Index in position 1 exceeds array bounds (must not exceed 1)

This is my script :

kwh=input('How much KWH this month :');
ckwh=6.6*kwh/100;
fprintf('Your charge for %5d will be %.2d',kwh,ckwh)

Matlab return this : Index in position 1 exceeds array bounds (must not exceed 1).

Help me please !!!

Answer 1

[madhan ravi]

clear all % you're probably shadowing the inbuilt function input()\fprintf()
%or
clear input fprintf

Answer 2

[Rémi St-Laurent]

Thank it works ahahahah