Thread: Summing Entries In A "for" Loop

Basically, say i wanted to sum all the values enter for x. First, i ask the user how many x's there are, then create a "for" loop to ask for x1, x2, x3, .. xn. Then i want to know the cumulative total of x. How would i do this?

This is the sample code i have made right now inside of my main function:

Code:

int N;
int I;
int X;


//This is where i ask for how many x's there are//


    printf("What is N?: ");
    scanf("%d", &N);
  
//This is the for loop//

    for(I=1;I<=N;I++){
        printf("the number is %d, what is X?: ", I);
        scanf("%d", &X);
    }
    
    printf("sum= %d", X);
    
    return 0;

When it runs, it looks like this:
What is N? (lets say 3)
the number is 1, what is x?(lets say 2)
the number is 2, what is x? ''
the number is 3, what is x? ''

the sum is: (it should say 6)


Sorry if this is confusing, I will try my best to further clarify things, just ask.

Your program will not compute the sum of anything. It will display the last number you enter. I suggest adding a line of code after the scanf that is inside the loop, adding X to another variable, that contains the total. You should also use more descriptive names for your variables. At first glance, it's impossible to know what N, I, and X are used for in your program. Changing N to inputCount would make more sense. You can use the same concept to rename your other variables.

Originally Posted by Al3x_Payn3

Is there a better way to write this?

Not really. This is a more-or-less ideal implementation. You could use the += operator on line 14, but that wouldn't really improve anything. It would just be another way of doing it, not better than the way you're already doing it.