C语言vs2019重新生成解决方案之后运行程序显示系统找不到指定文件，为什么？

函数部分：
#include"head.h"
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

//结点数
int n;

//界面
void Interface()
{
printf("\n\n\n\n\t\t\t\t\t\t\t\t个人通讯录管理系统\n\n\n\n");
printf("\t\t\t\t\t\t\t\t 1.添加\n");
printf("\t\t\t\t\t\t\t\t 2.显示\n");
printf("\t\t\t\t\t\t\t\t 3.修改\n");
printf("\t\t\t\t\t\t\t\t 4.删除\n");
printf("\t\t\t\t\t\t\t\t 5.查找\n");
}

//建立动态链表存通讯录数据
struct Communication* creat(void)
{
struct Communication* head;
struct Communication* p1, * p2;
n = 0;
p1 = p2 = (struct Communication *)malloc(LEN);
printf("请输入人员信息\n");
printf("请输入姓名：");
scanf("%s", p1->name);
printf("%s", p1->name);

printf("请输入地址：");
scanf("%s", p1->address);
printf("请输入电话号码：");
scanf("%s", p1->num);
head = NULL;
while (p1->name[0]!='0')
{
    n = n + 1;
    if (n == 1)
    {
        head = p1;
    }
    else
    {
        p2->next = p1;
    }
    p2 = p1;
    p1 = (struct Communication*)malloc(LEN);
    printf("请输入姓名：");
    scanf("%s", p1->name);
    printf("请输入地址：");
    scanf("%s", p1->address);
    printf("请输入电话号码：");
    scanf("%s", p1->num);
}
p2->next = NULL;
return(head);

}

//输出
void print(struct Communication* head)
{
struct Communication* p;
p = head;
if (head != NULL)
{
while (p != NULL)
{
printf("%d", n);
puts(p->name);
printf("\n");
puts(p->address);
printf("\n");
puts(p->num);
printf("\n");
p = p->next;
}
}
}
主函数部分：
#include<stdio.h>
#include"head.h"
#include<stdlib.h>
#include<string.h>

//建立动态链表存通讯录数据
struct Communication* creat(void);
//输出
void print(struct Communication* head);
//界面
void Interface();

int main()
{
struct Communication* pt;
Interface();
pt = creat();
print(pt);
return 0;
}

有error错误呢，编译都没通过，怎么会有exe文件生成呢，自然会提示没有exe文件来执行了

提示你有错误啊，根据提示修改代码，重新编译就是了

#pragma once
#define LEN sizeof(struct Communication)

//结点数
extern int n;

struct Communication
{
char name[10] ;
char address[20];
char num[11];
struct Communication* next;
};

修改完善如下，缺了结构体的定义，其他见注释，供参考：

//#include"head.h"
//#include<stdio.h>
//#include<stdlib.h>
//#include<string.h>


//主函数部分：
#include<stdio.h>
//#include"head.h"
#include<stdlib.h>
#include<string.h>

struct Communication{
       char name[16];
       char address[64];
       char num[12];
       struct Communication *next;
};


int n=0; //结点数
int LEN = sizeof(struct Communication);

struct Communication* creat(void);//建立动态链表存通讯录数据

void print(struct Communication* head);//输出

void Interface();//界面

int main()
{
    struct Communication* pt;
    Interface();
    pt = creat();
    print(pt);
    
    return 0;
}



//界面
void Interface()
{
    printf("\n\n\n\n\t\t\t\t\t\t个人通讯录管理系统\n\n\n\n");
    printf("\t\t\t\t\t\t 1.添加\n");
    printf("\t\t\t\t\t\t 2.显示\n");
    printf("\t\t\t\t\t\t 3.修改\n");
    printf("\t\t\t\t\t\t 4.删除\n");
    printf("\t\t\t\t\t\t 5.查找\n");
}

//建立动态链表存通讯录数据
struct Communication* creat(void)
{
    struct Communication* head;
    struct Communication* p1, * p2;
                                //n = 0;
                                //p1 = p2 = (struct Communication *)malloc(LEN);
                                //printf("请输入人员信息\n");
                                //printf("请输入姓名：");
                                //scanf("%s", p1->name);
                                //printf("%s", p1->name);
                                //printf("请输入地址：");
                                //scanf("%s", p1->address);
                                //printf("请输入电话号码：");
                                //scanf("%s", p1->num);
    head = NULL;
    while (1)
    {

        p1 = (struct Communication*)malloc(LEN);
        printf("请输入姓名：");
        scanf("%s", p1->name);
        if(strcmp(p1->name,"0")==0) break; //输入“0”,结束输入
        printf("请输入地址：");
        scanf("%s", p1->address);
        printf("请输入电话号码：");
        scanf("%s", p1->num);
        n = n + 1;
        if (n == 1)
        {
            head = p1;
        }
        else
        {
            p2->next = p1;
        }
        p2 = p1;

    }
    free(p1);
    return(head);
}

//输出
void print(struct Communication* head)
{
    struct Communication* p;
    p = head;
                        //if (head != NULL)
                        //{
        while (p != NULL)
        {
             printf("%d\n", n);
             puts(p->name);
                        //printf("\n");
             puts(p->address);
                         //printf("\n");
             puts(p->num);
             printf("\n");
             p = p->next;
        }
                          //}
}