花钱买的,很好的PAT甲级题库,有很详细的解题过程,而且,代码很简单。建议新手下载,PAT甲级题库答案 1001.A+BFormat(20)[字符串串处理理] Calculatea+bandoutputthesuminstandardformat—thatis,thedigitsmustbeseparatedintogroups ofthreebycommas(unlesstherearelessthanfourdigits). Input Eachinputfilecontainsonetestcas