View Compilation Error

0_0_21853398_12471.cpp: In function 'void js(point, point)':
0_0_21853398_12471.cpp:20:7: error: 'sum' was not declared in this scope
       sum++;
       ^
0_0_21853398_12471.cpp:22:7: error: 'sum' was not declared in this scope
       sum++;
       ^