View Compilation Error

0_0_34538385_12603.cpp: In function 'int main()':
0_0_34538385_12603.cpp:9:7: error: 'i' was not declared in this scope
   for(i=0;i<=b;i++)
       ^
0_0_34538385_12603.cpp:10:3: error: 'num' was not declared in this scope
   num+=d[i];
   ^
0_0_34538385_12603.cpp:14:4: error: 'num' was not declared in this scope
    num+=c+1;
    ^
0_0_34538385_12603.cpp:16:4: error: 'num' was not declared in this scope
    num+=c;
    ^
0_0_34538385_12603.cpp:19:3: error: 'num' was not declared in this scope
   num+=c;
   ^