第一種方法：使用格式化讀寫文字檔案

#include<stdio.h>
#include<stdlib.h>

//主要功能：將特定結構寫入檔案，和檔案讀取
#define SIZE 2
//定義員工結構
struct Student
{
        char name[30];  //姓名
        char department[30]; //部門
        float base_pay;  //基本工資
        float allowance;  //月工資
        float total;
       
}*pa,*pb;


int main(){
        //結構體陣列
        int i=0;
        //檔案
		struct Student stu[SIZE];
        FILE *fp;
        pa = stu;
        pb = stu;
        fp = fopen("C:\\Users\\32239\\Desktop\\student.txt","wt+");
        if(fp==NULL){
                printf("error!\n");
                exit(0);
        }
        printf("please input name/department/base_pay/allowance:\n");
        for(i= 0; i< SIZE; i++,pa++){
                scanf("%s %s %f %f",pa->name,pa->department,&pa->base_pay,&pa->allowance);

              //將資料讀到檔案中
                pa->total = pa->base_pay + pa->allowance;
                fprintf(fp,"%s %s %f %f %f\n",pa->name,pa->department,pa->base_pay,pa->allowance,pa->total);
               
        }
        
        rewind(fp);
        for(i= 0; i< SIZE; i++,pb++){
                fscanf(fp,"%s %s %f %f %f\n",pb->name,pb->department,&pb->base_pay,&pb->allowance,&pb->total);
		        pb->base_pay += 100;
				pb->total = pb->base_pay + pb->allowance;
                printf("%s,%s ,%f ,%f ,%f\n",pb->name,pb->department,pb->base_pay,pb->allowance,pb->total);

        }

        fclose(fp);
        return 0;
        

        //將檔案資料輸出

}
 

#include<stdio.h>
#include<stdlib.h>

//主要功能：將特定結構寫入檔案，和檔案讀取
#define SIZE 2
//定義員工結構
struct Student
{
        char name[30];  //姓名
        char department[30]; //部門
        float base_pay;  //基本工資
        float allowance;  //月工資
        float total;
       
};


int main(){
        //結構體陣列
        int i=0;
        //檔案
	struct Student stu[SIZE];
        FILE *fp;

        fp = fopen("C:\\Users\\32239\\Desktop\\student.txt","wt+");
        if(fp==NULL){
                printf("error!\n");
                exit(0);
        }
        printf("please input name/department/base_pay/allowance:\n");
        for(i= 0; i< SIZE; i++){
                scanf("%s %s %f %f",stu[i].name,stu[i].department,&stu[i].base_pay,&stu[i].allowance);

              //將資料讀到檔案中
                stu[i].total = stu[i].base_pay + stu[i].allowance;
                fputs(&stu[i],fp);
                //fprintf(fp,"%s %s %f %f %f\n",stu[i].name,stu[i].department,stu[i].base_pay,stu[i].allowance,stu[i].total);
               
        }
        
        rewind(fp);
        for(i= 0; i< SIZE; i++){
                fgets(&stu[i],sizeof(Student),fp);
                //fscanf(fp,"%s %s %f %f %f\n",stu[i].name,stu[i].department,&stu[i].base_pay,&stu[i].allowance,&stu[i].total);
                stu[i].base_pay += 100;
                stu[i].total =stu[i].base_pay + stu[i].allowance;
                printf("%s,%s ,%f ,%f ,%f\n",stu[i].name,stu[i].department,stu[i].base_pay,stu[i].allowance,stu[i].total);

        }

        fclose(fp);
        return 0;
        

        //將檔案資料輸出

}
 

總結：最好使用格式化讀寫結構體資料，fgets不行，不能保證裡面沒有控制符

第二種：使用資料塊讀寫二進位制檔案，不用編碼，直接以二進位制存取，不過開啟不可讀

#include<stdio.h>
#include<stdlib.h>

//主要功能：將特定結構寫入檔案，和檔案讀取
#define SIZE 2
//定義員工結構
#define LENGHT sizeof(struct Student)
struct Student
{
        char name[30];  //姓名
        char department[30]; //部門
        float base_pay;  //基本工資
        float allowance;  //月工資
        float total;
       
};


int main(){
        //結構體陣列
        int i=0;
        //檔案
	struct Student stu[SIZE];
        FILE *fp;

        fp = fopen("C:\\Users\\32239\\Desktop\\student.txt","wb+");
        if(fp==NULL){
                printf("error!\n");
                exit(0);
        }
        printf("please input name/department/base_pay/allowance:\n");
        for(i= 0; i< SIZE; i++){
                scanf("%s %s %f %f",stu[i].name,stu[i].department,&stu[i].base_pay,&stu[i].allowance);

              //將資料讀到檔案中
                stu[i].total = stu[i].base_pay + stu[i].allowance;
                if((fwrite(&stu[i], LENGHT,1,fp)) != 1){
					exit(0);
				}
                //fprintf(fp,"%s %s %f %f %f\n",stu[i].name,stu[i].department,stu[i].base_pay,stu[i].allowance,stu[i].total);
               
        }
        
        rewind(fp);
        for(i= 0; i< SIZE; i++){
			
                fread(&stu[i],LENGHT,1,fp);
                //fscanf(fp,"%s %s %f %f %f\n",stu[i].name,stu[i].department,&stu[i].base_pay,&stu[i].allowance,&stu[i].total);
                stu[i].base_pay += 100;
                stu[i].total =stu[i].base_pay + stu[i].allowance;
				 printf("%s,%s ,%f ,%f ,%f\n",stu[i].name,stu[i].department,stu[i].base_pay,stu[i].allowance,stu[i].total);

               
        }

        fclose(fp);
        return 0;
        

        //將檔案資料輸出

}
 

結果：

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