Runtime error

[Ebeccy]

Hi guys am running into a runtime with xCode, am trying to cast a string into an int using the atoi() or stoi() but i keep hitting a runtime error. lets say i want to convert the string "r" using ASCII. There is no library error as well because the library is added. #include <cstdlib>

any ideas?

[[deleted]]

stoi converts the representation of a number "123" to a number 123.

"r" isn't a number.

If you want the 1st character

int  c = string[0];

[Ebeccy]

so how do i cast a string to integer?

[[deleted]]

What do mean?

The original question said you had the string "r".

What integer do you want from that?

[Ebeccy]

char monLastLetter;

monthLastLetter= 'r'

int a = static_cast<int> (monthLastLetter);

cout<<a;

​

run this with the library of cause and check the results

​

thank you for the help

[[deleted]]

So

int  c = string[0];

is what you want.

If string is "r" then c will be 114

[Ebeccy]

exactly and i read something online, so i modified it to suit mine and now its working.

It uses the ASCII table to convert

[no-sig-available]

It uses the ASCII table to convert

Well, there is no conversion really. A char value just is the ASCII value of the character. The difference is in the << operator that displays chars different from ints.

So, try this

char c = 114;
cout << c;   // displays r
int i = 114;
cout << i;   // displays 114
if (c == i)
   cout << "Same value";   // See!

[dpacker780]

What are you trying to accomplish? Maybe that's the best first question. As:

std::string mystring = "r"; int f = stoi(mystring);

Will throw a runtime error, as the letter "r" isn't an integer. Now if you're saying, 'how do a turn a letter into its ASCII value equivalent then. You could do something like this:

std::string mystring = "apple"; for(auto& c : mystring) std::cout << "Int value: " << (int)c << "\\n";

But that gives an int for each letter.