View Compilation Error

0_0_7470821_21595.cpp:1: error: expected constructor, destructor, or type conversion before '<' token
0_0_7470821_21595.cpp:1: error: expected `,' or `;' before '<' token
0_0_7470821_21595.cpp: In function `double f(double, double)':
0_0_7470821_21595.cpp:11: error: `c' undeclared (first use this function)
0_0_7470821_21595.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7470821_21595.cpp: In function `int main()':
0_0_7470821_21595.cpp:16: error: `scanf' undeclared (first use this function)
0_0_7470821_21595.cpp:21: error: `printf' undeclared (first use this function)