/* Norm is the sum of the squars of all the elements of the matrix. */

#include<stdio.h>
#include<math.h>
main()
{ int i,j,n,m,a[10][10],sum=0;
double norm;
printf("\nEnter the dimensions:: ");
scanf("%d%d",&n,&m);
printf("\nEnter the eleents of matrix::\n");
for(i=0;i<n;i++)
for(j=0;j<m;j++)
scanf("%d",&a[i][j]);
printf("\nOriginal Matrix is:: ");
for(i=0;i<n;i++)
{ printf("\n");
for(j=0;j<n;j++)
printf("\t%d",a[i][j]);
}
for(i=0;i<n;i++)
for(j=0;j<m;j++)
{ sum+=(a[i][j] * a[i][j]);
}
norm=sqrt((double)sum);
printf("\nNORM:: %lf", norm);
}

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Can you please share your code, so that I can tell you what exactly the issue is. Because for me it’s working fine.