View Compilation Error

0_0_7485697_13048.cpp:8: error: `time' does not name a type
0_0_7485697_13048.cpp:21: error: expected `)' before "a"
0_0_7485697_13048.cpp:22: error: cannot convert `time_t (*)(time_t*)' to `double' in initialization
0_0_7485697_13048.cpp:22: error: expected `,' or `;' before '{' token
0_0_7485697_13048.cpp: In function `int main()':
0_0_7485697_13048.cpp:34: error: expected `;' before "A"
0_0_7485697_13048.cpp:42: error: `A' undeclared (first use this function)
0_0_7485697_13048.cpp:42: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7485697_13048.cpp:42: error: `cal' undeclared (first use this function)
0_0_7485697_13048.cpp:43: error: `angle' cannot be used as a function