动态数组分配、指针、最小值、最大值、平均值、总和

问题描述 投票:0回答:0

我一直在尝试运行这段代码并不断出现分段错误,但数组确实打印出来了。 我到底做错了什么? 我相信问题主要出在函数的格式或我在函数中输入的参数上,我尝试了很多方法,但我尝试过的方法似乎都不起作用。

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


void fillArray(int arr[], int arr_size);
void printArray(int arr[], int arr_size);
void fMin(int arr[], int arr_size, int *q);
void fMax(int arr[], int arr_size, int *p);
void fSum(int arr[], int arr_size, int *x);


int main(int argc, char *argv[])
{
    int *arr=NULL;
    int arr_size = atoi(argv[1]);
    arr = malloc(arr_size * sizeof(int));

    if(argc <= 2)
    {
        printf("ERROR: invalid command line args");
        printf("Expecting: EXCECUTABLE <SIZE>");
    }

    fillArray(arr, arr_size);

    int i;
    for(i=0; i<arr_size; i++)
    {
        printf("argv[%d] - %2d", arr_size, arr[i]);
        printf("\n");
    }

    printArray(arr, arr_size);

    int *min, *max ,avg, sum;
    int *p;
    int *q;
    int *x;
    avg = sum / arr_size;

    fMax(arr, arr_size, p);
    fMin(arr, arr_size, q);
    fSum(arr, arr_size, &sum);

    printf("Max: %3d Pos: %3d \n", *max, *p);
    printf("Min: %3d Pos: %3d \n", *min, *q);
    printf("Sum: %3d \n", *x);
    printf("Avg: %3d \n", avg);

    //for realloc! printArray(arr, arr_size);

    free(arr);
    return 0;
}

void fillArray(int arr[], int arr_size)
{
     srand(time(NULL));
    int i;
    for(i=0; i<arr_size; i++)
    {
        arr[i] = rand() % 101;
    }
}//good!

void printArray(int arr[], int arr_size)
{
    int i = 0;
    printf(" POS | VAL \n");
    printf("-----------\n");
    for(i=0; i<arr_size; i++)
    {
         printf(" %3d | %3d \n", i, arr[i]);
     }
}//good!

void fMin(int arr[], int arr_size, int *q)
{
    int i;
    int *min=NULL;
    min=&arr[i];
    for(i=1; i<arr_size; i++)
    {
        if(arr[i] < *min)
        {
            min = &arr[i];
            q = &i;
        } 
    }
}//cant null pointer

void fMax(int arr[], int arr_size, int *p)
{
    int i;
    int *max=NULL;
    max = &arr[i];
        for(i=1; i<arr_size; i++)
        {
            if(arr[i] > *max)
            {
                max = &arr[i];
                p = &i;
            } 
        }
}//good?
void fSum(int arr[], int arr_size, int *x)
{
    int i;
    int sum = *x;
    for (i=0; i<arr_size; i++)
    {
        *x = i + arr[i];
    }
}//what  the  heckie goin on here

我跑"./a.out 5 6"

它输出:

argv[5] - 31
argv[5] - 13
argv[5] - 27
argv[5] - 83
argv[5] - 23
 POS | VAL 
-----------
   0 |  31 
   1 |  13 
   2 |  27 
   3 |  83 
   4 |  23 
zsh: segmentation fault  ./a.out 5 6
arrays c class pointers minmax
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