Implementation mystrcpy (), mystrcmp (), Mystrcat (), Mystrlen ()

#include <stdio.h> #include <stdlib.h> #include <assert.h>/*mystrcpy: Copies the characters from the from character to the string to, including the null-value terminator. *//*MYSTRCMP: Compare String str1 and str2 return value explanation less than 0str1 are + than str2equal to 0STR1 are equal to Str2greater than 0STR1 are Greater than Str2*//*mystrcat: The function connects the string str2 to the end of str1 *//*mystrlen: The function returns the length of the string Str (that is, the number of characters before the null terminator). */void mystrcpy (char *to, const char *from), int mystrcmp (const char *STR1, const char *str2), void Mystrcat (char *str1, con St Char *str2); size_t Mystrlen (char *str); int main () {char str1[20] = "ABCDFG"; char str2[] = "ABCDE";//mystrcat (STR1,STR2) ;//mystrcpy (STR1,STR2);p rintf ("%d\n", Mystrlen (STR1)); System ("pause"); return 0;} void mystrcpy (char *to, const char *from) {assert ((to! = null) && (from! = null)); while ((*to++ = *from++)! = ' + ') ; *to = ' + ';} int mystrcmp (const char *STR1, const char *str2) {assert (str1! = null) && (str2! = null)); (*STR1) && (*STR2) && (*str1 = = *STR2); + str1,++ str2); return (*STR1-*STR2);} void MystrcaT (char *str1, const char *str2) {assert ((str1!=null) && (str2!=null)); char* ret = Str1;for (; *STR1! = '); ++str1 ); while ((*str1++ = *str2++)! = ' + ');} size_t Mystrlen (char *str) {assert (str! = NULL); size_t length = 0;for (; *str++! = ' + '; length + +); return length;}

　　

Implementation mystrcpy (), mystrcmp (), Mystrcat (), Mystrlen ()