'float' vs. 'double' precision

Question

The code

float x  = 3.141592653589793238;
double z = 3.141592653589793238;
printf(\"x=%f\\n\", x);
printf(\"z=%f\\n\", z);
printf(\"x=%20.18f\\n\", x);
print         


        

Answer 1

float : 23 bits of significand, 8 bits of exponent, and 1 sign bit.

double : 52 bits of significand, 11 bits of exponent, and 1 sign bit.