题目:

有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列),输出到一个新文件C中。

程序分析:

  1. 步骤分析:读取文件;处理信息;写入文件;

程序源代码:

#include "stdio.h" 

int main()
{
    FILE *fp;

    int i, j, n, ni;

    char c[160], t, ch;

    if ((fp = fopen("A", "r")) == NULL)
    {
        printf("file A cannot be opened\n");
        
        return 0;
    }

    printf("\n A contents are :\n");

    for (i = 0; (ch = fgetc(fp)) != EOF; i ++)
    {
        c[i] = ch;
    
        putchar(c[i]);
    }

    fclose(fp);

    ni = i;

    if ((fp = fopen("B", "r")) == NULL)
    {
        printf("file B cannot be opened\n");
        
        return 0;
    }

    printf("\n B contents are :\n");

    for (i = 0; (ch = fgetc(fp)) != EOF; i ++)
    {
        c[i] = ch;

        putchar(c[i]);
    }

    fclose(fp);

    n = i;

    for (i = 0; i < n; i ++)
        for (j = i + 1; j < n; j ++)
            if (c[i] > c[j])
            {
                t = c[i];
                
                c[i] = c[j];
                
                c[j] = t;
            }

    printf("\n C file is:\n");

    fp = fopen("C","w");

    for (i = 0; i < n; i ++) 
    {
        putc(c[i], fp);

        putchar(c[i]);
    }

    fclose(fp);
}

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