57 lines
794 B
C
57 lines
794 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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int power(int a, int x) //a的x次方运算
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{
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if (x < 0)
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{
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printf("输入错误，请重新输入！\n");
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return -1;
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}
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else
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{
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int sum = 1;
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for (int i = 0; i < x; i++)
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{
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sum *= a;
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}
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return sum;
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}
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}
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int main()
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{
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int n;
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printf("请输入一个正整数n（3 ≤ n ≤ 7）：");
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scanf("%d", &n);
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if (n < 3 || n > 7)
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{
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printf("输入错误，请重新输入！\n");
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}
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else
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{
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int lower = power(10, n - 1); //n位数的最小值
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int upper = power(10, n) - 1; //n位数的最大值
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for (int num = lower; num <= upper;num++) //缩小范围，减少运算量
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{
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int sum=0;
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int m = num;
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while(m>0)
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{
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int a = m % 10;
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sum += power(a,n);
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m /= 10;
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}
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if (num==sum)
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{
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printf("%d\n", sum);
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}
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}
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}
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return 0;
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} |