Ch11 Ex5

#include <stdio.h>
#include <string.h>

int is_within(char ch, char string[]);
int main(void){
    printf("The number is %d.\n", is_within('h', "hello"));

    return 0;
}

int is_within(char ch, char string[]){
    int instring=0; //false
    unsigned long length=strlen(string);
    unsigned long count=0;
    char *ptr=string;
    while(count!=length){
        if(*ptr==string[count])
            instring=1;//true
            break;
        ptr++;
        count++;
    }
    return instring;
}