triange_validator.c

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#include <stdio.h>
#include <stdbool.h>

int
main ()
{
  printf ("Triangle Validator\n\n");
  float angles[] = { 0, 0, 0 };
  int i;
  float sum;
  for (i = 0; i < 3; i++)
    {
      while (angles[i] <= 0)
    	{
    	  printf ("Please enter angle #%i: ", i + 1);
    	  scanf ("%f", &angles[i]);
    	}
    	sum += angles[i];
    }
    bool valid = sum == 180;
    printf("Your triangle angles are %s", valid ? "valid" : "invalid");
    return !valid; // invert because exit codes are dumb
}