用c语言写4、 创建文件，写入内容，输出结果 1) 在D盘创建一个文件“I have a dream.txt”； 2) 在该文件内，写入以下内容： I have a dream Martin Luther King I am happy to join with you today in what will go down in history as the greatest demonstration for freedom in the history of our nation. Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of their captivity. But one hundred years later, the Negro still is not free. 3) 打开该文件，将全部内容打印出来，关闭文件。

#include <stdio.h>

int main() {
    FILE *fp;
    fp = fopen("D:\\I have a dream.txt", "w");
    fprintf(fp, "I have a dream Martin Luther King I am happy to join with you today in what will go down in history as the greatest demonstration for freedom in the history of our nation. Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of their captivity. But one hundred years later, the Negro still is not free.\n");
    fclose(fp);

    fp = fopen("D:\\I have a dream.txt", "r");
    char ch;
    while((ch = getc(fp)) != EOF) {
        putchar(ch);
    }
    fclose(fp);
    return 0;
}

运行结果：

I have a dream Martin Luther King I am happy to join with you today in what will go down in history as the greatest demonstration for freedom in the history of our nation. Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice. It came as a joyous daybreak to end the long night of their captivity. But one hundred years later, the Negro still is not free.