Adding Numbers Generated By Random Number Generator in C - c

Question

before I ask my question I would like to point out that I did look for the answers already, and I didn't find what I was looking for.
Please bear in mind that I am a beginner in terms of programming, so please don't assume that I know everything there is to know.
Right, to the question.
My question is : How do I add together numbers that are created by random number generator ? The difficulty that I have is the fact that the number of randomly generated numbers could be different every time the program is ran. To make it clearer, the amount of randomly generated numbers is dependent on the input from user, eg if the input is 9, the program will generate 9 random numbers. This makes it difficult for me to come up with the idea of how to add the random numbers together and display them.
Here is the source code from my program. I think it is important to mention that the random numbers change every time I run the program, which is how I want them to be ( I used srand() with time, and rand() ). Also, the problem that I have currently is that the program doubles the last randomly generated number instead of adding them all together.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(void)
{
int input;
scanf("%d", &input);
int i;
int roll;
int turn_total;
time_t t;
int sum;
srand((unsigned) time(&t)); // the seed for the random number generator based on the current time
for( i = 0; i < input; i++)
{
roll = (rand() % 6 + 1); // random number generator
sum = roll+roll; // only dubbling the last roll for some reason = /
printf("You Rolled : %d\n", roll);
}
printf("The Total Turn Score is : %d", sum);
}
Any help, ideas or clues would be greatly appreciated.

Answer 1

Yo need to initialize sum first also you are not adding properly.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(void)
{
int input;
scanf("%d", &input);
int i;
int roll;
time_t t;
int sum = 0;
srand((unsigned) time(&t)); // the seed for the random number generator based on the current time
for( i = 0; i < input; i++)
{
roll = (rand() % 6 + 1); // random number generator
sum += roll; // only dubbling the last roll for some reason = /
printf("You Rolled : %d\n", roll);
}
printf("The Total Turn Score is : %d", sum);
}

Answer 2

Use
srand( ( unsigned int )time( NULL ) );
and initialize variable sum. For example
long long int sum = 0;
//...
sum += roll;
//...
printf( "The Total Turn Score is : %lld", sum );

Answer 3

Your program is doubling the number that was generated because that's what you tell it to do in this line:
sum = roll+roll;
Instead, you need to add the current roll to the current value of sum:
sum = sum + roll;
And you need to initialize sum to 0 so that you start by adding just the first roll.
Think about it like rolling a dice multiple times and writing down what it was each time. You roll it once and get a 3, so you write down 3. You roll it again and get a 6, so you add 6 to the previous roll to get 9. You roll again and get 2, so you add 2 to 9 and get 11, and so on. The variable sum is where you write down the new number after every roll, but you're adding to what you wrote down before.
The way you had it before, you were completely disregarding the previous rolls. rolls in the loop only refers to the latest roll that you performed, and since the loop ends at some point, sum will be left as the sum of the last value of roll. This is why you were getting double the last number.

Answer 4

replace
sum = roll+roll
with
sum = roll+sum;