View Compilation Error

0_0_4962189_6250.cpp: In function `int main()':
0_0_4962189_6250.cpp:6: error: `scanf' undeclared (first use this function)
0_0_4962189_6250.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4962189_6250.cpp:9: error: `strchr' undeclared (first use this function)
0_0_4962189_6250.cpp:16: error: `printf' undeclared (first use this function)
0_0_4962189_6250.cpp:19: error: expected `}' at end of input