View Compilation Error

0_0_8612222_6707.cpp:3: error: `main' must return `int'
0_0_8612222_6707.cpp: In function `int main(...)':
0_0_8612222_6707.cpp:10: error: `k0' undeclared (first use this function)
0_0_8612222_6707.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8612222_6707.cpp:12: error: `x0' undeclared (first use this function)
0_0_8612222_6707.cpp:15: error: `t0' undeclared (first use this function)