C/code/学生记录.c

#include <stdio.h>
#include <string.h>

#define max 50
#define length 20

struct Student {
    int num;
    char name[length];
    int age;
};

int compareByName(const void *a, const void *b) {
    struct Student *studentA = (struct Student *)a;
    struct Student *studentB = (struct Student *)b;
    return strcmp(studentA->name, studentB->name);
}

int compareByAge(const void *a, const void *b) {
    struct Student *studentA = (struct Student *)a;
    struct Student *studentB = (struct Student *)b;
    if (studentA->age != studentB->age) {
        return studentA->age - studentB->age;
    } else {
        return strcmp(studentA->name, studentB->name);
    }
}

int main() {
    int n,i;
    scanf("%d", &n);
    
    struct Student students[max];
    
    for (i = 0; i < n; i++) {
        scanf("%d%s%d", &students[i].num, students[i].name, &students[i].age);
    }
    
    qsort(students, n, sizeof(struct Student), compareByName);
    
    for (i = 0; i < n; i++) {
        printf("%3d  %6s %3d\n", students[i].num, students[i].name, students[i].age);
    }
    
    printf("\n");
    
    qsort(students, n, sizeof(struct Student), compareByAge);
    for (i = 0; i < n; i++) {
        printf("%3d  %6s %3d\n", students[i].num, students[i].name, students[i].age);
    }
    
    return 0;
}