View Compilation Error

0_0_4260492_11055.c: In function `main':
0_0_4260492_11055.c:42: error: `k' undeclared (first use in this function)
0_0_4260492_11055.c:42: error: (Each undeclared identifier is reported only once
0_0_4260492_11055.c:42: error: for each function it appears in.)
0_0_4260492_11055.c:55: error: syntax error at end of input