foo.cc:1:1: error: 'include' does not name a type
    1 | include <stdio.h>
      | ^~~~~~~
foo.cc: In function 'int main()':
foo.cc:7:2: error: 'scanf' was not declared in this scope
    7 |  scanf("%d%d%lf%lf%lf",&n,&m,&d,&first,&last);
      |  ^~~~~
foo.cc:10:3: error: 'printf' was not declared in this scope
   10 |   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:12:2: error: 'a' was not declared in this scope
   12 |  a[n][0] = 1;
      |  ^
foo.cc:21:2: 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:21:2: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?

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