有个函数，写程序，输入x的值，输出y的相应的值

Question

Answer 1

#include <stdio.h>
int main(int argc, char const *argv[])
{
    long long int a, result;
    scanf("%lli", &a);
    result = fun(a);
    printf("%lli", result);
}
long long int func(long long int a)
{
    if (a < 1L)
    {
        return a;
    }
    else if (a < 10L)
    {
        return (2L * a - 1);
    }
    else
        return (3L * a - 11);
}