View Compilation Error

0_0_2227740_26673.cpp: In function `int main()':
0_0_2227740_26673.cpp:20: error: `i' undeclared (first use this function)
0_0_2227740_26673.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2227740_26673.cpp:28: error: `j' undeclared (first use this function)