LinkBack URL
About LinkBacks
Introduction:Before I get started, this is an advance warning that I've never coded in C before. I've taken 2 years of java-related programming, but C is a brand new animal for me. This is for a class I'm currently taking, so I'd appreciate knowing the more basic ways of solving these problems rather than using new files or advanced work-around. That's how we learn, right?
Relavent information:
- I am using C-Free 5.0, and coding by C99 standards.
- There is one file read, which contains:
It is located at the root directory of the .c file.Code:12 196 295 394 493 592 689 788 790 879 877 978 986- I will update the provided code of my file/provided list as they change, and will ask a new question each time I do so until it's working. Please check the most recent questions, as previous ones may not apply to the new code.
The Program:Code:#include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdbool.h> int i;//Counter /** * Author Comments * Variables are defined throughout various functions or bracketed sections when they apply * only to that section. * */ /** * Function to reverse the order of a provided number. * Returns reversed number */ int reverseOrder(int number1) { int reversedNumber; char forwardsBuffer[32]; int length; char backwardsBuffer[32]; int counter1 = 0;//Counter for backwardsBuffer itoa(number1,forwardsBuffer,10); for (i=strlen(forwardsBuffer)-1; i--; i <=0) { backwardsBuffer[counter1] = forwardsBuffer[i]; counter1++; } itoa(reversedNumber,backwardsBuffer,10); return reversedNumber; } /** * Checks a number to see if it is a palendrome. Returns bool. */ bool checkPalendrome(int number2) { int first, last; bool returnValue = false;//One digit palendrome if (reverseOrder(number2) == number2)//3+ digit palendrome { returnValue = true; } return returnValue; } /** * Handles palendrome/reverse addition and itteration count */ int palendromeAddition(int number3) { int itterationCounter = 0; int reversedNumber; int summation; while (checkPalendrome(number3) != true) { reversedNumber = reverseOrder(number3); summation = number3 + reversedNumber; printf("%19d + %19d = %20d\n", number3, reversedNumber, summation); number3 = summation; // Repeats with new sum. itterationCounter++; } printf("A palendrome was obtained in %d itterations.\n\n", itterationCounter); } int main() { int sizeOfLychrelList; char fileName[256]; char nextLychrelChar[16]; char sizeOfLychrelListChar[16]; int n = 1; //Initial number to work with. Initializes as a nonzero. printf("Please input the candidate lychrel filename: "); gets(fileName); FILE *lychrelFile; if ((lychrelFile=fopen(fileName, "r")) == NULL) { //opens the file printf ("Error opening file\n"); exit (-1); } fgets(sizeOfLychrelListChar, 10, lychrelFile);//Gets the first number of the file and stores it as the number of lychrels sizeOfLychrelList = atoi(sizeOfLychrelListChar); int lychrels[sizeOfLychrelList];//Array that stores the lychrels /** * Generates an int list of all lychrels found within the file. * */ for(i=0; i++; i<sizeOfLychrelList) { fgets(nextLychrelChar,20,lychrelFile); lychrels[i] = atoi(nextLychrelChar); } i = 0;//Resets i for reuse later printf("Please input the value of N: "); scanf("%d", n); while(n != 0)// Entry of 0 will quit the program { while (n > lychrels[i] && n != lychrels[i] && i < sizeOfLychrelList)//Ensures that n is not a candidate lychrel { i++; } if (n == lychrels[i])//Checks if n is a Lychrel Candidate { printf("%d is a Candidate Lychrel.\n", n); } else if (i > sizeOfLychrelList)//Ensures that n is less than the maximum Lychrel Candidate supplied; otherwise n could be an unlisted lychrel and cause a crash. { printf("Supplied lychrel list limits exceeded, cannot process with certainty"); } else if (checkPalendrome(n)) { printf("%d is a palendrome.", n); } else { palendromeAddition(n); } printf("Please input the value of N: "); scanf("%d", n); i = 0; } printf ("\nGoodbye\n"); exit (-1); }Problems:Problem 1: Syntactically my program works, but it likes to break at line 63:
The error message is "Program stopped at 0x7539ecc0. It stopped with signal SIGSEGV, segmentation fault." Initially I had some run-ins with "segmentation faults" when setting up the reading process for the attached test file. I assume it has something to do with this?Code:summation = number3 + reversedNumber;
