update 2

a.txt

@@ -1 +1 @@
-114514 Cierra famale 114514 0  
+1 1 1 1 0 

main.c

@@ -7,19 +7,19 @@
 #define N 50        
 int k = 1, n = 0, m = 0;
 
-typedef struct student {
+typedef struct Bank {
 	char no[13];//卡号
 	char name[10];//姓名
 	char sex[8];//性别
 	int balance;//余额
 	char passwd[20];
-} student, stu[max];
-void fileWrite(int n, stu s);
+} bank, ban[max];
+void fileWrite(int n, ban s);
 void modify() {
 	int j = 0;
 	FILE * fp;
 	if ((fp = fopen("a.txt", "r")) == NULL) return;
-	stu s;
+	ban s;
 	while (fscanf(fp, "%s %s %s %s %d ", &s[j].no, &s[j].name, &s[j].sex[j],&s[j].passwd, &s[j].balance) == 5) {
 		j++;
 	}
@@ -80,7 +80,7 @@ void insert() {
 	scanf("%d", &n);
 	FILE * fp;
 	if ((fp = fopen("a.txt", "at")) == NULL) return;
-	stu s;
+	ban s;
 	for (i = 0; i<n; i++) {
 		printf("\n请输入第%d个用户的卡号：", i + 1);
 		scanf("\n%s", &s[i].no);
@@ -91,17 +91,18 @@ void insert() {
 		printf("\n请输入第%d 个用户的密码：", i + 1);
 		scanf("%s", &s[i].passwd);
 		//写入文件
+		fseek(fp, 0L, SEEK_END);
 		fprintf(fp, "%s %s %s %s %d \n", s[i].no, s[i].name, s[i].sex,s[i].passwd, s[i].balance = 0);
+		fclose(fp);
 	}
 	printf("添加成功!!!\n");
-	fclose(fp);
 	system("pause");
 }
 void del() {
 	int j = 0;
 	FILE * fp, *fp1;
 	if ((fp = fopen("a.txt", "r")) == NULL) return;
-	stu s;
+	ban s;
 	while (fscanf(fp, "%s %s %s %s %d ", &s[j].no, &s[j].name, &s[j].sex[j],&s[j].passwd, &s[j].balance) == 5) {
 		j++;
 	}
@@ -138,7 +139,7 @@ void seek() {
 	int j = 0,flag=0;
 	FILE * fp;
 	if ((fp = fopen("a.txt", "r")) == NULL) return;
-	stu s;
+	ban s;
 	while (fscanf(fp, "%s %s %s %s %d", &s[j].no, &s[j].name, &s[j].sex[j], &s[j].passwd, &s[j].balance) == 5) {
 		j++;
 	}
@@ -148,7 +149,7 @@ void seek() {
 	lable1:
 	printf("请输入卡号(输入0返回主菜单)：\n");
 	scanf("%s", &s1);
-	if(s1=0)
+	if (strcmp(s1, "0") == 0)
 	{
 		return;
 	}
@@ -183,18 +184,19 @@ void save()
 {
 int j = 0,flag=0;
 	FILE * fp;
-	if ((fp = fopen("a.txt", "r")) == NULL) return;
-	stu s;
+	if ((fp = fopen("a.txt", "r+")) == NULL) return;
+	ban s;
 	while (fscanf(fp, "%s %s %s %s %d", &s[j].no, &s[j].name, &s[j].sex[j], &s[j].passwd, &s[j].balance) == 5) {
 		j++;
 	}
 	n = j;
-	int i = 0, item,save;
+	struct Bank *str = s;
+	int i = 0, item,save,aftersave;
 	char s1[13], s2[20];
 	lable1:
 	printf("请输入卡号(输入0返回主菜单)：\n");
 	scanf("%s", &s1);
-	if(s1=0)
+	if (strcmp(s1, "0") == 0)
 	{
 		return;
 	}
@@ -205,9 +207,11 @@ int j = 0,flag=0;
 			if (strcmp(s[i].passwd, s2) == 0) {
 				printf("请输入您要存款的金额：");
 				scanf("%d",&save);
-				fprintf(fp, "%s %s %s %s %d \n", s[i].no, s[i].name, s[i].sex,s[i].passwd, s[i].balance = s[i].balance+save);
-				printf("存款成功!")
-				printf("当前余额为%d元",s[i].balance);
+				s[i].balance = save + s[i].balance;
+				fileWrite(n, s);
+				fclose(fp);
+				printf("存款成功!\n");
+				printf("当前余额为%d元\n",s[i].balance);
 				flag = 2;
 				break;
 			}
@@ -221,11 +225,11 @@ int j = 0,flag=0;
 		printf("您输入的用户名不存在，请重新输入\n");
 		goto lable1;
 	}
-	fclose(fp);
+
 
 	system("pause");
 }
-	void fileWrite(int n, stu s) {
+	void fileWrite(int n, ban s) {
 	FILE *fp1;
 	int i;
 	if ((fp1 = fopen("a.txt", "w")) == NULL) return;
@@ -233,7 +237,6 @@ int j = 0,flag=0;
 		fprintf(fp1, "%s %s %s %s %d  ", s[i].no, s[i].name, s[i].sex,s[i].passwd, s[i].balance);
 	}
 	fclose(fp1);
-	printf("保存成功!!!\n");
 }
 /* 界面*/
 void menu() {
@@ -261,6 +264,7 @@ void menu() {
 		seek();
 		break;
 	case 2:
+		save();
 		break;
 	case 3:
 		break;