Why do I need to type Ctrl-D twice to mark end-of-file?

Question

char **query; 
query = (char**) malloc ( sizeof(char*) );

int f=0;
int i=0,j=0,c;


while((c=getchar())!=EOF)
{      
    if(!isalpha(c))
        continue;

    if(         


        

Answer 1

The Return key doesn't produce EOF that's why the condition getchar() != EOF doesn't recognize it. You can do it by Pressing CTRL+Z in Windows or CTRL+D in Unix.