C中的scanf fscanf sscanf

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//----------------------------------------------------

//AUTHOR: lanyang123456

//DATE: 2014-11-09

//---------------------------------------------------

       #include <stdio.h>       int scanf(const char *format, ...);       int fscanf(FILE *stream, const char *format, ...);       int sscanf(const char *str, const char *format, ...);

scanf 从标准输入流stdin中读取输入；fscanf从stream输入流中读取输入；sscanf从字符串str中读取输入；

按照format给出的格式进行匹配和赋值。

返回值：返回成功匹配和赋值的个数；或者返回EOF，如果到达输入末端或发生读错误；

代码实例：

#include <stdio.h>int main(){int number;const char *str = "China has 56 ethnic groups.";//sscanf(str, "has %d", &number);//sscanf(str, "has %d ", &number);sscanf(str, "China has %d ", &number);printf("the number of ethnic groups = %d\n", number);}

$ gcc -o str5 str5.c
$ ./str5
the number of ethnic groups = 134513851
$ gcc -o str5 str5.c
$ ./str5
the number of ethnic groups = 134513851
$ gcc -o str5 str5.c
$ ./str5
the number of ethnic groups = 56

参考man page

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