View Compilation Error

0_0_12675850_1176.cpp: In function `int main()':
0_0_12675850_1176.cpp:19: error: `k' undeclared (first use this function)
0_0_12675850_1176.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12675850_1176.cpp:36: error: expected `}' at end of input