View Compilation Error

0_0_18402877_16090.c: In function 'main':
0_0_18402877_16090.c:5:17: error: redeclaration of 'sum' with no linkage
  double max,min,sum,temp;
                 ^
0_0_18402877_16090.c:4:9: note: previous declaration of 'sum' was here
  double sum,aa;
         ^