Originally Posted by redaqen

When I inserted while(TRUE) it gave me an error saying that TRUE was undefined. Was that supposed to be while(true) ?

I went through the program and changed some of the functiions from ints to voids. For checkPrime, I now have it set to return 1 if it is not a prime and 0 if it is, so I kept it as an int.

Now, however, I get an error for line 102. It says error: expected declaration or statement at end of input.

Also, can anybody help me figure out an easy way to store the digits of an integer as an array or a string?

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#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
#include<math.h>
 
int enterNewNumber();
void printReversed(int);
void checkPalindrome(int);
int checkPrime(int);
void printPrimeFast(int);
void printPrimeSlow(int);
void printPrimeFactors(int);
 
int main(void){
        int choice;
        int number;
        while (true){
        printf(" 1. Enter a new number.\n 2. Print number reversed.\n 3. Check if number is a palindrome.\n 4. Check if number is prime.\n 5. Print all prime numbers up to number (slow).\n 6. Print all prime numbers up to number (fast).\n 7. Print the prime factorization of the number.\n 8. Quit\n");
        printf("Please select an option from the list: ");
        scanf("%d", &choice);
        printf("You selected choice %d.\n", choice);
        switch(choice){
                case 1: number = enterNewNumber();
                        break;
                case 2: printReversed(number);
                        break;
                case 3: checkPalindrome(number);
                        break;
                case 4: checkPrime(number);
                        break;
                case 5: printPrimeFast(number);
                        break;
                case 6: printPrimeSlow(number);
                        break;
                case 7: printPrimeFactors(number);
                        break;
                case 8: exit(0);
                        break;
                default: printf("Your choice was invalid.\n Please choose a number from the list.\n");
                        main();
 
                }
        }
return 0;
}
 
int enterNewNumber(){
        int n;
        printf("Please enter an int > 2:\n");
        scanf("%d", &n);
        if(n<2){
                printf("The int you entered was < 2.\n The int has been set equal to 2.\n");
                n=2;
                return n;
        }
return n;
}
 
void printReversed(int number) {
        int digit;
        int n = number;
        printf("This is your number: %d.\n", n);
        printf("This is your number reversed: ");
        while(n>0) {
                digit=n%10;
                printf("%d", digit);
                n=n/10;
        }
        printf("\n");
 
}
 
void checkPalindrome(int number){
        /*stuff*/
 
}
 
int  checkPrime(int number){
        int n=number, den;
        for(den=2; den*den<=n; ++den){
                if(n%den==0){
                        printf("Your number is not prime.\n It is divisible by %d.\n", den);
                        return 1;
                }
        printf("Your number is prime.\n");
return 0;
}
 
void printPrimeFast(int number){
        /*stuff*/
 
}
 
void printPrimeSlow(int number){
        /*stuff*/
 
}
 
void printPrimeFactors(int number){
        /*stuff*/
 
}

#include<stdio.h> #include<stdlib.h> #include<stdbool.h> #include<math.h> int enterNewNumber(); void printReversed(int); void checkPalindrome(int); int checkPrime(int); void printPrimeFast(int); void printPrimeSlow(int); void printPrimeFactors(int); int main(void){ int choice; int number; while (true){ printf(" 1. Enter a new number.\n 2. Print number reversed.\n 3. Check if number is a palindrome.\n 4. Check if number is prime.\n 5. Print all prime numbers up to number (slow).\n 6. Print all prime numbers up to number (fast).\n 7. Print the prime factorization of the number.\n 8. Quit\n"); printf("Please select an option from the list: "); scanf("%d", &choice); printf("You selected choice %d.\n", choice); switch(choice){ case 1: number = enterNewNumber(); break; case 2: printReversed(number); break; case 3: checkPalindrome(number); break; case 4: checkPrime(number); break; case 5: printPrimeFast(number); break; case 6: printPrimeSlow(number); break; case 7: printPrimeFactors(number); break; case 8: exit(0); break; default: printf("Your choice was invalid.\n Please choose a number from the list.\n"); main(); } } return 0; } int enterNewNumber(){ int n; printf("Please enter an int > 2:\n"); scanf("%d", &n); if(n<2){ printf("The int you entered was < 2.\n The int has been set equal to 2.\n"); n=2; return n; } return n; } void printReversed(int number) { int digit; int n = number; printf("This is your number: %d.\n", n); printf("This is your number reversed: "); while(n>0) { digit=n%10; printf("%d", digit); n=n/10; } printf("\n"); } void checkPalindrome(int number){ /*stuff*/ } int checkPrime(int number){ int n=number, den; for(den=2; den*den<=n; ++den){ if(n%den==0){ printf("Your number is not prime.\n It is divisible by %d.\n", den); return 1; } printf("Your number is prime.\n"); return 0; } void printPrimeFast(int number){ /*stuff*/ } void printPrimeSlow(int number){ /*stuff*/ } void printPrimeFactors(int number){ /*stuff*/ }

In case the numbers don't line up, the error message
(Assignment4b.c:102: error: expected declaration or statement at end of input
Assignment4b.c:102: warning: control reaches end of non-void function)

Apply to the last function. printPrimeFactors.

Again, please and thank you. These issues have been causing me alot of frustration.

When I inserted while(TRUE) it gave me an error saying that TRUE was undefined. Was that supposed to be while(true) ?