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SIMULATION OF ROUTING PROTOCOLS USING C


#include<stdio.h>
#include<ctype.h>
int graph[12][12];
int e[12][12];
int ad[12];
int no,id,adc,small,chosen,i,j,ch1,ch2;
char nodes[12]={"abcdefghijkl"};
int main()
{
adc=0;
printf("Enter The Number Of Nodes: ");
scanf("%d",&no);
printf("\nEnter The Values For Adjacency Matrix\n");
for(i=0;i <no;i++)
{
for(j=0;j <no;j++)
{
printf("Enter The Values For %d,%d Position: ",(i+1),(j+1));
scanf("%d",&graph[i][j]);
}
}
printf("\nEnter The Initial Estimates\t");
for(i=0;i <no;i++)
{
printf("\nEstimate For Node %c:\n",nodes[i]);
for(j=0;j <no;j++)
{
printf("To Node %c : ",nodes[j]);
scanf("%d",&e[i][j]);
}
}
do
{
printf("\nMENU:\n1.ROUTING INFO FOR NODE");
printf("\n2.ESTIMATED TABLE\n");
printf("Enter Your Choice: ");
scanf("%d",&ch1);
switch(ch1)
{
case 1:
printf("\nWhich Node Should Routing Table Be Built? (1-a)(2-b)...");
scanf("%d",&id);
id--;
adc=0;
printf("\nNeighbours For Particular Node ");
for(i=0;i <no;i++)
{
if(graph[id][i]==1)
{
ad[adc]=i;
adc++;
printf("%c",nodes[i]);
}
}
for(i=0;i <no;i++)
{
if(id!=i)
{
small=100;
chosen=1;
for(j=0;j <no;j++)
{
int total=e[ad[j]][i]+e[id][ad[j]];
if(total <100)
{
small=total;
chosen=j;
}
}
e[id][i]=small;
printf("\nShortest Estimate To %c is %d",nodes[i],small);
printf("\nNext Hop Is %c",nodes[ad[chosen]]);
}
else
e[id][i]=0;
}
break;
case 2:
printf("\n");
for(i=0;i <no;i++)
{
for(j=0;j <no;j++)
printf("%d ",e[i][j]);
printf("\n");
}
break;
}
printf("\nDo You Want To Continue?(1-YES) (2-NO): ");
scanf("%d",&ch2);
}
while(ch2==1);
return 0;
}

OUTPUT
$ cc simulation.c
$ ./a.out
Enter The Number Of Nodes: 2
Enter The Values For Adjacency Matrix
Enter The Values For 1,1 Position: 1
Enter The Values For 1,2 Position: 2
Enter The Values For 2,1 Position: 3
Enter The Values For 2,2 Position: 4
Enter The Initial Estimates
Estim ate For Node a:
To Node a : 1
To Node b : 2
Estimate For Node b:
To Node a : 1
To No de b : 2
MENU:
1.ROUTING INFO FOR NODE
2.ESTIMATED TABLE
Enter Your Choice: 1
Which Node Should Routing Table Be Built? (1-a)(2-b)...1
Neighbours For Particular Nodea
Shortest Estimate To b is 2
Next Hop Is a
Do You Want To Continue?(1-YES) (2-NO): 1
MENU:
1.ROUTING INFO FOR NODE
2.ESTIMATED TABLE
Enter Your Choice: 2
0 2
1 2
Do You Want To Continue?(1-YES) (2-NO): 2
$



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