View Compilation Error

0_0_5988776_24389.cpp: In function `void compute()':
0_0_5988776_24389.cpp:17: error: `c' undeclared (first use this function)
0_0_5988776_24389.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5988776_24389.cpp:17: error: expected `)' at end of input
0_0_5988776_24389.cpp:17: error: expected primary-expression at end of input
0_0_5988776_24389.cpp:17: error: expected `;' at end of input
0_0_5988776_24389.cpp:17: error: expected `}' at end of input
0_0_5988776_24389.cpp:17: error: expected `}' at end of input