pow works with double (floating point) values, not integers, and when
you assign the result to an integer, it truncates. You will be better
off, both in speed and correctness, to just use r*r*r instead of pow(r,
3).
Don
On Aug 30, 1:06 am, Mohit Gupta <mohitgupta.n...@gmail.com> wrote:
> *1.*
> /* Print armstrong numbers from 1 to 500 */
> /*1st version of prgrm: I am using pow function*/
> #include<stdio.h>
> #include<conio.h>
> #include<math.h>
> int main()
> {
> int num=1,temp,sum,r;
> while(num<=500){
> sum=0;
> temp=num;
> while(temp){
> r=temp%10;
> sum+=pow(r,3);
> temp/=10;
> }
> if(sum==num)
> printf("%d\n",num);
> num++;}
>
> getch();
> return 0;
>
> }
>
> It prints :
> 1
> 370
> 371
> 407
>
> But it does not print 153 which is also armstrong number. WHY???
>
> BUT if I change: pow(r,3) to r*r*r in code....then it prints:
> 1
> 153
> 370
> 371
> 407
>
> WHY 153 was not printed if i use pow() function???
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