View Compilation Error

0_0_32891500_32752.cpp: In function 'bool search(char*)':
0_0_32891500_32752.cpp:6:18: error: 'strlen' was not declared in this scope
  int len=strlen(a),i;
                  ^
0_0_32891500_32752.cpp:7:6: error: 'i' was not declared in this scope
  for(i=0;i<len;i++)
      ^
0_0_32891500_32752.cpp:10:5: error: 'i' was not declared in this scope
  if(i>=len)
     ^
0_0_32891500_32752.cpp: In function 'int main()':
0_0_32891500_32752.cpp:24:31: error: 'memset' was not declared in this scope
   memset(tempa,0,sizeof(tempa));  //重置
                               ^