View Compilation Error

0_0_7744235_9206.cpp: In function `int fj(int, int, int)':
0_0_7744235_9206.cpp:15: error: `c' undeclared (first use this function)
0_0_7744235_9206.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7744235_9206.cpp:17: error: `a' undeclared (first use this function)
0_0_7744235_9206.cpp:17: error: `b' undeclared (first use this function)