foo.c: In function 'main':
foo.c:51:46: error: 'temp' undeclared (first use in this function); did you mean 'temp3'?
   51 |                                         if(a[temp+100]==0)
      |                                              ^~~~
      |                                              temp3
foo.c:51:46: note: each undeclared identifier is reported only once for each function it appears in

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