首字母大写，指针，文件

Question

从一个文件中读取一篇英文文章，请将文章中所有单词首字母大写并存入另一个文件中。“单词”是指一串连续的字母。

函数接口定义：

void CapitalizeTheFirstLetter(FILE *in, FILE *out);

说明：参数 in 和 out 为指示两个文件的指针。函数从 in 所指文件中的读出数据，将结果写入 out 所指的文件中。

裁判测试程序样例：

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

void CapitalizeTheFirstLetter(FILE *in, FILE *out);

int main()
{
    FILE *in, *out;

    in = fopen("in.txt", "r");
    out = fopen("out.txt", "w");

    if (in && out)
    {
        CapitalizeTheFirstLetter(in, out);
    }
    else
    {
        puts("文件无法打开!");
    }

    if (in)
    {
        fclose(in);
    }
    if (out)
    {
        fclose(out);
        puts("文件保存成功!");
    }
    return 0;
}
/* 请在这里填写答案 */

输入样例：
Spring Morning

translated by Xu Yuanchong

This spring morning in bed I am lying,

not awake till birds are crying.

After one night of wind and showers,

how many are the fallen flowers.
输出样例：
程序运行结束后，打开“out.txt”文件，查看文件内容。

Spring Morning

Translated By Xu Yuanchong

This Spring Morning In Bed I Am Lying,

Not Awake Till Birds Are Crying.

After One Night Of Wind And Showers,

How Many Are The Fallen Flowers.

Answer 1

#include <stdio.h>
#include <ctype.h>

void CapitalizeTheFirstLetter(FILE *in, FILE *out) {
    int c, prev_char = '\n';

    while ((c = getc(in)) != EOF) {
        if (prev_char == '\n' || prev_char == ' ' || prev_char == '\t' || prev_char == '\r' || prev_char == '\f') {
            c = toupper(c);
        }
        fputc(c, out);
        prev_char = c;
    }
}