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

void main()
{
    FILE *fp;
    char ch, filename[20];

    printf("Please input the filename you want to write:");
    scanf("%s", filename);

    if(!(fp = fopen(filename, "wt")))
    {
        printf("Cannot open the file!\n");
        exit(0);
    }
   
    printf("Please input the sensentence you want to write:");
    ch = getchar();  //接受回车的符
    ch = getchar();  //接受输入的第一个字母

    while(ch != EOF)
    {
        fputc(ch, fp);
        ch = getchar();
    }

    fclose(fp);
}
图片如下：

自己先顶一下啊！呵呵！