Bissection Method, Fortran

Bissection Method

PROGRAM Bisection_Method        
    IMPLICIT NONE        
    REAL::a,b,c,ero,f        
    ero = 0.00001        
    !WRITE(*,*)"Enter Value of a="        
    !READ(*,*) a        
    !WRITE(*,*)"Enter Value of b="        
    !READ(*,*)b       
    a=1.0
    b=3.0
    IF (f(a)==0)THEN                
        WRITE(*,*)"Root of the given equation is : ",a       
    ELSEIF (f(b)==0) THEN                
        WRITE(*,*)"Root of the given equation is :",b       
    ELSEIF (f(a)*f(b)>0) THEN
        WRITE(*,*)"Root(s) of the given equation doesn't existbetween",a,"and",b       
    ELSE
        DO WHILE ((b-a)>ero)     
            c=(a+b)/2
            IF(f(c)==0)THEN
                EXIT
            ELSEIF(f(a)*f(c)<0)THEN 
                b=c
            ELSE
                a=c
            END IF
        END DO               
        WRITE(*,*)"Root of the given equation is :",c    
     END IF   
END PROGRAM
Function f(x)        
    IMPLICIT NONE        
    REAL::f,x        
    f = x**3-2*x-5   
End Function


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