C Program to check if a given matrix is an identity matrix


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C Program to check if a given matrix is an identity matrix or not. If I is theIdentity Matrix,then for any matrix A, IA=AI=A. Program will check the givan matrix is identity or not, and prints the appropriate message.

Program

#include <stdio.h>
void main() {
int A[10][10];
int i, j, R, C, flag =1;
printf("Enter the order of the matrix A\n");
scanf("%d %d", &R, &C);
printf("Enter the elements of matrix A\n");
for (i=0; i<R; i++) {
for (j=0; j<C; j++) {
scanf("%d",&A[i][j]);
}
}
printf("MATRIX A is\n");
for (i=0; i<R; i++) {
for (j=0; j<C; j++) {
printf("%3d",A[i][j]);
}
printf("\n");
}
/* Check for unit (or identity) matrix */
for (i=0; i<R; i++) {
for (j=0; j<C; j++) {
if((A[i][i] != 1) || (( i != j) && (A[i][j] != 0))) {
flag = 0;
break;
}
}
}
if(flag == 1 )
printf("It is identity matrix\n"); else
printf("It is not a identity matrix\n");
}






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