Instr(n,s1,s2)返回在s1字符串中，從第n個字符開始，尋找s2字符，找到返回位置，找不到返回0（s2也可以是字符串（即字符數組）；如果s2長度大于s1，也返回0）如Instr(2,"abcd","c")=3Instr(2,"abcd","cd")=3...
2 回答
慕哥6287543
TA貢獻1831條經驗 獲得超10個贊
當然有：
#include <string.h>
char *strstr(const char *haystack, const char *needle);
Return
It returns a pointer into the string haystack that is the first character of
the substring, or a null pointer if no match was found. If needle is an empty
string, the function returns haystack.
Description
This is like strchr() , except that it searches haystack for a substring
needle rather than just a single character.
順便，如果你自己寫不出這樣的函數，不建議你繼續學習C。
慕姐8265434
TA貢獻1813條經驗 獲得超2個贊
沒有，有這個函數
char *strchr(cs, c)
return pointer to first occurrence of c in cs or NULL if not present
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