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Author: skjha1

Matrix/02 Lower Tringular matrix.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <stdlib.h>
+struct Matrix
+{
+ int *A;
+ int n;
+};
+void Set(struct Matrix *m,int i,int j,int x)
+{
+ if(i>=j)
+ m->A[m->n*(j-1)+(j-2)*(j-1)/2+i-j]=x; // using column major formula 
+}
+int Get(struct Matrix m,int i,int j)
+{
+ if(i>=j)
+ return m.A[m.n*(j-1)+(j-2)*(j-1)/2+i-j];
+ else
+ return 0;
+}
+void Display(struct Matrix m)
+{
+ int i,j;
+ for(i=1;i<=m.n;i++)
+ {
+ for(j=1;j<=m.n;j++)
+ {
+ if(i>=j)
+ printf("%d ",m.A[m.n*(j-1)+
+(j-2)*(j-1)/2+i-j]);
+ else
+ printf("0 ");
+ }
+ printf("\n");
+ }
+}
+int main()
+{
+ struct Matrix m;
+ int i,j,x;
+
+ printf("Enter Dimension\n");
+ scanf("%d",&m.n);
+ m.A=(int *)malloc(m.n*(m.n+1)/2*sizeof(int));
+ printf("enter all elements");
+ for(i=1;i<=m.n;i++)
+ {
+ for(j=1;j<=m.n;j++)
+ {
+ scanf("%d",&x);
+ Set(&m,i,j,x);
+ }
+ }
+ printf("\n\n");
+ Display(m);
+
+
+ return 0;
+}