View Compilation Error

0_0_4889547_15487.cpp: In function `int main()':
0_0_4889547_15487.cpp:9: error: `strcmp' undeclared (first use this function)
0_0_4889547_15487.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4889547_15487.cpp:12: error: redeclaration of `int sum'
0_0_4889547_15487.cpp:7: error: `int sum' previously declared here
0_0_4889547_15487.cpp:13: error: redeclaration of `char*p'
0_0_4889547_15487.cpp:8: error: `char*p' previously declared here