Code:
Mod1[a_, b_] := If[a < b,
Return[a];
,
Return[Mod1[a - b, b]];
];
Code:
Mod2[a_, b_] := Module[{},
If[a < b,
Return[a];
,
Return[Mod2[a - b, b]];
];
];
Code:
Mod3[a_, b_] := Block[{},
If[a < b,
Return[a];
,
Return[Mod3[a - b, b]];
];
];