使用at函数替换字符串中的字符？

Question

I have a string CorrAns = "Text", I want to replace a character at a particular position with a character from another string. I used the following:

CorrAns.replace(1,1,OtherString.at(pos));

But its giving error, what is the best way to do this??

Answer 1

Just use at (or the [] operator) accross the board:

corrAns[1] = otherString[pos];

(Note that at rarely has the semantics you want. If a bounds error is a precondition failure, as is usually the case, the last thing you want is an exception.)

Answer 2

Your syntax is wrong. There are several methods for replace() function. Check below :

http://www.ansatt.hig.no/frodeh/ooprog/string2.html

Answer 3

replace has no overload taking size, size, char . You want

CorrAns.replace(1, 1, 1, OtherString.at(pos));

or

CorrAns.replace(1, 1, OtherString.substr(pos, 1));

Answer 4

The straightforward way to do this would be:

CorrAns[1] = OtherString[pos];

If you insist on using the replace function, check out this reference . One correct call would look like:

CorrAns.replace(1, 1, 1, OtherString.at(pos));