How do you generate Armstrong series in c plus plus?

Answer 1

#include <iostream>

#include <math.h> // for std::pow()

unsigned int get_length(unsigned int num,const unsigned int base=10)

{

unsigned int len=1;

while(num && (num/=base))

++len;

return( len );

}

bool is_armstrong(const unsigned int num,const unsigned int base=10)

{

unsigned int len=get_length(num,base);

unsigned int sum=0;

unsigned int tmp=num;

while(tmp)

{

sum+=(unsigned int)std::pow((double)(tmp%base),(double)len);

tmp/=base;

}

return(num==sum);

}

int main()

{

std::cout << "Armstrong series (base 10):";

for(unsigned int num=0; num<=0xffffffff; ++num)

if(is_armstrong(num))

std::cout << " " << num;

std::cout << std::endl;

return(0);

}