C Program to Compute Determinant of a Matrix

This C program computes the determinant of a matrix.

Here is the source code of the C program to find determinant of a matrix. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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#include<stdio.h>
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int main(){
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  int a[3][3], i, j;
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  long determinant;
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  printf("Enter the 9 elements of matrix: ");

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  for(i = 0 ;i < 3;i++)
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      for(j = 0;j < 3;j++)
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           scanf("%d", &a[i][j]);
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  printf("\nThe matrix is\n");
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  for(i = 0;i < 3; i++){
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      printf("\n");
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      for(j = 0;j < 3; j++)
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           printf("%d\t", a[i][j]);
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  }
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```

  determinant = a[0][0] * ((a[1][1]*a[2][2]) - (a[2][1]*a[1][2])) -a[0][1] * (a[1][0]

   * a[2][2] - a[2][0] * a[1][2]) + a[0][2] * (a[1][0] * a[2][1] - a[2][0] * a[1][1]);

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  printf("\nDeterminant of 3X3 matrix: %ld", determinant);

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   return 0;
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}
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$ gcc determinant.c -o determinant
$ ./determinant
 
Enter the 9 elements of matrix: 1 2 3 4 5 1 2 3 4
The matrix is
 
1	2	3	
4	5	1	
2	3	4	
Determinant of 3X3 matrix: -5

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