sum up a numeric string (1111 = 1+1+1+1=4)

Question

#Develop a program that reads a four-digit integer from the user and displays the sum of the digits in the number. For example, if the user enters 3141 then your program should display 3+1+4+1=9.

ri = input("please enter four digits")
if len(ri) == 4 and ri.isnumeric() == True:
    print(ri[0]+ri[1]+ri[2]+ri[3])
else:
    print("Error: should be four digits!")

How do I do this? Haven't seen something like this before I'm sure, and as you can see my code fails....

convert all chars from string to int with e.g. `int(ri[0])` – matszwecja Nov 02 '22 at 09:28 — matszwecja, Nov 02 '22 at 09:28

Алексей Р · Answer 1 · 2022-11-02T09:43:55.900

0

ri = input("please enter four digits: ")
if len(ri) == 4 and ri.isnumeric():
    print(f'{ri}={"+".join(ri)}={sum(map(int, ri))}')
else:
    print("Error: should be four digits!")

please enter four digits: 3141
3141=3+1+4+1=9

edited Nov 02 '22 at 09:43

answered Nov 02 '22 at 09:33

Алексей Р

7,507
2
7
18

score 0 · Accepted Answer · answered Nov 02 '22 at 09:34

0

ri = input("please enter four digits: ")
res = 0
for n in ri:
    res += int(n)
print (ri[0]+"+"+ri[1]+"+"+ri[2]+"+"+ri[3]+"="+str(res))

answered Nov 02 '22 at 09:34

sat

91
8

9001_db · Answer 3 · 2022-11-03T08:48:08.367

0

ri = input("please enter some digits: ")
try:
    print("Digit sum: " + str(sum([int(x) for x in ri])))
except:
    raise ValueError("That was no valid number!")

For this solution, the length of the input does not matter.

edited Nov 03 '22 at 08:48

answered Nov 02 '22 at 09:35

9001_db

81
10

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Nov 04 '22 at 16:14

user99999 · Answer 4 · 2022-11-02T09:51:50.667

Here is a one-liner for that. The length of the input doesn't matter to this one. Its up to you what to specify for the length or to take the length check away completely.

ri = input('please enter four digits:')
if len(ri) == 4 and ri.isnumeric():
    print('+'.join(i for i in ri), '=', str(sum([int(a) for a in ri])))
else:
    print('Error: should be four digits')

Output:

please enter four digits: 3149
3+1+4+9 = 17

caf9 · Answer 5 · 2022-11-02T09:35:07.257

-1

Edit for better answer

input_string = input("Enter numbers")
output_string = ""
sum = 0
count = 0
for n in input_string:
    if count < len(input_string)-1:
        output_string += str(n) + "+"
    else:
        output_string += str(n) + "="
    sum += int(n)
    count += 1
output_string += str(sum)

print (output_string)

Output:

1+1+1+1=4

edited Nov 02 '22 at 09:35

answered Nov 02 '22 at 09:28

caf9

19
6

1

You shouldn't call the variable `input` nor `sum` - these are python built-ins. – matszwecja Nov 02 '22 at 09:28

sum up a numeric string (1111 = 1+1+1+1=4)

5 Answers5