View Compilation Error

0_0_3109417_12199.cpp: In function `int main()':
0_0_3109417_12199.cpp:8: error: `t' undeclared (first use this function)
0_0_3109417_12199.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3109417_12199.cpp:13: error: `s' undeclared (first use this function)