照着书本码字的代码，为何无法编译？
Pelles C里编译时提示下列内容：
Project build started
Project build ended in complete failure

<程序代码如下>

//使用命令行参数拷贝文件
#include <stdio.h>

int main(int argc, char *argv[])
{
    FILE *in, *out;
    int c;

    if( argc ! = 3)      //如果命令行给的参数数量不对
    {
        fprintf(stderr,"Need two files names\n");
        return 1;
    }
    if ( (in = fopen(argv[1],"r")) == NULL )
    {
        fprintf(stderr, "Can't read %s.\n", argv[1]);
        return 2;
    }
    if ( (out = fopen(argv[2], "w")) == NULL )
    {
        fprintf(stderr, "Can't write %s.\n", argv[2]);
        return 3;
    }

    while ( (c = getc(in)) != EOF )
        putc(c, out);

    printf("File has been copied.\n");
    fclose(in);
    fclose(out);

    return 0;
}

    //if( argc ! = 3)      //如果命令行给的参数数量不对
    if( argc != 3)      //如果命令行给的参数数量不对

果然如此，谢谢