Thread: Desperately Need Help

MY PROBLEM FIXED TY

Double quotes are for strings. Single quotes are for single characters. You can't compare strings with the equality operator. You can't store a string in a single character*. You don't flush input streams either.


Quzah.

*Actually you can, but the "string" will consist of only a single nul character.

> fflush(stdin);
Read the FAQ.

Use fgets() to read ALL input.
Messing about with scanf() is just more trouble than it's worth in the end.

okay thanks for the advice, i am learning about fgets() now. If i use fgets() will i still have to test it like i did with scanf? Can i still use printf with the fgets or should i use puts? OR should i use printf for the numbers and puts for the chars?
Also, fgets(char *, int , FILE *); << apparently this is the syntax, does the FILE bit mean the memory address of the pointer? does the int mean the buffer size of the char array? (in this case 2?) does the char * mean the char pointer? (why does it even need a pointer?)

The following code is WRONG, but why?

Code:

#include <stdio.h>

int main(void)
{
	char *cYesNo[2];

	printf("Enter Y or N");
	fgets(*cYesNo,2, stdin);
	printf("You typed: %s\n", cYesNo);

	return 0;
}

And btw, i can't find the relevant information on fgets on the internet or in the FAQ. Which is why im asking.

You have an array of pointers to characters. Remove the *.


Quzah.

i wasn't aware i had to initialize it as it is just a null variable until
the user inputs

It's not null. It's uninitialized. That mean it has some seemingly random value in it.

Code:

iTestScan = fgets(iAge,sizeof iAge,stdin);

The first argument to fgets is supposed to be a buffer of characters you read your input into. They you pull what you need out of it. You should read the FAQ on it again.


Quzah.

Code:

char buff[BUFSIZ];
while ( iTestScan == 0 &&
        fgets( buff, sizeof buff, stdin ) != NULL ) {
  int temp;
  if ( sscanf( buff, "%d", &temp ) == 1 && temp != 0 ) {
    iTestScan = temp;
  }
}

Should i use strtol() in my program to turn the input from fgets to integers on the questions where the user is asked to input age?

is this correct usage of what Salem coded:

Code:

#include<stdio.h>

int main(void)
{
	char buff[4];
	int iTestInput;

	do
	{
	printf("Please enter your age: ");
	iTestInput = fgets(buff, sizeof buff, stdin);
	}while (iTestInput == 0 && fgets(buff, sizeof buff, stdin) != NULL) ;

	if (buff < 18)
	{
		printf("young");
	}
	else if (buff >= 18)
	{
		printf("not young");
	}
	
	return 0;
}