For problems with strong singularities, C oscillations etc. One measure C of the reliability of DQNC79 is the output parameter K, C giving the number of integrand evaluations that were needed. C ERR - is a requested error tolerance. C 1 ANS most likely meets requested error tolerance. C allow normal integration.
ANS is set to zero.
C 2 ANS probably does not meet requested error tolerance. C K - the number of function evaluations actually used to do C the integration. C DQNC79 will gracefully give up if K exceeds 2000. Removed unnecessary intrinsics. Prologue converted to Version 4.0 format.