#include<stdio.h>
#define LENGTH 80
int put2(const*string);
int main(void)
{
    char ary[LENGTH];
    printf("Enter sth:");
    fgets(ary, LENGTH, stdin);
    printf("%d Words.\n", put2(ary));
    system("pause");
    return 0;
}
int put2(const char*string)
{
    int count=0;
    while (*string)
    putchar(*string++);
    count++;
    putchar("\n");
    printf("%d Words\n", count);
    if (count = 0)
        return NULL;
    else
        return count;
}

运行结果字符数总是？

#include<stdio.h>
#define LENGTH 80
//int put2(const*string);
int put2(const char *string);
int main(void)
{
    char ary[LENGTH];
    printf("Enter sth:");
    fgets(ary, LENGTH, stdin);
    printf("%d Words.\n", put2(ary));
    system("pause");
    return 0;
}
int put2(const char *string)
{
    int count=0;
    while (*string && *string!='\n')
    {
        putchar(*string++);
        count++;
    }
    putchar('\n');
    printf("%d Words\n", count);
    return count;
}

#include<stdio.h>
#include<stdlib.h>
#define LENGTH 80
int put2(const char *string);
int main(void)
{
    char ary[LENGTH];
    printf("Enter sth:");
    fgets(ary, LENGTH, stdin);
    printf("%d Words.\n", put2(ary));
    system("pause");
    return 0;
}
int put2(const char*string)
{
    int count=0;
    while (*string)
    {
        putchar(*string++);
        count++;
    }
    putchar('\n');
    printf("%d Words\n", count);
    if (count = 0)
        return NULL;
    else
        return count;
}