c - 使用指针和动态存储在启动时传递未知大小的字符串的程序

Question

这是我的任务:

Write a program and the following functions using dynamic storage to manipulate the character strings.

a. A function to input an unknown number of character strings of unknown length (max 80) and store each string in dynamic storage.

b. A function to output each character string and its corresponding length in terms of the number of characters.

The program should begin by reading the number of character strings to be processed and allocating dynamic storage for the pointers.

我的代码如下。此版本编译良好但在尝试获取输出时中断。

感谢任何帮助。

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


int funcinput (char **, int *,char *);
void funcoutput (char **, int *);

int main()
{
   char c;
   int *n;
   char *ptr;
   char **userinput=calloc(*n,80);

   funcinput (userinput,&*n,&*ptr);
   funcoutput (userinput,&*n);
}


int funcinput(char **userinput, int *n, char *ptr)
{   
  char c;
  int counter =0;
  int max=0;

  printf("How many items are in your list\n");
  scanf("%d",&*n);

  max = *n;

  ptr = (char*)calloc(*n,80);

  printf("Enter your list, each item can be a max of 80 characters long:\n");
  for (counter=0;counter<*n;counter++)
  {
   scanf("%80s",&userinput[c]);  
  } 
  return;
 }

void funcoutput (char **userinput,int *n)
{
char c;
int counter1=0;
int max1=0;

max1 = *n;

printf ("You entered %d strings of charectors\n",*n);
printf ("The following is the list you entered \n");
for(counter1=0;counter1<max1;counter1++)
{
    printf("\n%-80s         \n",*userinput[c]);
}
return;
}

Answer 1

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

char **funcinput (int *size /* out */);
void funcoutput (char **out_array, int size);

int main(){
    //char c;//unused
    int n;
    //char *ptr;//unused
    char **userinput = funcinput(&n);

    funcoutput(userinput, n);
    //deallocate
    int i;
    for(i=0;i<n;++i){
        free(userinput[i]);
    }
    free(userinput);
    return 0;
}

char **funcinput(int *n){// n : output size
    int counter =0;
    int max=0;

    printf("How many items are in your list\n");
    scanf("%d", n);

    max = *n;

    char **userinput = calloc(max, sizeof(char*));

    printf("Enter your list, each item can be a max of 80 characters long:\n");
    for (counter=0;counter < max;counter++){
        userinput[counter] = calloc(80, sizeof(char));
        if(1!=scanf("%79s", userinput[counter])){//spaces not includes
            free(userinput[counter]);
            break;
        }
    }
    *n = counter;
    return userinput;
}

void funcoutput (char **userinput,int n){
    int counter=0;
    int max=n;

    printf ("You entered %d strings\n", n);
    printf ("The following is the list you entered \n");
    for(counter=0;counter<max;counter++){
        printf("%s\n", userinput[counter]);//%-80s : Probably not necessary
    }
}