查找字符在所在字符串中的个数

#include<stdio.h>
char find_word(char *p,char c)
{
    int n=0;
    while (*p!='\0')
    {
        if(*p==c)
        {
            n++;
        }
        p++;
    }
    return n; 
}
int main()
{
    char a[]="hello world";
    char c;
    scanf("%c",&c);
    printf("%d\n",find_word(a,c));
}