在字符串中查找字符然后在该字符前插入字符

Question

I am studying about string in C and I have this question . I've had a look at some question in stackoverflow but I cant find the same Question,if there is pls give me the link :D

For exp,I have a string "D://test.txt"

Now I want to convert it to "D://test1.txt"

I know that I have to find . in the string,then put the number befor it,but I dont know how to do it. Pls help me out :(

Answer 1

Use strchr() (or strrchr() ) to find the dot. Both functions have their prototype in <string.h> .

There is no ready-made function for inserting a character in the middle of a string. You have to write your own.