Graph-Adjacency Matrix



/* Graph representation using adjacency matrix and finding the degree */
#include <stdio.h>

int adj[50][50],n;
void read()
{ int ad;
printf("Enter the Number of vertices\n");
scanf("%d",&n);

// storing element from [1][1]
//// assuming the vertices are numbered v1 v2..vn and we will enter only the index 1,2...n
for(int i=1;i<=n;i++)
{
printf("Enter the list of vertices adjacent to v%d -1 to stop\n",i);
while(1)
{
    scanf("%d",&ad);
    if(ad==-1) break;
        adj[i][ad]=1;
}
}
}//end of read
void disp()
{
printf("Adjacency Matrix..\n");
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
printf("%5d",adj[i][j]);
printf("\n");
}
}
void calculateDegree() {
    int i, j;

    printf("Vertex\tDegree\n");
    for (i = 1; i <=n; i++) {
        int degree = 0;
        for (j = 1; j <= n; j++) {
            if (adj[i][j] == 1) {
                degree++;
            }
        }
        printf("v%ddegree=%d\n", i + 1, degree);
    }
}
int main()
{
read();
disp();
calculateDegree();
return 0;
}

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