Why does error come in line 5?

#1

"/* The output of the following program is ? */ 1) #include
2) using namespace std;
3) int main(){
4) signed CodingBlocks = 9;
5) signed Nagarro = A;
6) signed char HackerBlocks = ‘A’;
7) cout<<CodingBlocks<<endl;
8) cout<<HackerBlocks<<endl;
9) return 0;
} "

#2

because A is not defined ,we don’t know what is A
but if we write
signed Nagarro =‘A’;
this will not give error

#3

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