View Compilation Error

0_0_4742911_13320.cpp: In function `long long int guass()':
0_0_4742911_13320.cpp:16: error: `s' undeclared (first use this function)
0_0_4742911_13320.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4742911_13320.cpp:16: error: `tem' undeclared (first use this function)