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Help Me! C Programming

  • 19-10-2011 7:20pm
    #1
    Taffy Kat
    Closed Accounts Posts: 327 ✭✭


    I'm having massive trouble with an assignment for a C Programming course.

    I've got to build a program which uses while to work out if a number a user enters is prime or not.

    I've got to make another program which prints all the prime numbers between 1 and 100.

    I've got these working for even numbers but I have no idea how to get the computer to calculate prime.

    I've got to make a program which allows a user to guess a pre-defined number within the range of 1-10. If the user guesses a number outside this range its to ask user to re-enter a guess within the range.

    This is my code... It asks a user to re-enter a number whether the number is within the range or not.
    #include<stdio.h>
#define ANSWER 4 /*Define constant of ANSWER*/

int main()

{
int guess;
printf("This is a number between 1 and 10. Enter your guess:"); /*Read guess from the keyboard*/
scanf("%d" ,&guess); /*Read user input*/

while 
	( guess >= 1 && guess <= 10 ); /*While loop to determine if guess is within correct range*/
	{
	printf("Please enter another guess within the correct range:\n"); /*Prompts for a new guess*/
	scanf("%d", &guess);
}

while 
	( guess < 1 && guess > 10 ); /*While loop to determine if guess is within correct range*/
	{
	

if ( guess == ANSWER ) /*If clause to define if user's guess is correct*/
{
printf("You guessed correctly, the answer was 4."); /*If guess is correct this message will show*/
}

if (guess < ANSWER) /*If clause to define if user's guess is smaller than ANSWER*/
{
printf("You guessed incorrectly, the answer is greater."); /*If guess is smaller this message will show.*/
}

if (guess > ANSWER) /*If clause to to define if user's guess is greater than ANSWER*/
{
printf("You guessed incorrectly, the answer is smaller."); /*If guess is smaller then this message will show */
}

}

return 0;
}

    And I've got to add a count to the above code whereby the program says "You've 2 guesses left. You've 1 guess left. You've 0 guesses left." When the user enters within the correct range but the incorrect number.


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