函数入门需要帮助输入数字（初学者）

Question

[我想知道如何使用带有下面编写代码的函数来输入数字，而对于如何输入并给出输出我还是有点困惑，基本上我只是从函数级别0开始。

int addTwoInt(int a, int b);

int main(void)
{
    printf("Enter a number: ");
    scanf("%d", &addTwoInt(<#int a#>, <#int b#>));
    // printf("The two numbers added are %d", addTwoInt);
}

int addTwoInt(int a, int b)
{
    int sum;
    sum = a + b;
    return sum;
    printf("The sum of the numbers are %d", sum);
}

Answer 1

int addTwoInt(int a, int b);
int main(void)
{
int x;
int y;
printf("Enter a number: ");
scanf("%d", &x);
scanf("%d", &y);

int z = addTwoInt(x, y);
printf("%d", z);

//printf("The two numbers added are %d", addTwoInt);
}

int addTwoInt(int a, int b)
{
int sum;
sum = a + b;
printf("The sum of the numbers are %d", sum);
return sum;
}