63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
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/* Quadratic Equation - Program to find roots of a quadartic equation */
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#include <stdio.h>
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#include <conio.h>
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#include <math.h> /* for sqrt() */
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#include <stdlib.h> /* for abs() */
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void main()
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{
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float a, b, c, d, r, r1, r2, real, imag ;
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clrscr() ;
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printf("Enter three co-efficients: ") ;
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scanf("%f %f %f", &a, &b, &c) ;
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d=b*b-4*a*c ;
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if(d==0)
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{
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printf("Root is real \n") ;
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printf("Root is %f \n", -b/(2*a) ) ;
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}
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else if(d>0)
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{
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printf("Roots are real \n") ;
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r=sqrt(d) ;
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r1=(-b+r)/(2*a) ;
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r2=(-b-r)/(2*a) ;
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printf("Roots are %f and %f \n", r1, r2) ;
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}
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else
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{
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printf("Roots are imaginary \n") ;
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r=sqrt(-d);
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real=-b/(2*a) ;
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imag=r/(2*a) ;
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printf("Root1= %f + %f i \n", real, imag) ;
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printf("Root2= %f - %f i \n", real, imag) ;
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}
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getch() ;
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}
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/*
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Output 1:
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Enter three co-efficients: 1 2 1
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Root is real
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Root is -1.000000
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Output 2:
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Enter three co-efficients: 3 4 1
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Roots are real
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Roots are -0.333333 and -1.000000
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Output 3:
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Enter three co-efficients: 2 2 1
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Roots are imaginary
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Root1= -0.500000 + 0.500000 i
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Root2= -0.500000 - 0.500000 i
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*/
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