#include"stdio.h"
#include"stdlib.h"
#include"string.h"
int main(int argc,char *argv[])
{
        char buf[128];
        FILE *fp;
        int line=0;
        if(argc < 2)
        {
                perror("must have one  argument\n");
                exit(1);
        }
        if((fp=fopen(argv[1],"r+"))==NULL)
        {
                printf("the file is not exit:%s\n",argv[0]);
                exit(1);
        }
        while(1)
        {
                if((fgets(buf,128,fp))!=NULL)
                {
                        if(buf[strlen(buf)-1]=='\n')
                        {
                                line++;
                        }
                }
                if((fgets(buf,128,fp))==NULL)
                {
                        break;
                }
        }
        printf("the file is %d\n",line);
        return 0;
}
编译后运行一个里面只有4行的文件，结果显示只有2行，不懂，求问哪里出错，各位

while(1)
        {
                if((fgets(buf,128,fp))!=NULL)
                {
                        if(buf[strlen(buf)-1]=='\n')
                        {
                                line++;
                        }
                }
                if((fgets(buf,128,fp))==NULL)      //这里又进行读取了，可以改为else break;
                {
                        break;
                }
        }

是啊，没注意到这个问题，非常感谢