四方定理代码

#include <stdio.h>
#include <math.h>
int mode_1(int n)//开方表达式
{if ((int)sqrt(n) * (int)sqrt(n) == n){printf("%d * %d = %d \n", (int)sqrt(n), (int)sqrt(n), n);return 1;}else{return 0;}
}int mode_2(int n)//求方二
{int x, y;for (x = 1; x < sqrt(n); x++)for (y = x; y < sqrt(n); y++){if (x * x + y * y == n){printf("%d^2 + %d^2 = %d\n", x, y, n);return 1;}}return 0;
}int mode_3(int n)//求方三
{int x, y, z;for (x = 1; x < sqrt(n); x++)for (y = x; y < sqrt(n); y++)for (z = y; z < sqrt(n); z++){if (x * x + y * y + z * z == n){printf("%d^2 + %d^2 + %d^2 = %d\n", x, y, z, n);return 1;}}return 0;
}int mode_4(int n)//求方4
{int x, y, z, t;for (x = 1; x < sqrt(n); x++)for (y = x; y < sqrt(n); y++)for (z = y; z < sqrt(n); z++)for (t = z; t < sqrt(n); t++)if (x * x + y * y + z * z + t * t == n){printf("%d^2 + %d^2 + %d^2 + %d^2 = %d\n", x, y, z, t,n);return 1;}return 0;
}void proveFourSquares(int n)
{if (mode_1(n))printf("it has verified one squares\n");if (mode_2(n))printf("it has verified two squares\n");if (mode_3(n))printf("it has verified three squares\n");if (mode_4(n))printf("it has verified four squares\n");
}int main(int argc, char *argv[])
{int n;printf("please input a natural number\n");scanf("%d", &n);printf("--------------------------\n");proveFourSquares(n);return 0;
}