I created lots of files in the same folder, but it appears error in the makefile and none of my codes are running anymore

code snippet

Looks like from the error you wrote include <stdio.h>instead of #include <stdio.h>.

Looking at your exercise 5 it’s the exact thing that @STCollier already mentioned.
This is your exercise 5, and you forgot to include the ‘#’

include <stdio.h>
int main() 
  int a,b,c;
  printf("Informe um número:");
  scanf("%d", &a);
  printf("informe outro número:");
  scanf("%d", &b);
  printf("%d-%d=%d", a,b, c);

  return 0;
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