根据字符串的长度对静态数组中的字符串进行排序会导致崩溃? |错误的分配/访问权限| [英] Sorting Strings in a static array based on their length crashes? |wrong allocation/access|

问题描述

我想创建一个字符串数组，并根据它们的长度(最小->最大)对它们进行排序，但是程序在所有输入后都崩溃了.
并且绕过元素0(在输入过程中直接从元素1开始)

I wanted to make an array of strings and sort them in order based on their length (smallest -> biggest) but the program crashes after all inputs.
And also it bypasses Element 0 (starts directly from element 1 during input)

 #include <stdio.h>
    #include <stdlib.h>
    main()
    {
        int i,j,N;
        printf("\nInput amount of  alphanumericals: ");
        scanf("%d",&N);
            {
                int min;
                char *swap=(char*)malloc(sizeof(char)*150);
                char *A[N],**temp; 
                for(i=0;i<N;i++)
                    *(A+i)=malloc(sizeof(char)*N);//Error Here
                temp=A;
                for(i=0;i<N;i++){
                    printf("\nInput  %d element:",i+1); 
                    fgets(temp+i,150,stdin);//And Here
                }


    printf("\n\nData [");
    for(i=0;i<N;i++)
        printf(" %s",A[i]);
    printf(" ]\n\n");

    //insertion sort
    for(i=0;i<N;i++){
        min=i;
        for(j=i+1;j<N;j++){

            if(strcmp(A[j],A[min])<0){
                min=j;
            }

        }   
        if(min!=i){
            swap=A[i];
            A[i]=A[min];
            A[min]=swap;
        }   
    }
    free(swap);
    printf("\n\nInsertion Sorted Data [");
    for(i=0;i<N;i++)
        printf(" %s",A[i]);
    printf(" ]");
    }
return 0;
}

推荐答案

此错误:

 for(i=0;i<N;i++)
    *(A+i)=malloc(sizeof(char)*N);//Error Here

我是用g ++编译器复制的，如果您也是这种情况，即您也使用g ++进行编译，则将强制类型转换为char *:

i reproduced with g++ compiler, if this is your case also i.e. you also compiling with g++ add casting to char* :

*(A+i)= (char*) malloc(sizeof(char)*N);//Error Here

第二个问题是因为您尝试传递char **而不是char * 解决:

The second issue is because you trying to pass char** instead of char* fix :

fgets(*(temp+i),150,stdin);//And Here

在scanf(％d"，& N);之后也加上括号.限制变量 min 和 swap 的范围，因此以后的所有内容都不可见.

Also brackets after scanf("%d",&N); limits scope of variables min and swap , so later should not be visible at all.

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