該代碼目前像一個魅力。但是,最後兩行輸出是相同的,你可以在這裏看到。C編程在編譯器中顯示txt文件
這裏有什麼問題?
數據來自之前構建的txt文件。
1 CADBURY 999 1.900000
2 PEPSI 999 2.500000
3 IPHONE 976 2500.000000
4 SPIRULINA 100 50.000000
2 PAIPSI 100 0.900000
10 BLACKMORE 98 30.000000
17 TROPICANA 13 1.500000
17 TROPICANA 13 1.500000
下面的代碼:
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <ctype.h>
int addProduct();
struct product {
int quantity, reorder, i, id;
char name[20];
float price;
};
int main() {
FILE *fp;
int i = 0;
struct product a;
system("cls");
char checker;
int counter;
do {
fp = fopen("addproduct.txt", "a+t");
system("cls");
printf("Enter product ID : ");
scanf(" %d", &a.id);
printf("Enter product name : ");
scanf(" %s", a.name);
printf("Enter product quantity : ");
scanf(" %d", &a.quantity);
printf("Enter product price : ");
scanf(" %f", &a.price);
fprintf(fp, "%d %s %d %f\n\n", a.id, a.name, a.quantity, a.price);
printf("Record saved!\n\n");
fclose(fp);
printf("Do you want to enter new product? Y/N : ");
scanf(" %c", &checker);
checker = toupper(checker);
i++;
system("cls");
} while(checker == 'Y');
if (checker == 'N') {
fp = fopen("addproduct.txt", "r");
while (!feof(fp)) {
fscanf(fp, "%d %s %d %f", &a.id, a.name, &a.quantity, &a.price);
printf("%d %s %d %f\n\n", a.id, a.name, a.quantity, a.price);
}
fclose(fp);
}
return(0);
}
抱歉提問。所以,4是一個隨機數,或者我需要爲它設置一個計數器? –
'4'是'fscanf()':'%d','%s','%d'和'%f'成功執行的轉換次數。 – chqrlie
謝謝你,你搖滾!上帝保佑 :) –