sscanf的用法

sscanf也太好用了8我竟然一直都不知道qaq

 #include<cstdio>
 #include<cstdlib>
 #include<cstring>
 #include<iostream>
 using namespace std;

 const int N=;
 char s[N],s1[N],s2[N],s3[N],ch[N];
 int x;

 int main()
 {
     //freopen("a.in","r",stdin);

     //转换类型
     sscanf("123456aaa","%s",s);
     printf("s = %s\n",s);

     sscanf("","%d",&x);
     printf("x = %d\n",x);

     sscanf("","%4d",&x);//最多取前4位
     printf("x = %d\n",x);

     sscanf("123456aaa","%4s",s);//最多取前4位
     printf("s = %s\n",s);

     sscanf("123456abc","%[^b]",s);//遇到b则截止
     printf("s = %s\n",s);

     sscanf("123456abc abc","%[^ ]",s);//遇到空格则截止
     printf("s = %s\n",s);

     sscanf("123456abcabcAabc","%[^A-Z]",s);//遇到大写字母则截止
     printf("s = %s\n",s);

     sscanf("word1 word2 word3 word4", "%*s%s",s);//过滤掉第一个匹配到的%s，保留第二个
     printf("s = %s\n",s);

     sscanf("123456abc abc","%[1-9a-z]",s);//只取1-9 a-z的字符
     printf("s = %s\n",s);

     gets(ch);
     sscanf(ch," %s = %s + %s",s1,s2,s3);//方便处理输入格式
     printf("s1=%s s2=%s s3=%s\n",s1,s2,s3);

     return ;
 }

a.in

word1 = word2 + word3

输出

s = 123456aaa
x =
x =
s =
s = 123456a
s = 123456abc
s = 123456abcabc
s = word2
s = 123456abc
s1=word1 s2=word2 s3=word3