C++ Primer Plus 7.4

//test 7.4 lotto--probability of winning #include <iostream> long double probability(unsigned numbers, unsigned picks); int main() { using namespace std; /* //one field double total,choices; cout<< "Enter the total number of choices on the game card and/n" "the number of picks allowed:/n"; while((cin>> total>> choices)&& choices<=total) { cout << "You have one chance in "; cout << probability(total,choices); //compute the odds cout << " of winning./n"; cout << "Next two numbers (q to quit): "; } */ //two field // double total_a,choices_a,total_b,choices_b; cout<< "Enter the total number of choices on the game card and/n" "the number of picks allowed in first field:/n"; while((cin>> total_a>> choices_a)&& choices_a<=total_a) { cout<< "The other two numbers in second field: "; if((cin>> total_b>> choices_b)&& choices_b<=total_b) { cout << "You have one chance in "; cout << probability(total_a,choices_a)*probability(total_b,choices_b); //compute the odds cout << " of winning./n"; } else break; cout << "Next two numbers (q to quit): "; } // cout << "bye/n"; return 0; } long double probability(unsigned numbers, unsigned picks) { long double result = 1.0; long double n; unsigned p; for(n=numbers, p=picks;p>0; n--,p--) result = result * n / p; return result; }

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