View Compilation Error

0_0_2658705_139.cpp:3: error: ISO C++ forbids declaration of `lg' with no type
0_0_2658705_139.cpp:10: error: ISO C++ forbids declaration of `rg' with no type
0_0_2658705_139.cpp:17: error: ISO C++ forbids declaration of `sg' with no type
0_0_2658705_139.cpp:24: error: ISO C++ forbids declaration of `hg' with no type
0_0_2658705_139.cpp:31: error: ISO C++ forbids declaration of `kg' with no type
0_0_2658705_139.cpp: In function `int main()':
0_0_2658705_139.cpp:45: error: `strlen' undeclared (first use this function)
0_0_2658705_139.cpp:45: error: (Each undeclared identifier is reported only once for each function it appears in.)