C语言continue和break有的区别


continue语句用来返回循环的起始处，而break语句用来退出循环。例如，下例中就有一条典型的continue语句：

    while(!feof(infile))

    {

       fread(inbuffer，80，1，infile)；／*read in a line from input file*／

       if(!strncmpi(inbuffer，"REM"，3))  ／*check if it is

                                             a comment line*／

       continue；    ／*it's a comment，so jump back to the while()*／

       else

      parse_line()；    ／*not a comment—parse this line*／

    }

上例读入一个文件并对其进行分析。“REM(remark的缩写)”用来标识正在被处理的文件中的一个注释行。因为注释行对程序不起任何作用，所以可以跳过它。在读入输入文件的每一行时，上例就把该行的前三个字母与"REM"进行比较。如果匹配，则该行就是注释行，于是就用continue语句返回到while语句，继续读入输入文件的下一行；否则，该行就是一条有效语句，于是就调用parse_line()函数对其进行分析。

break语句用来退出循环。下面是一个使用break语句的例子：

while (! feof(infile))

     fread(inbuffer,80,1,infile) ;/* read in a line from input file * /

     if (! strncmpi (inbuffer,"REM",3))  / * check if it is

                                                           a comment line * /

           continue;       /* it's a comment, so jump back to the while() * /

     else

     {

           if (parse_line()==FATAL_ERROR)   / * attempt to parse

                                                                    this line * /

              break;                 /* fatal error occurred,so exit the loop * /

     }

    这个例子建立在使用continue语句的那个例子的基础上。注意，在这个例子中，要检查parse_line()函数的返回值。如果parse_line()的返回值为FATAL_ERROR，就通过break语句立即退出while循环，并将控制权交给循环后面的第一条语句

。
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