View Compilation Error

0_0_5268339_20836.c: In function `main':
0_0_5268339_20836.c:13: error: `t' undeclared (first use in this function)
0_0_5268339_20836.c:13: error: (Each undeclared identifier is reported only once
0_0_5268339_20836.c:13: error: for each function it appears in.)
0_0_5268339_20836.c:30: error: syntax error at end of input