求助高手think in c++ 中程序的问题

#include <stdlib.h>
#include <assert.h>
#include "Nest.h"
#include <stdio.h>
#include <string.h>

void main(int argc,char** argv)
{
    stack textlines;
    FILE* file;
    char* s;
    #define BUFSIZE 100   
    char buf[BUFSIZE];
    assert(argc==2);
    textlines.initialize();
    file=fopen(argv[1],"r");
    assert(file);
    while(fgets(buf,BUFSIZE,file))
    {
        char* string=(char*)malloc(strlen(buf)+1);
        assert(string);
        strcpy(string,buf);
        textlines.push(string);
    }

    while((s=(char*)textlines.pop())!=0)
    {
        printf("%s",s);free(s);
    }
    textlines.cleanup();
}

运行后出现fatal error  ,说    assert(argc==2);有错误