View Compilation Error

0_0_3969093_12169.cpp:5: error: `_int64' does not name a type
0_0_3969093_12169.cpp:6: error: `_int64' does not name a type
0_0_3969093_12169.cpp: In function `void work()':
0_0_3969093_12169.cpp:25: error: `num' undeclared (first use this function)
0_0_3969093_12169.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3969093_12169.cpp:26: error: `mod' undeclared (first use this function)
0_0_3969093_12169.cpp:33: error: `t' undeclared (first use this function)
0_0_3969093_12169.cpp:37: error: `ch' undeclared (first use this function)