从键盘上输入若干个同学的成绩,直到-1为止,求平均成绩,用for语句
http://zhidao.baidu.com/question/689235405091109484.html?fr=iks&word=%D4%DA%BC%FC%C5%CC%D6%D0%CA%E4%C8%EB8%CE%BB%CD%AC%D1%A7%B5%C4%B3%C9%BC%A8%2C%CD%A8%B9%FDfor%B7%BD%B7%A8%BD%F8%D0%D0%CA%E4%C8%EB%CF%D4%CA%BE%B2%A2%C7%F3%C6%BD%BE%F9%D6%B5&ie=gbk ——百度知道
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答:double sum=0,avg ;for ( i=0;;i++ ) //循环退出条件这里不写 { scanf("%d", &score );if ( score == -1 ) //输入为-1