使用程序的输出作为同一程序中的输入 [英] using output of a program as input in same program

问题描述

我正在编写一个程序，以生成给定数字序列的所有可能的排列，然后从该排列中生成所有可能的二叉树，因此，我认为有一个程序可以生成排列并将结果存储到文件中，然后编写更多代码以逐行读取(包含所有置换)并从中生成二进制树，因此，现在我编写了半个程序，该置换生成置换并将结果存储在文件中.

I am writing a program to generate all possible permutations of a given series of numbers and then generate all possible binary trees from that permutations so, what I thought is having a program which generates permutations and stores the result to a file and then write further code to read line by line (which has all permutations ) and generate binary trees out of them, so right now I have written half program which generates permutation and it stores the result in file.

#include <stdio.h>

//function to print the array
void printarray(int arr[], int size)
{
        FILE *fp;
    int i,j;
        fp=fopen("result.txt","w");
    for(i=0; i<size; i++)
    {
          //  printf("%d\t",arr[i]);
          fprintf(fp,"%d\t",arr[i]);
    }
    printf("\n");
    fclose(fp);
}

//function to swap the variables
void swap(int *a, int *b)
{
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
}

//permutation function
void permutation(int *arr, int start, int end)
{
    if(start==end)
    {
        printarray(arr, end+1);
        return;
    }
    int i;
    for(i=start;i<=end;i++)
    {
        //swapping numbers
        swap((arr+i), (arr+start));
        //fixing one first digit
        //and calling permutation on
        //the rest of the digits
        permutation(arr, start+1, end);
        swap((arr+i), (arr+start));
    }
}

int main()
{
   //taking input to the array
    int size;
    printf("Enter the size of array\n");
    scanf("%d",&size);
    int i;
    int arr[size];
    for(i=0;i<size;i++)
        scanf("%d",&arr[i]);
    //calling permutation function
    permutation(arr, 0, size-1);
    return 0;
}

但是此程序中的问题是该程序仅存储一个排列，而没有将其他排列存储在result.txt文件中，我该如何继续存储结果.程序也不会结束空白光标闪烁，这会给错误的无限while循环印象. 我必须按Ctrl + c结束程序才能摆脱这种情况?

but the problem here in this program is that this program only stores one permutation and does not stores other permutations in result.txt file, how do I go on storing result this way. Also program does not ends a blank cursor blinking which gives a false impression of infinite while loop. I had to press Ctrl+c to end the program how to get rid of this?

推荐答案

#include<string.h>
#include<stdio.h>
#include<stdlib.h>
#define N 10

void print(int *num, int n)
{
        FILE *fp;
        fp=fopen("result.txt","a");
    int i;
    for ( i = 0 ; i < n ; i++)
//        printf("%d ", num[i]);
          fprintf(fp,"%d ",num[i]);
    fprintf(fp,"\n");
   fclose(fp);
}
int main()
{
    int num[N];
    int *ptr;
    int temp;
    int i, n, j;
    printf("\nHow many number you want to enter: ");
        scanf("%d", &n);
    printf("\nEnter a list of numbers to see all combinations:\n");
    for (i = 0 ; i < n; i++)
        scanf("%d", &num[i]);
    for (j = 1; j <= n; j++) {
        for (i = 0; i < n-1; i++) {
            temp = num[i];
            num[i] = num[i+1];
            num[i+1] = temp;
            print(num, n);
        }
    }
    return 0;
}

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