C > Beginners Lab Assignments

Program to find Determinant of a Matrix

Program to find Determinant of a Matrix

#include<stdio.h>
#include<conio.h>
#define LIMIT 10
void main()
{
  int chckdgnl();
  float deter();
  float a[LIMIT][LIMIT],value;
  int i,j,order;
  clrscr();
  printf("Enter order of determent :");
  scanf("%d",&order);
  for(i=0;i<order;i++)
  {
	for(j=0;j<order;j++)
	{
	  printf("Enter (%d,%d) element of the determent :",i+1,j+1);
	  scanf("%f",&a[i][j]);
	}
  }

  if(chckdgnl(a,order)==0)
	 value=0;
  else
	 value=deter(a,order);
  printf("Determinent Value :%f",value);
  getch();
}

float deter(float a[][LIMIT],int forder)
{
  int i,j,k;
  float mult;
  float deter=1;
  for(i=0;i<forder;i++)
  {
	for(j=0;j<forder;j++)
	{
	  mult=a[j][i]/a[i][i];
	  for(k=0;k<forder;k++)
	  {
		if(i==j) break;
		a[j][k]=a[j][k]-a[i][k]*mult;
	  }
	}
  }
  for(i=0;i<forder;i++)
  {
	deter=deter*a[i][i];
  }
  return(deter);
}


int chckdgnl(float array[][LIMIT],int forder)
{
  int i,j,k;
  float nonzero;
  for(i=0;i<forder;i++)
  {
	 if(array[i][i]==0)
	 {
		for(j=0;j<forder;j++)
		{
		  if(array[i][j]!=0)
		  {
			 k=j;
			 break;
		  }
		  if(j==(forder)) //forder-1
			 return(0);
		}
		for(j=0;j<forder;j++)
		{
		  array[j][i]=array[j][i]-array[j][k];
		}
	 }
  }
  return(1);
}