C Program to implement the Prim’s algorithm. Prims algorithm is a greedy algorithm that finds the minimum spanning tree of a graph. Graph should be weighted, connected, and undirected. Read more about C Programming Language .

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#include<stdio.h>

#include<conio.h>

int a,b,u,v,n,i,j,ne=1;

int visited[10]={0},min,mincost=0,cost[10][10];

void main()

{

clrscr();

printf("n Enter the number of nodes:");

scanf("%d",&n);

printf("n Enter the adjacency matrix:n");

for(i=1;i<=n;i++)

for(j=1;j<=n;j++)

{

scanf("%d",&cost[i][j]);

if(cost[i][j]==0)

cost[i][j]=999;

}

visited[1]=1;

printf("n");

while(ne<n)

{

for(i=1,min=999;i<=n;i++)

for(j=1;j<=n;j++)

if(cost[i][j]<min)

if(visited[i]!=0)

{

min=cost[i][j];

a=u=i;

b=v=j;

}

if(visited[u]==0 || visited[v]==0)

{

printf("n Edge %d:(%d %d) cost:%d",ne++,a,b,min);

mincost+=min;

visited[b]=1;

}

cost[a][b]=cost[b][a]=999;

}

printf("n Minimun cost=%d",mincost);

getch();

}

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## 6 comments on “C Program to find a minimum spanning tree using Prim’s algorithm”

It will be helpful if you display the output also…

Hello,

Thanks for your feedback. Will consider that.

Easy coding Superb..

But Number of variables get longer..

Thank You

well done

simpiy superb

well done