View Compilation Error

157061_0_24118.cpp: In function `int main()':
157061_0_24118.cpp:4: error: `doble' undeclared (first use this function)
157061_0_24118.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
157061_0_24118.cpp:4: error: expected `;' before "a"
157061_0_24118.cpp:12: error: `a' undeclared (first use this function)
157061_0_24118.cpp:12: error: `b' undeclared (first use this function)