loop to find the sum

[youichi]

I want to ask the user to input a number . After that ,the programme ask if he want to input a number again .i know how to make the loop. However, i don"t understand how to calaculate the sum of those number as i don"t know how many number the user will input

Another question is how can i convert lowercase to uppercase

Thx a lot

[abiz]

I had the exact same homework assignment like this, my solution was

#include <iostream>
using namespace std;

int main()
{
    double num[10], sum=0;
    int i=0;
    char option;
    while (option!='n'){
        cin >> num[i];
        cin >> option;
        sum=sum+num[i];
        i++;
        }
    cout << sum << endl;
    
    system ("pause");
    return 0;
}

its not very good, but it works :)

cin >> num[i];

enters a number into the array

cin >> option;

if user enters "n" it will exit the loop

sum=sum+num[i];

sums up the array

[cdlang]

@youichi

I think you can do it like that:

while (cin >> number) { //if input is a number,save it. if not, quit the loop.
    sum += number;
    ++times;
}

You can use C function "toup(c)" to convert a char to uppercase.
Then you can write a loop to convert a string to uppercase.