C/Pointer/Pointer String
Reverse string content using its pointer
#include <stdio.h>
#include <string.h>
int main(void)
{
char str1[] = "Pointers are fun and hard to use";
char str2[80], *p1, *p2;
/* make p point to end of str1 */
p1 = str1 + strlen(str1) - 1;
p2 = str2;
while(p1 >= str1)
*p2++ = *p1--;
/* null terminate str2 */
*p2 = "\0";
printf("%s %s", str1, str2);
return 0;
}
split an entry of the form Last/First into two parts
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
char *my_strchr(char *string_ptr, char find){
while (*string_ptr != find) {
if (*string_ptr == "\0")
return (NULL);
++string_ptr;
}
return (string_ptr);
}
int main()
{
char line[80]="asdf";
char *first_ptr;
char *last_ptr;
line[strlen(line)] = "\0";
last_ptr = line;
first_ptr = my_strchr(line, "d");
if (first_ptr == NULL) {
fprintf(stderr,"Error: Unable to find "a" in %s\n", line);
}
return (0);
}