View Compilation Error

616761_0_0_16604.cpp: In function `int main()':
616761_0_0_16604.cpp:8: error: `scnanf' undeclared (first use this function)
616761_0_0_16604.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
616761_0_0_16604.cpp:9: error: `a' undeclared (first use this function)