View Compilation Error

0_0_39561784_15350.cpp: In function 'int main()':
0_0_39561784_15350.cpp:15:22: error: conflicting declaration 'char c'
   15 |                 char c=getchar();
      |                      ^
0_0_39561784_15350.cpp:8:24: note: previous declaration as 'double c'
    8 |                 double c=(int)((double)(b-a)*((sqrt(5)+1)/2));
      |                        ^