#include <stdio.h>
#include <math.h>
double to_num(int whole_part, int fract_part, int exponent);
int chars_of(int n);
int main(void) {
// say .1e0 + .2e0 == .3e0; # False
printf(" .1e0 + .2e0 == .3e0 ; # %s\n",
to_num(0, 1, 0) + to_num(0, 2, 0) == to_num(0, 3, 0) ? "True" : "False");
// say 1.0e-1 + 2.0e-1 == 3.0e-1; # True;
printf("1.0e-1 + 2.0e-1 == 3.0e-1; # %s\n",
to_num(1, 0, -1) + to_num(2, 0, -1) == to_num(3, 0, -1) ? "True" : "False");
return 0;
}
double to_num(int whole_part, int fract_part, int exponent) {
double num;
whole_part *= pow(10, chars_of(fract_part));
whole_part += fract_part;
num = whole_part / pow(10, chars_of(fract_part));
if (num)
num *= pow(10.0, (double) exponent);
return num;
}
int chars_of(int n) {
int chars = 1;
while ((n /= 10) != 0)
chars++;
return chars;
}
