View Compilation Error

0_0_18932917_9322.cpp: In function 'int main()':
0_0_18932917_9322.cpp:5:22: error: 'sum' was not declared in this scope
          scanf("%d",&sum);
                      ^
0_0_18932917_9322.cpp:7:3: error: 'a' was not declared in this scope
   a=sum/100;
   ^
0_0_18932917_9322.cpp:8:3: error: 'b' was not declared in this scope
   b=(sum-a*100)/10;
   ^
0_0_18932917_9322.cpp:9:3: error: 'c' was not declared in this scope
   c=sum%10;
   ^