Write a function in c that would return single digit sum of a number.     Ex. Given: 195 the function returns 6 ->  1+9+5=15 then 1+5=6    Given: 711 the function returns 9 ->  7+1+1=9

C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter7: User-defined Simple Data Types, Namespaces, And The String Type
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Write a function in c that would return single digit sum of a number.  

 

Ex. Given: 195 the function returns 6 ->  1+9+5=15 then 1+5=6 

 

Given: 711 the function returns 9 ->  7+1+1=9 

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