**zero_itp_test**,
a Fortran90 code which
calls zero_itp(), which
finds a zero of a scalar function of a scalar variable,
starting from a change of sign interval, using the
Interpolate/Truncate/Project (ITP) method, which has
faster convergence than the bisection method.

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zero_itp, a Fortran90 code which finds a zero of a scalar function of a scalar variable, starting from a change of sign interval, using the Interpolate/Truncate/Project (ITP) method, which has faster convergence than the bisection method.

- zero_itp_test.f90, calls all the tests.
- zero_itp_test.sh, runs all the tests.
- zero_itp_test.txt, the output file.