#include<stdio.h> void Swap(int *x,int *y); int main(void){ float a,b; scanf("%d,%d",&a,&b);/*输入a和b的值*/ printf("Before swap:a=%d,b=%d\n",a,b);/*打印交换前a,b的值*/ Swap(int&a,int&b); /*调用函数Swap实现a值与b值得交换*/ printf("After swap:a=%d,b=%d\n",a,b);/*打印交换后的a,b*/ } /*函数功能:交换两个整型数的值*/ void Swap(int *x,int *y); { int temp; temp = *x; *x = *y; *y = temp; }改错
时间: 2023-08-07 20:07:46 浏览: 87
有几个错误:
1. 在输入时,应使用"%f"格式化符号而不是"%d",因为a和b是float类型的。
2. 在调用Swap函数时,应传入a和b的地址,而不是使用错误的语法“Swap(int&a,int&b)”。
3. 在定义Swap函数时,应该保留参数名称,而不是使用分号结束函数定义。
下面是修改后的代码:
```
#include <stdio.h>
void Swap(float *x, float *y);
int main(void) {
float a, b;
scanf("%f,%f", &a, &b); // 修正输入格式
printf("Before swap: a=%f, b=%f\n", a, b);
Swap(&a, &b); // 传入a和b的地址
printf("After swap: a=%f, b=%f\n", a, b);
return 0;
}
void Swap(float *x, float *y) { // 保留参数名称
float temp; // 使用float类型
temp = *x;
*x = *y;
*y = temp;
}
```
相关问题
测验题目:错题修改 #include<stdio.h> void Swap(int *x,int *y); int main(void){ float a,b; scanf("%d,%d",&a,&b);/*输入a和b的值*/ printf("Before swap:a=%d,b=%d\n",a,b);/*打印交换前a,b的值*/ Swap(a,b); /*调用函数Swap实现a值与b值得交换*/ printf("After swap:a=%d,b=%d\n",a,b);/*打印交换后的a,b*/ } /*函数功能:交换两个整型数的值*/ void Swap(int *x,int *y); { int temp; temp = *x; *x = *y; *y = temp; }
这段代码有几个问题:
1. 在`scanf`函数中,输入的是浮点数,但是使用了`%d`作为格式化字符串,应该改为`%f`。
2. 在`Swap`函数的定义中,函数名后面有一个分号,这是无效的语法,应该去掉。
3. 在`Swap`函数中,参数应该是两个指向整型数的指针,但是在`main`函数中却传入了两个浮点数,应该改为传入两个指针。
4. 在`main`函数中,调用`Swap`函数时传入的参数顺序应该是`&a`和`&b`,因为`Swap`函数中交换的是指针所指向的整型数的值。
下面是修改后的代码:
```c
#include <stdio.h>
void Swap(int *x, int *y);
int main(void) {
float a, b;
scanf("%f,%f", &a, &b); /*输入a和b的值*/
printf("Before swap: a=%f, b=%f\n", a, b); /*打印交换前a,b的值*/
Swap(&a, &b); /*调用函数Swap实现a值与b值得交换*/
printf("After swap: a=%f, b=%f\n", a, b); /*打印交换后的a,b*/
return 0;
}
/*函数功能:交换两个整型数的值*/
void Swap(int *x, int *y) {
int temp;
temp = *x;
*x = *y;
*y = temp;
}
```
#include<stdio.h> #include<stdlib.h> #include<string.h> #include<windows.h> struct stu { int id; char name[10]; float grade[11]; float sum; float average; float gpa; struct stu* next; };按照这个结构体来续写C语言代码。要求将学生信息保存在硬盘文件中,通过制定文件路径和文件名称来导入学生信息;按照学号对所有学生信息进行升序、降序排列,并输出到屏幕显示或输出到文件
好的,以下是续写的代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
struct stu {
int id;
char name[10];
float grade[11];
float sum;
float average;
float gpa;
struct stu* next;
};
void saveToFile(struct stu* head, char* fileName) {
FILE* fp = fopen(fileName, "wb");
if (fp == NULL) {
printf("Failed to open file!\n");
return;
}
struct stu* p = head;
while (p != NULL) {
fwrite(p, sizeof(struct stu), 1, fp);
p = p->next;
}
fclose(fp);
printf("Successfully saved to file!\n");
}
struct stu* readFromFile(char* fileName) {
FILE* fp = fopen(fileName, "rb");
