View Compilation Error

0_0_36703677_9129.cpp: In function 'int main()':
0_0_36703677_9129.cpp:47:16: error: 'a' was not declared in this scope
  while (cin >> a >> p >> b, a || b || p) {
                ^
0_0_36703677_9129.cpp:47:21: error: 'p' was not declared in this scope
  while (cin >> a >> p >> b, a || b || p) {
                     ^
0_0_36703677_9129.cpp:47:26: error: 'b' was not declared in this scope
  while (cin >> a >> p >> b, a || b || p) {
                          ^