View Compilation Error

0_0_15951770_2553.cpp: In function 'void getFail(char*, int*)':
0_0_15951770_2553.cpp:11:22: error: 'strlen' was not declared in this scope
      int m = strlen(P); 
                      ^
0_0_15951770_2553.cpp: In function 'void find(char*, char*, int*)':
0_0_15951770_2553.cpp:22:22: error: 'strlen' was not declared in this scope
      int n = strlen(T), m = strlen(P); 
                      ^
0_0_15951770_2553.cpp:29:18: error: 'm' was not declared in this scope
         if (j == m) { Ans++; j = 0; }  
                  ^