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Print binary representation of a floating point number in C
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| #include <stdint.h> | |
| #include <stdio.h> | |
| typedef union v32_union { | |
| float f; | |
| uint32_t u; | |
| } v32; | |
| typedef union v64_union { | |
| double f; | |
| uint64_t u; | |
| } v64; | |
| void print_float_bits (float f) { | |
| v32 v; v.f = f; | |
| uint32_t mask = 1 << 31; | |
| do { | |
| if (mask == 0x40000000 || mask == 0x400000) putchar(' '); | |
| putchar(v.u & mask ? '1' : '0'); | |
| } while (mask >>= 1); | |
| } | |
| void print_double_bits (double d) { | |
| v64 v; v.f = d; | |
| uint64_t mask = 1ULL << 63; | |
| int count = 63; | |
| do { | |
| if (mask == 0x4000000000000000 || mask == 0x8000000000000) putchar(' '); | |
| putchar(v.u & mask ? '1' : '0'); | |
| count--; | |
| } while (mask >>= 1); | |
| } | |
| int main(void) { | |
| float a = 3.1415926f; | |
| double b = 3.141592653589793238; | |
| print_float_bits(a); /* 0 10000000 10010010000111111011010 */ | |
| putchar('\n'); | |
| print_double_bits(b); /* 0 10000000000 1001001000011111101101010100010001000010110100011000 */ | |
| } |
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works pretty well it even follows the IEEE754 standard thank you