View Compilation Error

0_0_17930469_15333.cpp: In function 'int main()':
0_0_17930469_15333.cpp:9:15: error: 'i' was not declared in this scope
  for(int SB=1;i<=cas;++SB){
               ^
0_0_17930469_15333.cpp:32:23: error: 'ch' was not declared in this scope
     scanf("%d %c",&l,&ch);
                       ^