output formatting (aligning decimal point)

Can someone tell me what I am mis-understanding or if there is something I need to do? My code is this:

Code:

---

#include <stdio.h>

int main (void)
{
int diameter=1;
double radius;

printf("enter diameter to calculate radius:\n");

while(diameter > 0)
{
scanf("%d",&diameter);

radius = diameter / 2;
printf("diam\tradius\n");
printf("\n%4d\t%4.2f\n",diameter, radius);
}
return 0;
}

---

say I input 10 then 20

my output needs to look like this:
enter diameter to calculate radius:
10
diam radius

10 5.00
20
diam radius

20 10.00

NOT LIKE THIS:
enter diameter to calculate radius:
10
diam radius

10 5.00
20
diam radius

20 10.00

I thought because I did %4.2f that there would be 4 columns total so that the 5.00 would have a blank space before the 5

Thanks for your help

I tried it and it looks all good... whats the problem exactly?

Code:

---

enter diameter to calculate radius:
10
diam    radius

  10    5.00
20
diam    radius

  20    10.00

---

Ohhh i see what you mean, you want the decimal in the same column? The mistake is that %4 is four characters, not four numbers. Change it to %5.2 and it works, remember that 10.00 is five characters including the decimal point.

Code:

---

enter diameter to calculate radius:
10
diam    radius

  10    5.00
20
diam    radius

  20  10.00

---

ahhh thanks you