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Prim.c

@@ -0,0 +1,130 @@
+#include <stdio.h>
+#include<stdbool.h>
+#define infinity 9999
+#define max 20
+
+int matrix[max][max],spanning[max][max],n;
+
+int prims()
+{
+    int cost[max][max];
+	int u,v,min_distance,distance[max],from[max];
+	int visited[max],no_of_edges,i,min_cost,j;
+
+	for(i=0;i<n;i++)
+		for(j=0;j<n;j++)
+		{
+			if(matrix[i][j]==0)
+				cost[i][j]=infinity;
+			else
+				cost[i][j]=matrix[i][j];
+				spanning[i][j]=0;
+		}
+	distance[0]=0;
+	visited[0]=1;
+
+	for(i=1;i<n;i++)
+	{
+		distance[i]=cost[0][i];
+		from[i]=0;
+		visited[i]=0;
+	}
+
+	min_cost=0;
+	no_of_edges=n-1;
+
+	while(no_of_edges>0)
+	{
+		min_distance=infinity;
+		for(i=1;i<n;i++)
+			if(visited[i]==0&&distance[i]<min_distance)
+			{
+				v=i;
+				min_distance=distance[i];
+			}
+
+		u=from[v];
+
+		spanning[u][v]=distance[v];
+		spanning[v][u]=distance[v];
+		no_of_edges--;
+		visited[v]=1;
+
+		for(i=1;i<n;i++)
+			if(visited[i]==0&&cost[i][v]<distance[i])
+			{
+				distance[i]=cost[i][v];
+				from[i]=v;
+			}
+
+		min_cost=min_cost+cost[u][v];
+	}
+	return min_cost;
+}
+
+int main()
+{
+    int i,j,total_cost;
+    printf("Enter total nodes : ");
+    scanf("%d", &n);
+    char alpha[] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t'};
+
+    for(i=0;i<n;i++)
+    {
+
+        for(j=0;j<n;j++)
+        {
+            printf("Enter distance from %c to %c node : ", alpha[i], alpha[j]);
+            scanf("%d", &matrix[i][j]);
+            if(j==(n-1))
+            {
+                printf("\n");
+            }
+        }
+
+    }
+    printf("\nAdjacency tree matrix:\n");
+    printf("  ");
+    for(i=0;i<n;i++)
+    {
+        printf("%c ", alpha[i]);
+    }
+    printf("\n");
+    for(i=0;i<n;i++)
+    {
+        printf("%c ", alpha[i]);
+        for(j=0;j<n;j++)
+        {
+            printf("%d", matrix[i][j]);
+            if(j==(n-1))
+            {
+                printf("\n");
+            }
+        }
+    }
+    total_cost = prims(matrix, n);
+
+    printf("\nSpanning tree matrix:\n");
+
+    printf("  ");
+    for(i=0;i<n;i++)
+    {
+        printf("%c ", alpha[i]);
+    }
+    printf("\n");
+    for(i=0;i<n;i++)
+    {   
+        printf("%c ", alpha[i]);
+        for(j=0;j<n;j++)
+        {
+            printf("%d ", spanning[i][j]);
+            if(j==(n-1))
+            {
+                printf("\n");
+            }
+
+        }
+    }
+    printf("\n\nTotal cost of spanning tree=%d",total_cost);
+    return 0;
+}