C program to add, average and deviation of numbers:

void main()

{

                int sum=0,a[10],i;

                float avg=0,dev,vari=0,var;

                printf("Enter 10 interger \n");

                for(i=0;i<10;i++)

                {

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

                                sum=sum+a[i];

                }

                avg=sum*0.1;

                for(i=0;i<10;i++)

                                var=var+pow((a[i]-avg),2);

                vari=var/10;

                dev=sqrt(vari);

                printf(" Sum = %d \n Avrage= %f \n Variance = %f \n Deviation = %f \n",sum,avg,vari,dev);

                getch();

}