View Compilation Error

0_0_4714229_32174.cpp:4: error: expected constructor, destructor, or type conversion before '(' token
0_0_4714229_32174.cpp:4: error: expected `,' or `;' before '(' token
0_0_4714229_32174.cpp:8: error: expected constructor, destructor, or type conversion before '(' token
0_0_4714229_32174.cpp:8: error: expected `,' or `;' before '(' token
0_0_4714229_32174.cpp: In function `int main()':
0_0_4714229_32174.cpp:13: error: `scanf' undeclared (first use this function)
0_0_4714229_32174.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4714229_32174.cpp:16: error: `c' undeclared (first use this function)
0_0_4714229_32174.cpp:20: error: `d' undeclared (first use this function)
0_0_4714229_32174.cpp:22: error: `strrev' undeclared (first use this function)
0_0_4714229_32174.cpp:25: error: `puts' undeclared (first use this function)