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The f specification is for reading numbers of type
float.
The lf specification is for reading numbers of type
double.
The following program reads integers of type float and of type
double:
float sample_float;
double sample_double;
scanf ("%f%lf", &sample_float, &sample_double);
printf ("The float is %f; the double is %f\n",
sample_float, sample_double);
--- Data ---
32.000 128000e+10
--- Result ---
The float is 32.000000; the double is 1280000000000000.000000