View Compilation Error

0_0_32692921_13796.cpp: In function 'int main()':
0_0_32692921_13796.cpp:13:21: error: 'strcmp' was not declared in this scope
   if(strcmp(a,"<hr>")==0)
                     ^
0_0_32692921_13796.cpp:36:20: error: 'strlen' was not declared in this scope
    if((num+strlen(a)+1)>80)
                    ^