View Compilation Error

0_0_16500847_4877.cpp:3:11: error: '::main' must return 'int'
 void main()
           ^
0_0_16500847_4877.cpp: In function 'int main()':
0_0_16500847_4877.cpp:11:6: error: 'i' was not declared in this scope
  for(i=1;i<b+1;i++)
      ^
0_0_16500847_4877.cpp:19:8: error: 'i' was not declared in this scope
  for(  i=1;i<a+1;i++)
        ^