View Compilation Error

0_0_31485986_7745.cpp: In function 'int main()':
0_0_31485986_7745.cpp:54:16: error: 'a' was not declared in this scope
             if(a>b)swap(a,b);
                ^
0_0_31485986_7745.cpp:54:18: error: 'b' was not declared in this scope
             if(a>b)swap(a,b);
                  ^