C語言prntf和scanf函數

C語言printf和scanf函數詳細用法Printf和Scan函數的使用方法C語言printf和scanf函數詳細用法Printf和Scan函數的使用方法一,,,,printf()函數是格式化輸出函數,,,,,一般用于向標準輸出設備按規(guī)定格式輸出,,,,信息。在編寫程序時經常會用到此函數。printf()函數的調用格式為:,,,,?,,,,??,,,,?printf("",,,,,);,,,,?,,,,?,,,,其中格式化字符串包括兩部分內容:,,,,一部分是正常字符,??這些字符將按原,,,,樣輸出;,,,,另一部分是格式化規(guī)定字符,,,,,以"%"開始,,,,,后跟一個或幾個規(guī)定字符,,,,,用來確定輸出內容格式。,,,,?,,,,?,,,,參量表是需要輸出的一系列參數,,,,,其個數必須與格式化字符串所說明的輸出,,,,參數個數一樣多,,,,,各參數之間用","分開,,,,,且順序一一對應,??否則將會出現意想,,,,不到的錯誤。,,,,?,,,,?,,,,格式化字符串的格式是：?,,,,??,,,,?%[標志][輸出最小寬度][.精度][長度]格式字符1.?,,,,?標志：標志字符為-、+、#、空格四種，其意義下表所示：?,,,,???標志?,,,,??,,,,??,,,,??,,,,??,,,,?意義?,,,,???-?,,,,??,,,,??,,,,??,,,,??,,,,???結果左對齊，右邊填空格?,,,,???+?,,,,??,,,,??,,,,??,,,,??,,,,???輸出符號(正號或負號)?,,,,???空格?,,,,??,,,,??,,,,??,,,,???輸出值為正時冠以空格，為負時冠以負號?,,,,???#?,,,,??,,,,??,,,,??,,,,??,,,,???對c,s,d,u類無影響；對o類,在輸出時加前綴o；對x類,在輸出時加前綴0x；對e,g,f,,,,類當結果有小數?,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,?時才給出小數點(？？？？？？)例1：＃i,,,,ncludemain(){int,,,,a=100;float,,,,b=123.255;printf("a=%d,,,,",a);printf("a=%10d,,,,",a);printf("a=%-10d,,,,",a);printf("a=%+d,,,,",a);printf("a=%,,,,d,,,,",a);printf("a=%#o,,,,",a);printf("a=%#x,,,,",a);printf("b=%#f,,,,",b);},,,,運行結果a=100a=?,,,,??,,,,?,,,,100a=100a=+100a=,,,,100a=0144a=0x64b=123.254997??(？？？？？)2.輸出最小寬度:用十進制整數來表示輸出的最少位數。(至少要輸出這么多位！)?,,,,??,,,,??,,,,??,,,,??,,,,?若實際位數多于定義的寬度：則按實際位數輸出。?,,,,??,,,,??,,,,??,,,,??,,,,?若實際位數少于定義的寬度：則右對齊，左邊留空。?,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,???有負號，左對齊，右邊留空?,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,??,,,,???表示寬度的數字以0開始，則右對齊，左邊留空。例2,,,,＃i,,,,ncludemain(){int,,,,a=3456;printf("a=%3d,,,,",a);?,,,,?,,,,//若實際位數多于定義的寬度：則按實際位數輸出printf("a=%10d,,,,",a);?,,,,?//若實際位數少于定義的寬度：則右對齊，左邊留空printf("a=%-10d,,,,",a);??//若實際位數少于定義的寬度：有負號，左對齊，右邊留空printf("a=%010d,,,,",a);??//若實際位數少于定義的寬度：表示寬度的數字以0開始，則右對齊，左邊留空printf("a=%-010d,,,,",a);,,,,//左對齊，0無意義。},,,,運行結果：a=3456a=?,,,,??,,,,?3456a=3456a=0000003456

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