▁in ▁saying ▁the ▁magic ▁phrase ▁" F ee ▁F ie ▁F oe ▁Foo ". ▁Intel ▁also ▁used ▁the ▁term ▁foo ▁in ▁their ▁programming ▁documentation ▁in ▁ 1 9 7 8 . ▁ ▁Example ▁use ▁in ▁code ▁In ▁this ▁Hello ▁World ▁code ▁sample ▁in ▁C , ▁foo ▁and ▁bar ▁are ▁used ▁to ▁illustrate ▁string ▁concaten ation : ▁ ▁# include ▁< stdio . h > ▁ ▁int ▁main () ▁{ ▁▁▁ ▁const ▁char ▁* foo ▁= ▁" Hello "; ▁▁▁ ▁const ▁char ▁* bar ▁= ▁" World ! "; ▁▁▁ ▁f printf ( stdout , ▁"% s ▁% s \ n ", ▁foo , ▁bar ); ▁▁▁▁ ▁return ▁ 0 ; ▁} In ▁this ▁Sch eme ▁code ▁sample , ▁fo obar ▁is ▁used ▁to ▁illustrate ▁the ▁name ▁of ▁a ▁function :( define ▁fo obar ▁▁▁ ▁( lambda ▁( x ) ▁▁▁▁▁▁ ▁( display ▁x ))) ▁( fo obar ▁" Hello ▁World ! ") ▁ ▁Ex amples ▁in ▁language ▁ ▁Foo ▁Camp ▁is ▁an ▁annual ▁ha cker ▁convention . ▁ ▁Bar C amp , ▁an ▁international ▁network ▁of ▁user ▁generated ▁con ferences ▁ ▁During ▁the ▁United ▁States ▁v . ▁Microsoft ▁Cor p . ▁trial , ▁some ▁evidence ▁was ▁presented ▁that ▁Microsoft ▁had ▁tried ▁to ▁use ▁the ▁Web ▁Services ▁Inter oper ability ▁organization ▁as ▁a ▁means ▁to ▁st if le ▁competition , ▁including ▁e - mail s ▁in ▁which ▁top ▁execut ives ▁including ▁Bill ▁G ates ▁referred ▁to ▁the ▁W S - I ▁using ▁the ▁cod ename ▁" foo ". ▁ ▁fo obar 2 0 0