总显示这个错误，在百度和stackoverflow里看的问题基本上都是出在链接器没有使用console,但是我建立的确实是一个控制台类应用，使用的也是console，我另外建了一个小程序，运行之后也是显示这个错误，似乎我的VS2015某处设置出了问题。我想知道问题出在了哪里，该怎么解决？
源码如下：//采用算符优先算法解决该问题

#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#include<assert.h>
#define TRUE 1
#define FALSE 0
/*创建两个堆栈，一个用于存储运算数，另一个用于存储运算符
创建用于存储运算数的结构体*/
typedef struct OPNUM
{
    double opnum;
    struct OPNUM* next;
} Opnum;
/*创建用于存储运算符的结构体*/
typedef struct OPCHAR
{
    char opchar;
    struct OPCHAR*next;
}Opchar;
Opnum* numt = NULL;
Opchar* chart = NULL;


//操作数压入函数
void pushn(double num)
{
    Opnum*new_opnum;
    new_opnum = malloc(sizeof(Opnum));
    assert(new_opnum != NULL);
    new_opnum->opnum = num;
    new_opnum->next = numt;
    numt = new_opnum;
}
//操作符压入函数
void pushc(char opchar)
{
    Opchar*new_opchar;
    new_opchar = malloc(sizeof(Opchar));
    assert(new_opchar != NULL);
    new_opchar->opchar = opchar;
    new_opchar->next = chart;
    chart = new_opchar;
}
//操作数弹出函数
double popn(void)
{
    double saven = numt->opnum;
    Opnum*stack;
    stack = numt;
    numt = numt->next;
    free(stack);
    return saven;
}
//操作符弹出函数
char popc(void)
{
    char savec = chart->opchar;
    Opchar*stack;
    stack = chart;
    chart = chart->next;
    free(stack);
    return savec;
}
//运算模块函数
double operat(double numa, char opchar, double numb)
{
    switch (opchar)
    {
    case'+':return numa + numb;
    case'-':return numa - numb;
    case'*':return numa*numb;
    case'/':return numa / numb;
    }
}
//运算符比较模块函数，opchar1为栈顶元素，opchar2将被判断是否入栈，
char compare(char opchar1, char opchar2)
{
    char Prior[7][7] =
    { // 运算符优先级表，
      //       '+' '-' '*' '/' '(' ')' '#'
        /*'+'*/'>','>','<','<','<','>','>',
        /*'-'*/'>','>','<','<','<','>','>',
        /*'*'*/'>','>','>','>','<','>','>',
        /*'/'*/'>','>','>','>','<','>','>',
        /*'('*/'<','<','<','<','<','=',' ',
        /*')'*/'>','>','>','>',' ','>','>',
        /*'#'*/'<','<','<','<','<',' ','='
    };
    char opchar[7] = { '+','-','*','/','(',')','#' };
    int i, x, y;
    for (i = 0; i<7; i++)
    {
        if (opchar[i] == opchar1)
            x = i;
        if (opchar[i] == opchar2)
            y = i;
    }
    return Prior[x][y];
}
//判断一个输入的字符究竟是运算数还是运算符
int isnum(char* input)
{
    if (input > '0'&&input < '9')
        return TRUE;
    return FALSE;
}
//算符优先法模块
double operator_precedence_method(char* input_string)
{
    char *current = input_string;
    char **currentp;
    double num;
    double result;
    chart = malloc(sizeof(Opchar));
    assert(chart != NULL);
    chart->opchar = '#';
    while (*current != '\n')
    {
        if (isnum(current))
        {
            num = strtod(current, currentp);
            current = *currentp;
            pushn(num);
        }
        else
        {
            if (compare(chart->opchar, *current) == '<')
            {
                pushc(*current);
                current++;
            }
            if (compare(chart->opchar, *current) == '>')
            {
                result = operat(popn(), popc(), popn());
                pushn(result);
                pushc(*current);
                current++;
            }
            if (compare(chart->opchar, *current) == '=')
            {
                popc();
                popc();
            }
            if (compare(chart->opchar, *current) == ' ')
            {
                printf("error!");
                return EXIT_FAILURE;
            }
        }
    }
    return result;
}
//主函数
int main(void)
{
    int result;
    char string[256];
    printf("请输入表达式:");
    fgets(string, 256, stdin);
    result = operator_precedence_method(string);
    printf("结果为%d", result);
    getch();
    return EXIT_SUCCESS;
}

已经发了，希望可以帮我解决一下，谢谢

没有，因为我发现以前写过的运行良好的程序现在也没办法运行了。。。

控制台类程序主函数肯定是叫main吧