Does anyone know any websites or books which i can refer to for guidiance with reference to my C program of which i am using to test for flow in a square cavity?

there's a good online C book here:

http://www.cm.cf.ac.uk/Dave/C/CE.html

To test your results, you can use this reference:

@ARTICLE(dev1983a, AUTHOR = " G. De Vahl Davis", TITLE = " Natural convection of air in a square cavity : a comparaison exercise", PAGES = " 227--248", JOURNAL = IJNMF, YEAR = 1983, VOLUME = 3)

@ARTICLE(dev1983b, AUTHOR = " G. De Vahl Davis", TITLE = " Natural convection of air in a square cavity : a benchmark solution", PAGES = " 249--264", JOURNAL = IJNMF, YEAR = 1983, VOLUME = 3)

IJNMF stands for "International journal for numerical methods in fluids"

@ARTICLE(ghia1982 AUTHOR = " U. Ghia, K. N. Ghia, C. T. Shin", TITLE = " High-Re Solutions for Incompressible Flow using the Navier-Stokes Equations and a Multigrid Method" PAGES = " 387--411", JOURNAL = JCP, YEAR = 1982, VOLUME = 48)

JCP stands for "Journal of Computational Physics"