strcspn()用来检索字符串s1开头连续有几个字符都不含字符串s2中的字符,其原型为:
int strcspn(char *s1, char *s2);
【参数说明】s1、s2为要进行查找的两个字符串。
strcspn()从字符串s的开头计算连续的字符,而这些字符都完全不在字符串s2中。简单地说,若strcspn()返回的数值为n,则代表字符串s1开头连续有n 个字符都不含字符串s2中的字符。
【返回值】返回字符串s1开头连续不含字符串s2内的字符数目。
注意:strcspn()会检查字符串结束标志'\0';如果s1中的字符都没有在s2中出现,那么将返回s1的长度;检索的字符是区分大小写的。
【函数示例】返回s1、s2包含的相同字符串的位置。
- #include<>
- #include<>
- int main()
- {
- char* s1 = "/cpp/u/biaozhunku/";
- char* s2 = "c is good";
- int n = strcspn(s1,s2);
- printf("The first char both in s1 and s2 is :%c\n",s1[n]);
- printf("The position in s1 is: %d\n",n);
- return 0;
- }
#include<> #include<> int main() { char* s1 = "/cpp/u/biaozhunku/"; char* s2 = "c is good"; int n = strcspn(s1,s2); printf("The first char both in s1 and s2 is :%c\n",s1[n]); printf("The position in s1 is: %d\n",n); return 0; }
再看一个例子,判断两个字符串的字符是否有重复的。
- #include<>
- #include<>
- int main()
- {
- char* s1 = "/cpp/xitong/";
- char* s2 = "z -+*";
- if(strlen(s1) == strcspn(s1,s2)){
- printf("s1 is diffrent from s2!\n");
- }else{
- printf("There is at least one same character in s1 and s2!\n");
- }
- return 0;
- }