c program using 2d array to check Indentity Matrix

c program using 2d array to check Indentity Matrix

1. #include<stdio.h>
2. int main()
3. {
4.  int array1[3][3],i,j,flag=0; 
5.  for ( i = 0; i < 3; i++ ){ //related to row
6.   for ( j = 0; j < 3; j++){ //related to column
7.   
8.     scanf("%d", &array1[i][j]) ;
9.   }   
10.  } 
11.  /* output each array element's value */ 
12.  for ( i = 0; i < 3; i++ ){ 
13.   for ( j = 0; j < 3; j++ ){ 
14.     printf(" %d\t ",array1[i][j] ); 
15.   } 
16.   printf("\n");
17.  } 
18.  for ( i = 0; i < 3; i++ ){ 
19.   for ( j = 0; j < 3; j++ ){ 
20.    if(array1[i][j] != 1 && array1[j][i] != 0 ) {
21.      flag=1; break;
22.    }
23.   } 
24.   printf("\n");
25.  }
26.  if(flag==0)
27.    printf("It is an Identity Matrix.");
28.  else
29.    printf("It is not an Identity Matrix.");
30.  return 0;
31. } 

Output

//Entered matrix elements

1 0 0

0 1 0

0 0 1

//Displayed 3×3 Matrix

1 0 0

 0 1 0

  0 0 1

//Shown result

It is an Indentity Matrix 

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