Prime Number in C:

#include <stdio.h>
main()
{
int a, b, c, n=0, start, end, sum=0;
printf(" Start");
scanf("%d", &start);
printf("End");
scanf("%d", &end);

for(a=start;a<=end;a++)
{
c=1;
for(b=2;b<=a/2;b++)
{
if(a%b==0)
{
c=0;
break;
}
}
if(c==1)
{
sum+=a;
n++;
}
}
printf("The Sum of Prime numbers is: %d\n and Total prime numbers is: %d", sum, n);
getch();
return 0;
}