problems with float-type functions
this is a homework so were not supposed to use some commands which might make this hell of a lot easier. the users enters a decimal number and the programs stores it as an numerical string. im supposed to make it return the numerical string in float, hence, declaring the function a float. here's my code:
Code:
float toFloat(void)
{
float num = 0, dec = 0, temphold, ans;
double multiplier = 1;
char s[100];
int x = 0, counter = 0, stopper = 0;
printf("string? ");
scanf("%s", &s);
printf("\nYour string: %s", s);
for(x = 0;s[x] != '\0';x++)
{
if(s[x] == '.')
{
printf("\ndecimal piot detected");
x++;
for(x = x ; s[x] != '\0' ; x++)
{
multiplier = multiplier / 10;
temphold = s[x] - '0';
dec = dec + (temphold * multiplier);
printf("\nx: %c", s[x]);
printf("\ntemphold: %f", temphold);
printf("\nmultiplier: %f", multiplier);
printf("\ndec: %f", dec);
stopper = 1;
}
}
else if(stopper == 0)
{
counter++;
printf("\ncounter: %d", counter);
}
}
printf("\n\nDIVISION\n\n");
x = counter - 1;
multiplier = 1;
printf("\nx1: %d", x);
while(counter > 0)
{
temphold = (s[x] - '0');
printf("\ntemphold: %f", temphold);
num = num + (temphold * multiplier);
printf("\nmulti: %f", multiplier);
printf("\nx: %c", s[x]);
printf("\nnum: %f", num);
multiplier = multiplier * 10;
x--;
counter--;
}
ans = num + dec;
printf("\n\n%g", ans);
return ans;
}
my main problem is i cant seem to make it return the float value as it should. eg. input = 123.45, it should return 123.45, not 112347... another problem is that there are random really small numbers (eg. 0.00002) suddenly appearing, but i dont really mind those things. i used %g so that those numbers wont show up. im still a first year computer science student so there might be things that i dont know or stupid things i put in my code so dont be too harsh on me :D
you may also notice a lot of printfs there, im using it to trace my code, just to be sure.
thanks :D
ps. one of my friends told me that its impossible to return exactly 123.45, but he's also not sure
