View Compilation Error

0_0_6576056_22531.cpp: In function `int main()':
0_0_6576056_22531.cpp:18: error: `i' undeclared (first use this function)
0_0_6576056_22531.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6576056_22531.cpp:20: error: `t' undeclared (first use this function)