Question: in c program a) Write a program where the user can enter a number n. The program then outputs the sum of the digits of

in c program

a) Write a program where the user can enter a number n. The program then outputs the sum of the digits of the number n. The number n has a maximum of 9 digits (does not have to be checked; decimal number does not have to be checked either.) If a negative number is entered, an error message should appear. Input and output should correspond to the following examples

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