include<stdio.h>
int strlen_(const char *string);
int strlen_(const char *string)
{
int length;
for(length = 0; *string != '\0'; string++){
length++;
}
return length;
}
char *strcat_(char *string1, const char *string2);
char *strcat_(char *string1, const char *string2)
{
char *p = string1;
if(string1 == NULL || string2 == NULL)
return string1;
while(*string1 != '\0')
string1++;
while(*string1++ = *string2++)
;
return p;
}
int main()
{
char *string1 = "my";
char *string2 = "me";
int num = strlen_(string1);
printf("the length before strcat is %d\n", num);
strcat_(string1,string2);
int num2 = strlen_(string2);
printf("the length after strcat is %d", num2);
printf("\nThis is it!\n");
return 0;
}