View Compilation Error

0_0_23578713_31527.cpp: In function 'int main()':
0_0_23578713_31527.cpp:10:27: error: 'a' was not declared in this scope
         scanf("%d %d %d",&a,&b,&c);
                           ^
0_0_23578713_31527.cpp:10:30: error: 'b' was not declared in this scope
         scanf("%d %d %d",&a,&b,&c);
                              ^
0_0_23578713_31527.cpp:10:33: error: 'c' was not declared in this scope
         scanf("%d %d %d",&a,&b,&c);
                                 ^