结构和功能很奇怪，如何解决？

Question

当我尝试编译它时它起作用但是我第一次注册汽车它会跳过“进入模型”然后如果我选择继续并注册一辆新车它就可以了。我不知道为什么会这样或者是什么原因。如果我没有菜单（循环）运行它工作正常。请帮忙！

#include <stdio.h> 
#include <string.h> 
#include <stdlib.h> 
#define WORDLENGTH 30
#define MAX 100

struct car{
    char model[WORDLENGTH]; 
    int year;
    int milage;
};
typedef struct car Car;

Car createCar(char model[],int year, int milage){ 
    Car c;
    strcpy(c.model,model); 
    c.year=year; 
    c.milage=milage; 
    return c;
}
//REGISTER THE CARS FUNCTION
void regCars(Car reg[],int *pNrOfCars){
    char again[WORDLENGTH] = "ja", model[WORDLENGTH], tmp[WORDLENGTH]; 
    int year,milage;
    while(strcmp(again,"ja")==0){

        printf("Enter model:");
        gets(model);

        printf("Enter year:");
        gets(tmp); 
        year=atoi(tmp);

        printf("Enter milage:");
        gets(tmp);
        milage=atoi(tmp); 

        reg[*pNrOfCars]=createCar(model,year,milage); (*pNrOfCars)++;

        printf("Continue? (ja/nej)");
        gets(again);
    }
}
int main(){
    Car carRegister[MAX];
    int nrOfCars=0;

    //HERE IS THE MENU:::::::::

    char choice;
    printf("\nMeny\n1 register\n2 exit\n");
    scanf(" %c", &choice);
    int run=1;
    while(run){
        if(choice=='1') regCars(carRegister,&nrOfCars); 
        if(choice=='2') run=0;
    }
    return 0;
 }