Ask the user in C ?

[coool]

hey guys..

using C language,

how can I ask the user to enter a positive integer

in only these forms --> binary, octal, decimal, or hexadecimal

then save it in a charachter array !

after that I ask the user this question what's the base of this positive number..

and from here I can tell if the form is octel or decimal or .. etc ! ..

[MacGyver]

Try scanf().

You can use %i in scanf() to read all octal, decimal, and hexadecimal depending upon the prefix the user gives the number. Otherwise, you can use %o, %d, and %x respectively.

You can also use a method of reading the line as a string, and then using strtol() on the number, where you can tell the function what base to interpret the number.

To save in a char array from an int, you could use sprintf() or snprintf().

[coool]

This is what I've done so far..

#include <stdio.h>

int main()
{
	char posNumChar[30];

    printf("Please enter positive number: ");
	
    fgets(posNumChar, 30, stdin);

    printf("You entered this positive number, %s", posNumChar);

    getchar();
}

now I want to do the second step.. which is asking the user for the base of the number he entered..

I've been asked to avoid using scanf() to a character and using getchar() --- IN THIS STEP only !

is there any other functions that work the same way as scanf and getchar !! ..

[Salem]

Another call to fgets() perhaps, storing the result in another string.

[zacs7]

That or use fgets() again as Salem suggested, pull out what you want with sscanf() store the result in another variable.
However in your case so far, that's clearly redundant.