C code to print or display lower triangular matrix

#include<stdio.h>

int main(){

  int a[3][3],i,j;

  float determinant=0;

  printf("Enter the 9 elements of matrix: ");

  for(i=0;i<3;i++)

      for(j=0;j<3;j++)

           scanf("%d",&a[i][j]);

  printf("\nThe matrix is\n");

  for(i=0;i<3;i++){

      printf("\n");

      for(j=0;j<3;j++)

           printf("%d\t",a[i][j]);

  }

   printf("\nSetting zero in upper triangular matrix\n");

   for(i=0;i<3;i++){

      printf("\n");

      for(j=0;j<3;j++)

           if(i<=j)

             printf("%d\t",a[i][j]);

           else

             printf("%d\t",0);

  }

   return 0;

}

Enter the 9 elements of matrix: 1

2

3

4

5

6

7

8

9

The matrix is

1       2       3

4       5       6

7       8       9

Setting zero in upper triangular matrix

1       2       3

0       5       6

0       0       9