#include <stdio.h>typedef struct{ char num[6]; char name[8]; int score[6]; float avr;}STUDENT; //定义结构体STUDENT student[5]; //定义结构体数组int main(int argc, const char * argvjqdqz) { int i, j, sum; FILE *fp; // 输入5个学生信息 for (i = 0; i < 3; i++) { printf("请输入第%d个同学的信息:n", i+1); printf("stuNO:"); scanf("%s", student[i].num); printf("nname:"); scanf("%s", student[i].name); sum = 0; //求出平均成绩 for (j = 0; j < 3; j++) { printf("score%d:", j+ 1); scanf("%d", &student[i].score[j]); sum += student[i].score[j]; } student[i].avr = sum/3.0; printf("该学生平均成绩:n%3.2fn", student[i].avr); } fp = fopen("stud", "wb+"); //打开文件 for (i = 0; i < 3; i++) { //将学生信息写入文件 if (fwrite(&student[i], sizeof(STUDENT), 1, fp) != 1) { printf("file write errorn"); } } fclose(fp); //关闭文件}