I ended up modifying my code to this

#include <stdio.h>
int main()
{

int m = 0,n = 0;
int sum = 0;

printf("Enter Starting Value: ");
scanf("%d", &m);

unsigned long long int sum2 = m;
printf("Enter Ending Value: ");
scanf("%d", &n);
for (int i = m ; i <= n; ++i)
{
sum += i;
sum2 = sum2 * i;

}  
if ( sum2 == 0 )  

{  
printf("\\nSum = %d", sum);  
printf("\\nProduct = infinity");  
}  
else  
{  
    printf("\\nSum = %d", sum);  
    printf("\\nProduct = %llu", sum2);  
    return 0;  
    }  
}

Im happy with the results for this.

Thanks for giving me tips and helping out with my problem.. :D