foo.cc:1:1: error: 'include' does not name a type
    1 | include <stdio.h>
      | ^~~~~~~
foo.cc: In function 'int main()':
foo.cc:9:1: error: 'scanf' was not declared in this scope
    9 | scanf("%d%d%lf%lf%lf",&n,&m,&d,&first,&last);
      | ^~~~~
foo.cc:11:1: error: 'printf' was not declared in this scope
   11 | printf("%.3lf\n", m==1 ? first : last);
      | ^~~~~~
foo.cc:1:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
  +++ |+#include <cstdio>
    1 | include <stdio.h>
foo.cc:13:1: error: 'a' was not declared in this scope
   13 | a[n][0] = 1;
      | ^
foo.cc:21:1: error: 'printf' was not declared in this scope
   21 | printf("%.3lf\n",a[m][0]*last + a[m][1]*t + a[m][2]*d);
      | ^~~~~~
foo.cc:21:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?

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