识别错误造成的分割故障(核心倾倒)

我是新来的c节目。 决定我会学会做的一些问题集中的计算机科学50开放式课件。 以下代码产生了分割的故障(核心倾销)的错误。 我不明白为什么。 我读过一个分割的错误做访问记忆你没有访问。 我看不到会是什么引起的。 我假设它的指针。 我是新来的指针。 谢谢你。

    #include <stdio.h>

// https://cs50.harvard.edu/x/2021/labs/1/population/

float yearly_llamas(float starting_population) {
    // returns number of llamas at the end of the year
    float born = starting_population / 3;
    float died = starting_population / 4;
    float end_of_year_pop = starting_population + born - died;

    return end_of_year_pop;
}

int main(void) {
    
    // use floats for precision
    float *start_population;
    float *end_population;

    // set start lower limit
    int start_min = 9;

    
    // make sure input for starting population is greater than or equal to 9
    do {
        printf("Starting population: ");
        scanf("%f", start_population);
    } while (*start_population < start_min);
    
 

    // get ending population, make sure greater than or equal to the starting population
    do {
        printf("Ending population: ");
        scanf("%f", end_population);
    } while (*end_population < *start_population);

    // print for verification
    printf("%f\n", *start_population);
    printf("%f\n", *end_population);

    float end_pop = yearly_llamas(*start_population);

    printf("Llamas at the end of the year: %f\n", end_pop);


  return 0;
}