print float simple
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#include <stdio.h>
#include <stdint.h>
#include <math.h>
void print_upper(double v, size_t i) {
if(i == 0 || v >= 1) {
print_upper(v / 10, i + 1);
putchar('0' + (size_t)fmod(v, 10));
}
}
void print_lower(double v_raw, size_t c) {
bool pdot = false;
size_t np = 0;
size_t acc = 10;
for(size_t i = 0; i < c; ++i) {
double v = v_raw * acc;
size_t pv = (size_t)fmod(v, 10);
if(pv == 0) {
np += 1;
} else {
if(pdot == false) {
putchar('.');
pdot = true;
}
for(size_t j = 0; j < np; ++j) {
putchar('0');
}
np = 0;
putchar('0' + pv);
}
acc *= 10;
}
}
void print_float(double v) {
if(*(uint64_t *)&v & 0x8000000000000000) {
putchar('-');
v = -v;
}
print_upper(v + 0.0005, 0);
print_lower(v + 0.0005, 3);
}
void pf(double v) {
print_float(v); putchar('\n');
}
int main() {
uint64_t negative_zero = 0x8000000000000000;
pf(*(double *)&negative_zero);
pf(0);
pf(-9.1235);
pf(-9.1234);
pf(5561134);
pf(29.9995);
pf(700.0);
return 0;
}
Cpp
INFO