Sparse Matrix program using Double Linked List

Sparse Matrix using Double Linked List/sparseMatrix.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+struct node
+{
+	int row,col,data;
+	struct node *prev, *next;
+};
+
+struct node *getnode();
+struct node *insert(struct node*, int, int, int);
+void displayList(struct node*);
+void displayMatrix(struct node*, int, int);
+
+int main()
+{
+	struct node *list = NULL;
+	int nr,nc,num,row,col,data,i;
+	printf("Enter no. of rows and columns in the matrix:");
+	scanf("%d%d",&nr, &nc);
+	printf("Enter no. of non zero elements in the matrix: ");
+	scanf("%d",&num);
+	printf("Enter non zero elements of the matrix:\n");
+	for(i=0;i<num;i++)
+	{
+		printf("Row: ");
+		scanf("%d", &row);
+		printf("Column: ");
+		scanf("%d", &col);
+		printf("Data: ");
+		scanf("%d", &data);
+		list = insert(list, row, col, data);
+	}
+	printf("Entered List: \n");
+	displayList(list);
+	printf("Resultant Matrix: \n");
+	displayMatrix(list,nr,nc);
+	return 0;
+}
+
+struct node *getnode()
+{
+	struct node *newnode = (struct node*)malloc(sizeof(struct node));
+	newnode -> prev = newnode ->next = NULL;
+	return newnode;
+}
+
+struct node *insert(struct node *head, int r, int c, int d)
+{
+	struct node *newnode = getnode();
+	newnode -> row = r;
+	newnode -> col = c;
+	newnode -> data = d;
+	if(head == NULL)
+	{
+		head = newnode;
+	}
+	else
+	{
+		newnode -> next = head;
+		head -> prev = newnode;
+		head = newnode;
+	}
+	return head;
+}
+
+void displayList(struct node *head)
+{
+	if(head == NULL)
+	{
+		printf("List is Empty\n");
+		return;
+	}
+	struct node *temp = head;
+	printf("Row\tColumn\tData\n");
+	while(temp!=NULL)
+	{
+		printf("%d\t %d\t  %d\n",temp->row,temp->col,temp->data);
+		temp=temp->next;
+	}
+}
+
+void displayMatrix(struct node *head, int r, int c)
+{
+	int i,j,flag;
+	struct node *temp = head;
+	if(head == NULL)
+	{
+		printf("Matrix is Empty\n");
+		return;
+	}
+	for(i=0;i<r;i++)
+	{
+		for(j=0;j<c;j++)
+		{
+			temp = head;
+			flag = 0;
+			while(temp!=NULL)
+			{
+				if(temp->row == i && temp -> col == j)
+				{
+					printf("%d ",temp->data);
+					flag = 1;
+				}
+				temp=temp->next;
+			}
+			if(flag == 0)
+				printf("0 ");
+		}
+		printf("\n");
+	}
+}