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| #include <stdio.h>
#define N 100
int factorsum( int number );
void PrintPN( int m, int n );
int main()
{
int i, m, n;
scanf("%d %d", &m, &n);
if ( factorsum(m) == m ) printf("%d is a perfect number\n", m);
if ( factorsum(n) == n ) printf("%d is a perfect number\n", n);
PrintPN(m, n);
return 0;
}
int factorsum( int number ){
int a[N],i,j=0,n=0,sum=0;
if(number == 1)
return 1;
for(i=1;i<number;i++)
if(number%i==0){
a[j++]=i;
}
for(i=0;i<j;i++)
sum+=a[i];
if(sum == number)
return 1;
return 0;
}
void PrintPN( int m, int n ){
int i,j,k=0,l,a[N];
if(m==1){
printf("%d = %d\n",m , m);
m+=1;
}
for(i=m;i<=n;i++){
if(factorsum(i)==1){
for(j=1;j<i;j++){
if(i%j==0){
a[k++]=j;
}
}
printf("%d = ", i);
for(l=0;l<k-1;l++)
printf("%d + ", a[l]);
printf("%d\n", a[l]);
k=0;
}
}
}
}
|
