How to see float or double in binary format?

Question

C++ / C#

How to represent float or double in binary format?

Answer 1

$ cat > dump-fp.c <<EOF
#include <inttypes.h>
#include <string.h>
#include <stdio.h>

void dump_float(float v)
{
    uint32_t i;
    memcpy(&i, &v, sizeof(i));
    printf("0x%08"PRIx32"\n", i);
}

void dump_double(double v)
{
    uint64_t i;
    memcpy(&i, &v, sizeof(i));
    printf("0x%016"PRIx64"\n", i);
}

int main(void)
{
    dump_float(1.0f);
    dump_double(1.0l);
    return 0;
}
EOF
$ gcc dump-fp.c -o dump-fp 
$ ./dump-fp 
0x3f800000                                                                                                                                                                                                                                                                     
0x3ff0000000000000