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PONeed Help Using "Sort" Within My Program
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copied!<p>I have a simple program that lists input in order of precedence, checking only for operators and ranking them like so, "*/+-":</p> <pre><code>#include <iostream> #include <stack> #include <string> using namespace std; int prec(char op) { if (op == '*' || op == '/') return 0; return 1; } bool compareprec(char a, char b) { return prec(a) < prec(b); } int main() { char input[] = "+-/*"; cin >> input; sort(input, input + 4, &compareprec); cout << input; } </code></pre> <p>I'm trying to implement it within a more complex program that uses stacks to check alpha numerical input and do an infix to postfix conversion, ranking something that looks like this: "9*9+9" into "9 9 9 * +". The more complex program is as follows:</p> <pre><code>#include <iostream> #include <stack> #include <string> using namespace std; int prec(char op) { if (op == '*' || op == '/' || op == '+' || op == '-') return 0; return 1; } bool compareprec(char a, char b) { return prec(a) < prec(b); } int main() { stack<char> s; char input; while (cin.get(input) && input != '\n') { if (isalnum(input)) cout << input << " "; else if (input == '(') s.push(input); else if (input == ')') { while (!s.empty() && s.top() != '(') { cout << s.top() << " "; s.pop(); } if(!s.empty()) s.pop(); else cout << "ERROR: No Matching ( \n"; } else if (s.empty() && input == '*'|| input == '/'|| input == '+'|| input == '-') { sort(input, input + 4, &compareprec); // Error Begins Here? s.push(input); } else if (input == '*'||input == '/'||input == '+'|| input =='-') while (!s.empty()) { sort(input, input + 4, &compareprec); // More Errors Here? cout << s.top() << "\n "; s.pop(); s.push(input); } } while (!s.empty()) { cout << s.top() << " "; s.pop(); } } </code></pre> <p>But I keep getting an error that says:</p> <pre><code>error: no matching function for call to 'sort(char&, int, bool (*)(char, char))' error: no matching function for call to 'sort(char&, int, bool (*)(char, char))' </code></pre> <p>And I'm not sure why. I know it's probably something painfully obvious/silly but I can't figure it out. Any help would be appreciated. Thanks in advance!</p>

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