Why I am not able to access string individual chars using index

Question

string strMap[8] = {"abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"}; //string digits received as parameter in function // digits = "234";

Accessing it as below:

int digitmapIndex = digits[index] - 46; //index is some int 0,1 etc.. int mapstr_len = strMap[digitmapIndex];

or

int mapstr_len = strMap[digits[index] - 46];

Error:

Line 25: Char 13: error: no viable conversion from 'std::string' (aka 'basic_string<char>') to 'int' int mapstr_len = strMap[digits[index] - 46]; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/basic_string.h:816:7: note: candidate function operator __sv_type() const noexcept

strMap[digitmapIndex] is a std::string the compiler does not have a way to automatically convert it to an integer. — drescherjm
– drescherjm, Commented Feb 11, 2021 at 20:06
By your variable naming did you want: int mapstr_len = strMap[digitmapIndex].length(); — drescherjm
– drescherjm, Commented Feb 11, 2021 at 20:09

Remy Lebeau · Accepted Answer · 2021-02-11 22:01:26Z

This line makes no sense:

int mapstr_len = strMap[digitmapIndex];

strMap[digitmapIndex] is a string object, and cannot be assigned to an int.

auto temp = strMap[digitmapIndex];

From temp, you can access its chars by index.

Collectives™ on Stack Overflow

Why I am not able to access string individual chars using index

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related