#include <stdio.h>

char *StrChar(char *s, const char c) {
	while (*s != c && *s != '\0')
		s++;
	if (*s == '\0')
		return (NULL);
	else
		return (s);
}

void main(void) {
	char *p;
	char c;
	char str[ ] = "abcdefghijklmnopqrstuvwxyz";
	
	printf("str = %s\n", str);
	printf("Please enter one letter\t");
	scanf("%c", &c);
	
	p = StrChar(str, c);
	printf("\nStrChar(str, '%c');\n", c);
	if (p != NULL)
		printf("%s\n\n", p);
	else
		printf("can not find!\n");
}