Implementation of Dijkstra's algorithm(Finding shortest path) using C language

C Program to implement Dijkstra's algorithm. Dijkstra's Algorithm finds the shortest path with the lower cost in a Graph. Dijkstra's Algorithm solves the Single Source Shortest Path problem for a Graph. It is a Greedy algorithm and similar to Prim's algorithm. Read more about C Programming Language .

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#include "stdio.h"

#include "conio.h"

#define infinity 999

void dij(int n,int v,int cost[10][10],int dist[])

{

 int i,u,count,w,flag[10],min;

 for(i=1;i<=n;i++)

  flag[i]=0,dist[i]=cost[v][i];

 count=2;

 while(count<=n)

 {

  min=99;

  for(w=1;w<=n;w++)

   if(dist[w]

    min=dist[w],u=w;

  flag[u]=1;

  count++;

  for(w=1;w<=n;w++)

   if((dist[u]+cost[u][w]

    dist[w]=dist[u]+cost[u][w];

 }

}

void main()

{

 int n,v,i,j,cost[10][10],dist[10];

 clrscr();

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

 scanf("%d",&n);

 printf("\n Enter the cost 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]=infinity;

  }

 printf("\n Enter the source matrix:");

 scanf("%d",&v);

 dij(n,v,cost,dist);

 printf("\n Shortest path:\n");

 for(i=1;i<=n;i++)

  if(i!=v)

   printf("%d->%d,cost=%d\n",v,i,dist[i]);

 getch();

}

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