Test interview 5 implement the C library function strlen

Test interview 5 implement the C library function strlen

This is a very simple problem.

Strlen (str) is used to calculate the total number of characters in str.

When storing strings, A '\ 0' is added to the end of the last character '.

Use this to write your own strlen function.

Source code:

# Include
 
  
# Include
  
   
Int MyStrlen (char str []) {if (str = NULL) // judge whether str is valid return 0; int counts = 0; // directly use counts as the counter while (str [counts ++]! = '\ 0'); return counts-1;} int main () {char str1 [] = "hello"; // 5 char * str2 = "OK "; // 2 char * str3 = ""; // 0 char * str4; // 0 printf ("str1 = % s \ n", str1 ); printf ("strlen (str1) = % d \ n", MyStrlen (str1); printf ("str2 = % s \ n", str2 ); printf ("strlen (str2) = % d \ n", MyStrlen (str2); printf ("str3 = % s \ n", str3 ); printf ("strlen (str3) = % d \ n", MyStrlen (str3); printf ("str4 = % s \ n", str4 ); printf ("strlen (str4) = % d \ n", MyStrlen (str4); getch ();}
  
 

Test results:

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Author: unparalleled

Email: coderguang@gmail.com

Yu GDUT

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