用c语言编程 求n阶行列式

#include"stdio.h"
#define n 100
int main()
{
int i, j, t, g, h, f = 1, N;
double m, k[n], a[n][n], detA = 1;
printf("请输入行列式的阶:\n");
scanf_s("%d", &N);
printf("请输入行列式:\n");
for (i = 1; i <= N; i++)
for (j = 1; j <= N; j++)
scanf_s("%lf", &a[i][j]);
for (i = 1; i < N; i++)
{
if (a[i][i] != 0)
m = a[i][i];
else
{
for (g = i; a[g][i] == 0 && g <= N; g++);
if (g == N + 1)
{
printf("detA=0");
return 0;
}
else
{
for (h = i; h <= N; h++)
{
a[i][h] = a[i][h] + a[g][h];
a[g][h] = a[i][h] - a[g][h];
a[i][h] = a[i][h] - a[g][h];
}
m = a[i][i];
f = f * (-1);
}
}
for (j = i + 1; j <= N; j++)
{
k[j] = a[j][i] / m;
for (t = i; t <= N; t++)
a[j][t] = a[j][t] - a[i][t] * k[j];
}
detA = detA * a[i][i];