第4章鍵盤輸入和屏幕輸出

1、2/363/36第第4章章 鍵盤輸入和屏幕輸出鍵盤輸入和屏幕輸出4.1 單個(gè)字符的輸入單個(gè)字符的輸入/輸出輸出4.2 數(shù)據(jù)的格式化屏幕輸出數(shù)據(jù)的格式化屏幕輸出4.3 數(shù)據(jù)的格式化鍵盤輸入數(shù)據(jù)的格式化鍵盤輸入4/365/366/367/368/369/3610/3611/36Press a key and then press Enter: B b ch = ch - (a A); What does this statement mean?12/36第第4章章 鍵盤輸入和屏幕輸出鍵盤輸入和屏幕輸出4.1 單個(gè)字符的輸入單個(gè)字符的輸入/輸出輸出4.2 數(shù)據(jù)的格式化屏幕輸出數(shù)據(jù)的格式化屏幕輸出4.

2、3 數(shù)據(jù)的格式化鍵盤輸入數(shù)據(jù)的格式化鍵盤輸入13/3614/3615/36printf(a=%d b=%f, a, b); 函數(shù)名函數(shù)名可選輸可選輸出列表出列表普通普通字符字符格式格式說明說明16/3617/36Input r: 5.3 printf WITHOUT width or precision specifications:circumference = 33.300854, area = 88.247263printf WITH width and precision specifications:circumference = 33.30, area = 88.25#includ

3、e main() const double pi = 3.14159; double r, circum, area; printf(Input r:); scanf(%lf, &r); circum = 2 * pi * r; area = pi * r * r; printf(printf WITHOUT width or precision specifications:n); printf(circumference = %f, area = %fn, circum, area); printf(printf WITH width and precision specification

4、s:n); printf(circumference = %7.2f, area = %7.2fn, circum, area);18/36第第4章章 鍵盤輸入和屏幕輸出鍵盤輸入和屏幕輸出4.1 單個(gè)字符的輸入單個(gè)字符的輸入/輸出輸出4.2 數(shù)據(jù)的格式化屏幕輸出數(shù)據(jù)的格式化屏幕輸出4.3 數(shù)據(jù)的格式化鍵盤輸入數(shù)據(jù)的格式化鍵盤輸入19/3620/3621/36 格式字符格式字符指定輸入數(shù)指定輸入數(shù)據(jù)格式據(jù)格式輸入數(shù)據(jù)輸入數(shù)據(jù)地址列表地址列表非格式字符非格式字符輸入數(shù)據(jù)以輸入數(shù)據(jù)以,分隔分隔沒有時(shí)可以沒有時(shí)可以空格空格、Tab或或回車回車分隔分隔22/3623/3624/36Please input a and b:a=12, b=56, a+b = 68123456 25/3626/36 27/3628/3629/3630/36%*c31/36%*2d32/3633/3634/36 a, b35/