WTF my while loop is on permenent vacation

This is a discussion on WTF my while loop is on permenent vacation within the C++ Programming forums, part of the General Programming Boards category; In further pursing my silly solution to lilostitch382's "assign string to int array" I have been hamstrung: Code: #include <iostream> ...

  1. #1
    spurious conceit MK27's Avatar
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    WTF my while loop is on permenent vacation

    In further pursing my silly solution to lilostitch382's "assign string to int array" I have been hamstrung:
    Code:
    #include <iostream>
    #include <string>
    using namespace std;
    
    class nlist : public string {
    	public:
    		nlist(string in) {
    			assign(in);
    		}
    		int extract(size_t pos) {
    			int retv = 0, m = 1;
    			size_t end;
    			while (at(pos) < '0'|| at(pos) > '9') {
    				printf("%d %d\n",pos,at(pos)); fflush(stdout);
    				pos++;
    			}
    			cout << "hey";
    			end = pos;
    			while (at(end) > '0'&& at(end) < '9') end++;
    			end--;
    			while (end>=pos) {
    				retv += (at(pos)-48)*m;
    				m*=10;
    			}
    			return retv;
    		}
    };
    
    int main() {
    	string src="1,44,56,33";
    	nlist nums(src);
    
    	cout << nums << "\n" << nums.extract(1);
    
    	return 0;
    }
    Execution pauses indefinitely at pos++.

    WHY????
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  2. #2
    Registered User
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    Are you sure you're not stuck in:
    Code:
    while (end>=pos) {
    That looks like the loop that will go forever...
    Your "hey" debug may not show up since there is nothing there to flush the output buffer.
    bit∙hub [bit-huhb] n. A source and destination for information.

  3. #3
    spurious conceit MK27's Avatar
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    Quote Originally Posted by bithub View Post
    Are you sure you're not stuck in:
    Code:
    while (end>=pos) {
    That looks like the loop that will go forever...
    Your "hey" debug may not show up since there is nothing there to flush the output buffer.
    Heh heh -- new things make me confused and paranoid.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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