View Compilation Error

0_0_4427213_23481.cpp: In function `int main()':
0_0_4427213_23481.cpp:10: error: `k' undeclared (first use this function)
0_0_4427213_23481.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4427213_23481.cpp:14: error: `j' undeclared (first use this function)
0_0_4427213_23481.cpp:16: error: `i' undeclared (first use this function)