View Compilation Error

0_0_2260578_6118.cpp: In function `void Gauss()':
0_0_2260578_6118.cpp:27: error: `dcmp' undeclared (first use this function)
0_0_2260578_6118.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2260578_6118.cpp:33: error: `tmp' undeclared (first use this function)