View Compilation Error

156398_0_21724.cpp: In function `int main()':
156398_0_21724.cpp:7: error: expected unqualified-id before "double"
156398_0_21724.cpp:7: error: expected `,' or `;' before "double"
156398_0_21724.cpp:37: error: `c' undeclared (first use this function)
156398_0_21724.cpp:37: error: (Each undeclared identifier is reported only once for each function it appears in.)