View Compilation Error

0_0_35305644_5758.cpp: In function 'int main()':
0_0_35305644_5758.cpp:54:25: error: 'c' was not declared in this scope
                         c.push(a.top()),a.pop();
                         ^
0_0_35305644_5758.cpp:56:25: error: 'c' was not declared in this scope
                         c.push(b.top()),b.pop();
                         ^
0_0_35305644_5758.cpp:58:21: error: 'c' was not declared in this scope
                     c.push(a.top()),a.pop();
                     ^
0_0_35305644_5758.cpp:60:21: error: 'c' was not declared in this scope
                     c.push(b.top()),b.pop();
                     ^
0_0_35305644_5758.cpp:63:27: error: 'c' was not declared in this scope
                     while(c.empty()==false)
                           ^
0_0_35305644_5758.cpp:69:27: error: 'c' was not declared in this scope
                     while(c.empty()==false)
                           ^