#include <stdio.h>
#include <stdlib.h>
int main()
{
    int number;
    printf("Read the number :");
    scanf("%d",&number);
    int a=number%10;
    number=number/10;
    int b=number%10;
    number=number/10;
    int c=number%10;
    printf("the Sum of three digits : ");
    printf("%d%d%d",a,b,c);



    return 0;
}

Read the number :the Sum of three digits : 690