View Compilation Error

0_0_37525512_14560.cpp: In function 'int main()':
0_0_37525512_14560.cpp:19:24: error: 'ni' was not declared in this scope
         for(int i=0;i<=ni++)
                        ^
0_0_37525512_14560.cpp:19:28: error: expected ';' before ')' token
         for(int i=0;i<=ni++)
                            ^