从字符串格式化输入数据：sscanf

代码—1：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>int main()
{int day, year;char weekday[20], month[20], dtm[100];strcpy( dtm, "Saturday March 25 1989" );sscanf( dtm, "%s %s %d %d", weekday, month, &day, &year );printf("%s %d, %d = %s\n", month, day, year, weekday );strcpy( dtm, "hello_1" );sscanf( dtm, "%s_%d", weekday, &day);day++;printf("%s %d\n", weekday, day);
 return(0);
}

执行如下：

March 25, 1989 = Saturday hello_1 26

代码—2：
※使用正则表达式

#include <stdio.h>
#include <stdlib.h>
#include <string.h>int main()
{int day, year;char weekday[20], month[20], dtm[100];strcpy( dtm, "Saturday March 25 1989" );sscanf( dtm, "%s %s %d %d", weekday, month, &day, &year );printf("%s %d, %d = %s\n", month, day, year, weekday );strcpy( dtm, "hello_1" );sscanf( dtm, "%[a-zA-Z]_%d", weekday, &day);day++;printf("%s %d\n", weekday, day);
 return(0);
}

执行如下：

March 25, 1989 = Saturday hello 2