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    printf("%f %f\n",       inf / inf, -(inf / inf)); // -1.#IND00 -1.
+#IND00
    printf("%.4f %.4f\n",   inf / inf, -(inf / inf)); // -1.#IND -1.#I
+ND
    printf("%.10f %.10f\n", inf / inf, -(inf / inf)); // -1.#IND000000
+ -1.#IND000000

    printf("%g %g\n", inf / inf, -(inf / inf));      // -1.#IND -1.#IN
+D

print +( 10.0**20 + 1 ) - 10.0**20;;
0

print +( 10.0**20 - 10.0**20 ) + 1;;
1