0_0_34673229_4519.cpp: In function 'int main()': 0_0_34673229_4519.cpp:19:19: error: conflicting declaration 'double r' double l = 0, r = sum / (f + 1), mid; ^ 0_0_34673229_4519.cpp:10:15: note: previous declaration as 'int r' int n, f, r; ^