if (fp == NULL) {
printf("Failed to open file!\n");
return NULL;
}
struct stu* head = NULL, *p = NULL, *q = NULL;
while (!feof(fp)) {
p = (struct stu*)malloc(sizeof(struct stu));
if (p == NULL) {
printf("Memory allocation failed!\n");
return NULL;
}
fread(p, sizeof(struct stu), 1, fp);
if (p->id == 0) {
free(p);
break;
}
p->next = NULL;
if (head == NULL) {
head = p;
}
else {
q->next = p;
}
q = p;
}
fclose(fp);
printf("Successfully read from file!\n");
return head;
}
void printList(struct stu* head) {
if (head == NULL) {
printf("The list is empty!\n");
return;
}
printf("ID\tName\tGrade1\tGrade2\tGrade3\tGrade4\tGrade5\tGrade6\tGrade7\tGrade8\tGrade9\tGrade10\tSum\tAverage\tGPA\n");
struct stu* p = head;
while (p != NULL) {
printf("%d\t%s\t", p->id, p->name);
for (int i = 0; i < 10; i++) {
printf("%.2f\t", p->grade[i]);
}
printf("%.2f\t%.2f\t%.2f\n", p->sum, p->average, p->gpa);
p = p->next;
}
}
void swap(struct stu* a, struct stu* b) {
struct stu temp = *a;
*a = *b;
*b = temp;
}
void sortList(struct stu* head, int order) {
if (head == NULL) {
printf("The list is empty!\n");
return;
}
int count = 0;
struct stu* p = head;
while (p != NULL) {
count++;
p = p->next;
}
for (int i = 0; i < count - 1; i++) {
p = head;
for (int j = 0; j < count - i - 1; j++) {
if (order == 1) {
if (p->id > p->next->id) {
swap(p, p->next);
}
}
else {
if (p->id < p->next->id) {
swap(p, p->next);
}
}
p = p->next;
}
}
printf("Successfully sorted!\n");
}
int main() {
struct stu* head = NULL;
char fileName[100];
int choice, order;
while (1) {
system("cls");
printf("1. Import student information from file\n");
printf("2. Save student information to file\n");
printf("3. Print student information\n");
printf("4. Sort student information by ID in ascending order\n");
printf("5. Sort student information by ID in descending order\n");
printf("6. Exit\n");
printf("Please enter your choice: ");
scanf_s("%d", &choice);
switch (choice) {
case 1:
printf("Please enter the file path and name: ");
scanf_s("%s", fileName, 100);
head = readFromFile(fileName);
Sleep(2000);
break;
case 2:
printf("Please enter the file path and name: ");
scanf_s("%s", fileName, 100);
saveToFile(head, fileName);
Sleep(2000);
break;
case 3:
printList(head);
system("pause");
break;
case 4:
sortList(head, 1);
system("pause");
break;
case 5:
sortList(head, 2);
system("pause");
break;
case 6:
printf("Goodbye!\n");
return 0;
default:
printf("Invalid choice!\n");
Sleep(1000);
break;
}
}
return 0;
}
```
这段代码实现了以下功能:
1. 将学生信息保存到硬盘文件中,并通过指定文件路径和文件名称来导入学生信息。
2. 按照学号对所有学生信息进行升序、降序排列,并输出到屏幕显示或输出到文件。
3. 通过菜单的方式来选择要执行的操作。
希望对你有所帮助!
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