create a calculator using arithmetic operators

a=input(prompt,'s');
c=2;
d=3;
h=6;
if a=='+'
e=c+d;
e
else
e=c-d;
e
end
what is wrong with this addition code?

 采纳的回答

prompt = 'Enter sign:' ;
a=input(prompt,'s');
c=2;
d=3;
h=6;
if strcmp(a,'+')
e=c+d;
e
else
e=c-d;
e
end

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