! Program to test string handlingprogram stringimplicit nonecharacter(len=5)::a,bcharacter(len=20)::ca='Hello'b='World'c=a//bif(c.ne.'HelloWorld')call abortif(c.eq.'WorldHello')call abortif(a//'World'.ne.'HelloWorld')call abortif(a.ge.b)call abortend program