四方定理
一個整數可以由四個數的平方相加得到?
#include<iostream> using namespace std; int main() {long i, j, k, l, n;cout << "輸入一個數" << endl;cin >> n;for (i = 0; i <= n; i++)for (j = 0; j <= i; j++)for (k = 0; k <= j; k++)for (l = 0; l <= k; l++){if (i*i + j*j + k*k + l*l == n){cout << i << j << k << l << endl;/*exit(0);*/}}system("pause");return 0; }總結