Write instructions on how strlen, strcpy, strcat are implemented

Arbitrarily define a char type string array, with char string[] = "iphone", for example.

Implement Strlen

Char string[] = "iphone";

int i = 0;

while (string[i]! = ' + ') {

i + +;

}

printf ("%d", I);

Implement strcpy

Char string1[20] = "ios";

Char string2[] = "Android";

strcpy (STRING1,STRING2);

int i = 0;

while (string2[i]! = ' + ') {//the computer recognizes the string after ' \ ", the condition is set, the copy stops

String1[i] = String2[i];

i + +;

}

String1[i] = ' + '; The first string is ' + ' and the string is finally added

printf ("%s", string1);

Implement Strcat

Char string1[] = "ios";

Char string2[] = "Android";

long int length = strlen (string1);

int i = 0;

while (string2[i]! = ' + ') {//Computer until recognized '/', the condition is set, stitching stops

String1[i + length] = String2[i];

i + +;

}

String1[i + length] = ' + '; Plus the length of the destination string

printf ("%s", string1);

Write instructions on how strlen, strcpy, strcat are implemented