#include <stdlib.h>#include <stdio.h>#define MAX_LEN 512int main(){    int age;    int totalAge;    float avgAge;    int peopleNum;    FILE *file;    char info[MAX_LEN];    char *infoPtr;    file = fopen("D:/family.txt", "r");    //按行读取文件    while(fgets(info, MAX_LEN, file)){        infoPtr = info;        peopleNum = 0;        totalAge = 0;        //strtol转换字符到数字        while((age = strtol(infoPtr, &infoPtr, 10)) > 0){            totalAge += age;            peopleNum++;        }        //类型转换为float,然后计算平均年龄        avgAge = (float)totalAge / peopleNum;        printf("%savg: %5.2f\n", info, avgAge);    }    return 0;}

#include <stdlib.h>#include <stdio.h>#include <time.h>//比较元素int compare(void const *birth1, void const *birth2){    return *(int  *)(birth1) - *(int*)(birth2);}//打印数组void print_arr(int *array, int len){    int idx = 0;    while(idx <= len){        printf("%d ", array[idx]);        idx++;    }}//数组中是否有两个相同数int count_same(int *array, int len){    int same = 0;    while(len > 0){        if(array[len] == array[len - 1]){            return 1;        }        len--;    }    return 0;}int main(){    int times = 0;    int randBirthday[30];    int peopleCount;    int sameCount = 0;    srand((unsigned int)time(0));    while(times < 100000){        peopleCount = 29;        while(peopleCount >= 0){            randBirthday[peopleCount] = rand() % 365;            peopleCount--;        }        qsort(randBirthday, 30, sizeof(int), compare);        sameCount += count_same(randBirthday, 29);        times++;    }    printf("%f", (float)(sameCount) / 100000);    return 0;}