Sum Of 3 Integers (Modular)

#include<stdio.h>

int ReadNumber(int nth)
{
    int n;

    printf("Please enter number %d: ", nth);
    scanf("%d%*c", &n);

    return(n);
}

int CalculateSum(int n1, int n2, int n3)
{
    return(n1 + n2 + n3);
}

void DisplayResults(int sum)
{
    printf("The sum is %d\n", sum);

    return;
}

int main()
{
    int n1, n2, n3;
    int sum;

    n1 = ReadNumber(1);
    n2 = ReadNumber(2);
    n3 = ReadNumber(3);

    sum = CalculateSum(n1, n2, n3);
    DisplayResults(sum);

    return(0);
}