View Compilation Error

0_0_38751298_23022.cpp: In function 'int main()':
0_0_38751298_23022.cpp:21:5: error: 'memset' was not declared in this scope
   21 |     memset(cal_a, '\0', sizeof(cal_a));
      |     ^~~~~~
0_0_38751298_23022.cpp:3:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include <iostream>
  +++ |+#include <cstring>
    3 | 
0_0_38751298_23022.cpp:28:17: error: 'strlen' was not declared in this scope
   28 |     int len_a = strlen(cal_a);
      |                 ^~~~~~
0_0_38751298_23022.cpp:28:17: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?