How can i limit the character to be input in urname and surname?

Question

Zsmash 0 Newbie Poster

11 Years Ago

#include <windows.h>
#include <stdio.h>
#include <conio.h>

void gotoxy(int x,int y);

int main(int argc, char *argv[])


    {


    char urname[1],surname[1],fullname[1];

    start:

    system("COLOR 1c");

    gotoxy(11,9);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,10);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,11);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");   

    gotoxy(11,12);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,13);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");   

    gotoxy(11,14);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,15);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");   



    gotoxy(14,10);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),121);
    printf(" Please enter your name:      ");
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),151);
    printf("                         ");





    gotoxy(14,12);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),121);
    printf(" Please enter your surname:   ");
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),151);
    printf("                         ");


    gotoxy(14,14);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),121);
    printf(" Your name is:                ");
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),151);
    printf("                         ");



    gotoxy(45,10);
    gets(urname);


    gotoxy(45,12);
    gets(surname);

    gotoxy(45,14);
    printf("%s %s",urname,surname);
    gets(fullname);
{    
     char choice;

   gotoxy(35,11);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
    printf(" Do you want to enter  ");
   gotoxy(35,12);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
    printf(" another entry?        ");
   gotoxy(35,13);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
    printf(" YES                  ");
   gotoxy(40,13);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
    printf("          NO      ");
    choice= getche();
   if (choice=='y'){
   goto start;
}
   else
   printf("BYE");
}





}


void gotoxy(int x, int y){
     COORD coord = {x,y};
     SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);


     }

c

Edited 11 Years Ago by JorgeM because: move to C forum

3 Contributors
5 Replies
342 Views
1 Day Discussion Span
Latest Post 11 Years Ago Latest Post by Ancient Dragon

Ancient Dragon 5,243 Achieved Level 70

11 Years Ago

char urname[1],surname[1],fullname[1];

How many people do you know who have a first, middle and last name that consists of only 1 character??? gets() doesn't allocate new memory, you have to do that yourself. You sort of have to guess about how big to make those variables then use fgets(), not gets(), to limit user input like this:

fgets(urname, sizeof(urname), stdin);

Ancient Dragon 5,243 Achieved Level 70

11 Years Ago

fgets() is declared in stdio.h not stdlib.h. Your program doesn't need wincon.h because it isn't using anything from that file.

Edited 11 Years Ago by Ancient Dragon

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thanhvy 0 Newbie Poster · Answer 1 · 2013-09-04T17:59:33+00:00

You can't limit characters by using gets
I create simple function to limits input string

#include <Windows.h>
#include <WinCon.h>
#include <conio.h>
#include <stdlib.h>

void gotoxy(int x,int y);
void gets_ex(char*, int max_chars);

int main(int argc, char *argv[])
{
    char urname[10], surname[10], fullname[20];

start:

    system("COLOR 1c");

    gotoxy(11,9);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,10);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,11);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");   

    gotoxy(11,12);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,13);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");   

    gotoxy(11,14);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");

    gotoxy(11,15);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),291);
    printf("                                                             ");   

    gotoxy(14,10);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),121);
    printf(" Please enter your name:      ");
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),151);
    printf("                         ");

    gotoxy(14,12);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),121);
    printf(" Please enter your surname:   ");
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),151);
    printf("                         ");


    gotoxy(14,14);
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),121);
    printf(" Your name is:                ");
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),151);
    printf("                         ");

    gotoxy(45, 10);
    // gets(urname);
    // fgets(urname, 10, stdin);
    gets_ex(urname, 10);

    gotoxy(45, 12);
    //gets(surname);
    gets_ex(surname, 10);

    gotoxy(45, 14);
    printf("%s %s",urname,surname);
    //gets(fullname);
    gets_ex(fullname, 20);

    {    
        char choice;

        gotoxy(35,11);
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
        printf(" Do you want to enter  ");
        gotoxy(35,12);
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
        printf(" another entry?        ");
        gotoxy(35,13);
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
        printf(" YES                  ");
        gotoxy(40,13);
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),11);
        printf("          NO      ");
        choice= getche();
        if (choice=='y')
        {
            goto start;
        }
        else
            printf("BYE");
    }
}

void gotoxy(int x, int y)
{
    COORD coord = {x,y};
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);
}

void gets_ex(char* pszOut, int max_chars)
{
    int ch;
    int nchar = 0;
    memset(pszOut, '\0', max_chars);

    do
    {
        ch = getch();

        if(ch != VK_RETURN && nchar < max_chars - 1)
        {
            putch(ch);
            pszOut[nchar] = ch;
            nchar++;
        }
    }
    while(ch != VK_RETURN);
}

Zsmash 0 Newbie Poster · Answer 2 · 2013-09-05T04:19:27+00:00

Zsmash 0 Newbie Poster

11 Years Ago

@thanhvy
thank you sir... it works :)

Zsmash 0 Newbie Poster · Answer 3 · 2013-09-05T04:29:41+00:00

even if there's no

#include<WinCon.h>
#include<stdlib.h>

>