c语言如何读取txt文件内容？

#include <stdio.h>
#include <stdlib.h>
#include  <assert.h>
typedef struct student{
        char name[32];
        int  no;
        char sex[16];
        float score;
} stu;
 
int main(int argc, char* argv[])
{
    //打开文件 
    FILE * r=fopen("A.txt","r");
    assert(r!=NULL);
    FILE * w=fopen("B.txt","w");
    assert(w!=NULL);
     
    //读写文件 
    stu a[128];
    int i=0;
    while(fscanf(r,"%s%d%s%f",a[i].name,&a[i].no,a[i].sex,&a[i].score)!=EOF)
    {
         printf("%s\t%d\t%s\t%g\n",a[i].name,a[i].no,a[i].sex,a[i].score);//输出到显示器屏幕 
         fprintf(w,"%s\t%d\t%s\t%g\n",a[i].name,a[i].no,a[i].sex,a[i].score);//输出到文件B.txt 
         i++;
    }  
     
    //关闭文件 
    fclose(r);
    fclose(w);
     
    system("pause");
    return 0;
}