View Compilation Error

300196_0_27644.cpp: In function `int main()':
300196_0_27644.cpp:22: error: `j' undeclared (first use this function)
300196_0_27644.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
300196_0_27644.cpp:39: error: invalid operands of types `<unknown type>' and `int' to binary `operator*'