Sum of 5 digits using recursion

A 5-digit positive integer is entered through the keyboard, write a function to calculate sum of digits of the 5-digit number Using recursion

#include<stdio.h>

void sum(int m)

void main()
{

int x,s;
printf("\nInput a 5 digit number");
scanf("%d",&x);
s=sum(x);
printf("\nThe sum of the digits is %d",s);
}

void sum(int m)
{
if(m==0)
return 0;
else
return(m%10+sum(m/10));
}

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