How can I read an input string of unknown length?

Question

If I don\'t know how long the word is, I cannot write char m[6];,
The length of the word is maybe ten or twenty long. How can I use scanf to ge

Answer 1

i also have a solution with standard inputs and outputs

#include
#include
int main()
{
    char *str,ch;
    int size=10,len=0;
    str=realloc(NULL,sizeof(char)*size);
    if(!str)return str;
    while(EOF!=scanf("%c",&ch) && ch!="\n")
    {
        str[len++]=ch;
        if(len==size)
        {
            str = realloc(str,sizeof(char)*(size+=10));
            if(!str)return str;
        }
    }
    str[len++]='\0';
    printf("%s\n",str);
    free(str);
}