View Compilation Error

0_0_18428167_20022.cpp:2:11: error: '::main' must return 'int'
 void main()
           ^
0_0_18428167_20022.cpp: In function 'int main()':
0_0_18428167_20022.cpp:5:20: error: 'i' was not declared in this scope
     for(n=1;n<=100;i=n++)
                    ^