Determinant of matrix 2

$det \left| \begin{matrix} 2 & 6 & 4 \\ -3 & 1 & 5 \\ 9 & 3 & 7 \end{matrix} \right| =\left[2(1)(7)+6(5)(9)+4(-3)(3)\right]-\left[9(1)(4)+3(5)(2)+7(-3)(6)\right]$

$=(14+270-36)-(36+30-126)$

$=248-(-60)$

$=248+60$

$=$ $\color{#D61F06}\boxed{\large 308}$

$\begin{aligned} \det\left(\begin{array}{cc}2&6&4\\-3&1&5\\9&3&7 \end{array}\right) & = (2)(1)(7) + (6)(5)(9) + (4)(-3)(3) - (2)(5)(3) - (6)(-3)(7) - (4)(1)(9) \\ & = 14 +270 - 36 - 30 + 126 - 36 \\ & = \boxed{308} \end{aligned}$

Here is the C program to find determinant of Any matrix, by Me :) Enjoy..

Please Include stdio.h, malloc.h and math.h header files as they are not showing here..

/* C program to find determinant of any matrix, by Vivek Sedani */


//Please Include stdio.h, malloc.h and math.h header files here I dont know why they are not showing here
   //also include conio.h If you are using TC
    #include"<stdio.h>"
#include <malloc.h>
#include <math.h>
//#include <conio.h> for TC only


#define min(a,b)(a<b?a:b);

int abcd(int a1,int a2,int x)
{
    if(a1<a2)
    {
        if(x>=a1&&x<=a2)
        {
            return x;
        }else return a1;
    }
    else{
        if(x>a2&&x<a1)
        {
            return a1;
        }else return x;
    }
}

float determinant(float **a,int row,int col,int s,int os)
 {
    int i,y,k;
    float det=0;
 if(1==s){
    det=a[row][col];
    }
 else
 {
    for(i=0;i<s;i++)
    {

    y=abcd(col,(col+s-1)%os,(col+i+1)%os);
    if((col+s-1)%os-col>0)
    k=1; else k=-1;
    det=det+a[row][(col+i)%os]*pow(-1,i)*k*determinant(a,(row+1)%os,y,s-1,os);
    }
 }
 return det;
}

void scanmatrix(float **a,int m,int n)
  {
  int i,j;
   for(i=0;i<m;i++)
   {
   printf("\n Enter %dth row :",i+1);
     for(j=0;j<n;j++)
      {
      scanf("%f",&a[i][j]);
      }
   }
 }

    void main()
     {
  int m,i;
  float **a,*ans,det;
  // clrscr(); for TC only
  printf("\nEnter size of the square matrix :");
  scanf("%d",&m);
  a=(float **)malloc(sizeof(float *)*m);
  for(i=0;i<m;i++)
   {
   a[i]=(float *)malloc(sizeof(float)*m);
   }

  scanmatrix(a,m,m);
  det=determinant(a,0,0,m,m);
  printf("\ndeterminant is %f ",det);
 // getch(); for TC only
}