View Compilation Error

0_0_3783098_28664.cpp: In function `int main()':
0_0_3783098_28664.cpp:26: error: `b' undeclared (first use this function)
0_0_3783098_28664.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3783098_28664.cpp:30: error: `x' undeclared (first use this function)
0_0_3783098_28664.cpp:31: error: `e' undeclared (first use this function)