); root1 = -b /(2* a); printf(" Root of quadratic equation is:\n Root-1 = Root-2 = %.3f ",root1); return 0; } else if(d > 0){ printf("\n RESULT : \n Roots are real numbers and unequal.\n"); root1 = ( -b + sqrt(d)) / (2* a); root2 = ( -b - sqrt(d)) / (2* a); printf(" Roots of quadratic equation are:\n Root-1 = %.3f , Root-2 = %.3f",root1,root2); } } else printf("\n RESULT :\n Equation is linear."); getch(); }
By using SWITCH case :
SOLUTION :
# include <stdio.h> # include <conio.h> # include <math.h> void main() { float a, b, c, d, real, imag, root1, root2, n ; int k ; printf("\n Enter the values of A : ") ; scanf("%f", &a) ; printf("\n Enter the values of B : ") ; scanf("%f", &b) ; printf("\n Enter the values of C : ") ; scanf("%f", &c) ; if(a != 0){ d = b * b - 4 * a * c ; if(d < 0) k = 1 ; if(d == 0) k = 2 ; if(d > 0) k = 3; switch(k){ case 1 : printf("\n RESULT : \n Roots are complex/imaginary number.\n"); printf(" Roots of quadratic equation are: "); printf("\n Root-1 = %.3f%+.3fi",-b/(2*a),sqrt(-d)/(2*a)); printf("\n Root-2 = %.3f%+.3fi",-b/(2*a),-sqrt(-d)/(2*a)); break ; case 2 : printf("\n RESULT : \n Both roots are real numbers and equal.\n"); root1 = -b /(2* a); printf(" Root of quadratic equation is:\n Root-1 = Root-2 = %.3f ",root1); break ; case 3 : printf("\n RESULT : \n Roots are real numbers and unequal.\n"); root1 = ( -b + sqrt(d)) / (2* a); root2 = ( -b - sqrt(d)) / (2* a); printf(" Roots of quadratic equation are:\n Root-1 = %.3f , Root-2 = %.3f",root1,root2); break ; } } else printf("\n RESULT :\n Equation is linear.") ; getch() ; }
OUTPUT OF SOLUTION :
do u have c program on pattern mention below
*
12
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1234
*******
123456
How to test this program in software engineering
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