View Compilation Error

0_0_28915475_21511.cpp:13:10: error: expected initializer before 'num'
 int a, b num;
          ^
0_0_28915475_21511.cpp: In function 'int main()':
0_0_28915475_21511.cpp:55:27: error: 'num' was not declared in this scope
    scanf("%d: (%d)", &a, &num); 
                           ^
0_0_28915475_21511.cpp:58:18: error: 'b' was not declared in this scope
     scanf("%d", &b);  
                  ^