Question1(b), Fortran

Question1(b)

program false

implicit none

real::a,b,f,x,tol,xv

integer::itrtn,i

print*, "Enter the initial values (a,b):"

read(*,*)a,b

if( (f(a)*f(b)) .gt.0) then

write(*,*)"Can not be done", f(a), f(b);

stop

end if

print*, "Enter the number of iteration:"

read(*,*)itrtn

print*, "Enter the tolerance:"

read(*,*)tol

do 10 i = 1, itrtn

xv = (a * f(b) - b* f(a)) / (f(b)-f(a))

if(f(xv).eq.0) then

print*,"The soln is: ",xv

stop

end if

if(f(a)*f(xv).le.0) then

b = xv

print*,a,b

else

a = xv

print*,a,b

end if

if(abs(a-b).le.tol) then

print*, "The approximate soln is: ",xv

stop

end if

10 continue

print*,"Maximum iteration failed"

end program

real function f(x)

real::x

f = x**3 - 2*x -5

return

end function


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