用C语言编程：输出1000以内的所有素数，并统计个数．

写个主要步骤 FOR j=2 TO 1000 x = 0: k = 2 DO WHILE k 〈= SQR(j) AND x = 0 IF j MOD k = 0 THEN x = 1 k = k + 1 LOOP IF x = 0 THEN y = y + 1: PRINT j; NEXT j PRINT y END