c - C 中方法的段错误

Question

#include<stdio.h>
int calc_perc(int r){

        float A, B, C, OTHER;
        int fullSections, leftover;
        const int FULLCLASS = 25;

        fullSections = r/FULLCLASS;
        leftover = r - (FULLCLASS*fullSections);
        A = r*0.30;
        B = r*0.25;
        C = r*0.15;
        OTHER = r*0.30;

        printf("\nEnrollment: %d students\n", r);
        printf("Full sections: %d\n", fullSections);
        printf("Left over: %d students\n", leftover);

        printf("\n      Students expected to recieve an A: %0.2f ", A);
        printf("\n      Students expected to recieve a B: %0.2f ", B);
        printf("\n      Students expected to recieve a C: %0.2f ", C);
        printf("\n      Students expected to recieve some other grade: %0.2f\n\n", OTHER);

        printf("=======================================\n\n");
}

int main(void)
{

        int students1, students2, students3;

        printf("Elijah Grote\n");
        printf("\nEnter three enrollments on one line: ");
        scanf("%d %d %d", students1, students2, students3);
        calc_perc(students1);
        calc_perc(students2);
        calc_perc(students3);
        return 0;
}

我认为错误发生在 calc_perc 或 scanf 中......但我无法弄清楚是哪个错误以及为什么这样做......编译干净，但是当我输入学生 1、2 和 3 的数字时，它给了我一个段错误。我使用 Unix，当我执行 a.out 并在它要求 3 个数字后输入它时:56 ^H^H 它打印出正确的格式，但没有正确的数字......与错误的内存分配有关或坏指针？

感谢任何帮助，

谢谢

Answer 1

函数 scanf 需要每个目标变量的地址(否则它会如何设置它？)。

改变这个:

scanf("%d %d %d", students1, students2, students3);

对此:

scanf("%d %d %d", &students1, &students2, &students3);

作为旁注，您已声明函数 calc_perc 以返回 int，但它不返回任何内容。