#include <stdio.h>

int *arr_first_max(const int *a, size_t n);

int *arr_last_max(const int *a, size_t n);

size_t str_replace(char *s, int oldc, int newc);

char *str_find_last(const char *s, int c);

int main()

{

int a[] = {1,3,4,5,7,7,3,5,7,4,4,2,3,7};

char b[] = "hello world";

printf("%d\n",*arr_first_max(a, 14));

printf("%d\n", *arr_last_max(a, 14));

printf("%ld\n", str_replace(b, 'l', 'x'));

printf("%c\n", *str_find_last(b, 'e'));

getchar();

return 0;

}

int *arr_first_max(const int *a, size_t n) {

const int *p;

const int *max = a;

for (p = a; p<a + n; p++)

if (p > max)

max = p;

return (int*)max;

}

int *arr_last_max(const int *a, size_t n) {

const int *p;

const int *max = a;

for (p = a; p<a + n; p++)

if (p >= max)

max = p;

return (int*)max;

}

size_t str_replace(char *s, int oldc, int newc) {

size_t rep = 0;

char *p;

for (p = s; *p != '\0'; p++)

if (*p == oldc) {

*p = newc;

rep++;

}

return rep;

}

char *str_find_last(const char *s, int c) {

const char *p;

const char *last = 0;

for (p = s; *p != '\0'; p++)

if (*p == c)

last = p;

return (char*)last;

}