C语言程序：求解完美数

#include<stdio.h>

int factorsum(int number);

int main() { int m, n, i; printf("Input m:"); scanf("%d", &m); printf("Input n:"); scanf("%d", &n); for(i=m; i<=n; i++) { if(factorsum(i)==i) { printf("%5d", i); } } }

int factorsum(int number) { int i, sum; if(number==1) { return 1; } sum=0; for(i=1; i<=number; i++) { if(number%i==0) { sum+=i; } } return sum; }