Cannot find bounds of current function (Code::Blocks) C++ - c++

Question

I am using the latest version of Code::Blocks. I have a function that passes in a string and a vector. The function compiles with no errors. However, when I run the debugger, it immediately leads me to line 118 (which I have noted) and gives me trouble. The error that comes up says "Cannot find bounds of current function".
Here is the function, which takes in a line of code of a variable declaration (like "var c=0"), and gets the variable of it and adds its value to the vector, v, a struct with an int value and string name:
char get_variable_declaration(string line, vector<variable> &v)
{
string b;
variable t;
char d[0];
int counter = 0;
int a;
for (int i = 0; i<line.size(); i++) {
if (line[i] == 'r' && counter != 1) {
b[0] = line [i+2];
counter ++;
}
if (line[i] == '=') {
b[1]=line[i+1];
}
}
t.name = b[0];
d[0] = b[1];
a = atoi (d);
t.value = a;
v.push_back (t);
return b[0];
//This function will take in a line of code
//that is confirmed to have a variable declaration
//it will add the variable to the list of
//vectors
}
Here is when it is called:
bool read_code(string file_name, vector<funct> &my_functions, vector<variable> & v)
{
vector<string> code;
string s;
std::size_t found;
bool flag;
funct new_function;
ifstream in;
in.open(file_name.c_str());
if(in.is_open())
{
//read in file line by line and put it into a vector called code
while(in.peek()!=EOF)
{
getline(in,s);
code.push_back(s);
}
in.clear();
in.close();
//read through each line of the code, determine if it's a variable or function (definition or call)
//here it makes reference to functions (listed following this one) which will actually decompose the line
//for information
for(int i=0;i<code.size();i++)
{
//check if it's a variable declaration
found = code[i].find("var");
if(found!=std::string::npos) //its a variable declaration
get_variable_declaration(code[i], v); //ERROR CANNOT FIND..
//check if it's a function. it'll go in the list of functions
found = code[i].find("funct");
if (found!=std::string::npos) //that means it's a function
{
new_function.funct_name=get_function_name(code[i]);
new_function.commands.clear();
i+=2; //skip over the open curly brace
flag=false;
while(!flag)
{
found = code[i].find("}");
if(found==std::string::npos)
{
new_function.commands.push_back(code[i]);
i++;
}
else
{
my_functions.push_back(new_function);
flag=true;
}
}
}
}
return true;
}
else
{
cout << "Cannot locate this file" << endl;
return false;
}
}
Disclaimer: Yes, this is a homework assignment. No, I am not looking for anyone to finish this assignment for me. But, I am still mostly a novice at coding, in need of some assistance, so I ask if you know what is going on, please help me address this issue. Thanks!
Edit: I have gotten this to work on another compiler w/o the text file I am reading from. Not sure if this is a universal issue, or one that the other compiler just didn't pick up on.

Answer 1

Multiple problems with this section of code:
string b;
for (int i = 0; i<line.size(); i++) {
if (line[i] == 'r' && counter != 1) {
b[0] = line [i+2];
counter ++;
}
if (line[i] == '=') {
b[1]=line[i+1];
}
}
Problems:
If the last character in line is 'r', undefined behavior can occur.
If the next to last character in line is 'r', undefined behavior can occur.
If the last character in line is '=', undefined behavior occurs.
Both assignments to b[0] and b[1] is undefined behavior. The b string is empty.
There are also other instances of undefined behavior that have been noted in the comments, which I won't duplicate.

Answer 2

I found the problem. To correctly use atoi, you cannot use a specific character from a string or character array. If you declare a char a[3], and you want to use atoi, you must use it like int value = atoi(a) and not value = atoi(a[2]). If you do not do it this way, it will cause a runtime error.