Can anybody see what is wrong with this? It gets stuck in a loop. I think I am too tired!! Thanks!
Code:#include <iostream.h> #include <string.h> //used for strlen bool InLanguage(char s[], int first, int last) { // Even length -> false if((last-first)%2 == 1) return false; char sf=s[first], sl=s[last]; // Both MUST be equal, otherwise false. if(sf != sl) return false; // Since sf==sl, check sf only if(sf != 'a' && sf != 'b') return false; // check single char sequence first if (first == last) return true; else return InLanguage(s, first + 1, last - 1); } void main() { char string[20]; unsigned int First, Last; cout << "Enter a string less than 20 characters long: ";//prompt cin >> string; do { cout << endl; cout << "Enter first index: ";//prompt user for input cin >> First; //input cout << "Enter last index: ";//prompt user for input cin >> Last; //input } while((First < 0 || First > strlen(string)-1) || (Last <= First || Last > strlen(string)-1)); for(unsigned int a = First; a <= Last; a++) {cout << string[a];} if(InLanguage(string, First, Last)) {cout << " is in the language." << endl;} else {cout << " is not in the language." << endl;} }
) than <string.h>/<cstring>.
Tip of the Day
