Comparing String (.substr()) to Character (.back()) in C-CodePudding

I am trying to compare whether the last letter of the word "A", and the next letter of the word "B" is the same.

I'm iterating over "B"; and comparing within an if statement:

string A = ""
string B = "XYZTTTTLMN"

for (long i = 0; i < B.length(); i  ) {

    if ( A.back() != B.substr(i,1) ) { ... }

}

I receive an error that says I can't compare a string to a character. But, as far as I can see, A.back() returns a character and B.substr() returns a single digit string, which should be OK?

Any ideas on what I can do?

Much appreciated, thank you!

CodePudding user response：

In C , a string having size=1 is not same as a character. This is the reason you are getting error as string and character cannot be compared as you did.

To solve this you can use below code:

  for (long i = 0; i < B.length(); i  ) {

    if ( A.back() != B.at(i) ) { ... }

  }

  for (long i = 0; i < B.length(); i  ) {

    if ( A.back() != B[i] ) { ... }

  }