串的实现实验

#define MAXSTRLEN 255 typedef char SString[MAXSTRLEN+1];

１、串的联接 mystrcat(SString s1,SString s2,SString t); ２、求子串 mysubstr(SString t,int pos,int len,SString sub); ３、子串定位 mystrindex(SString t,SString sub,int *index);