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POSegmentation fault error - C programming
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5723323
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2011-04-19T22:09:20.660
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2011-04-20T00:15:36.460
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2011-04-19T22:13:34.983
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716076
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1
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0
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560
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text
Body
<p>I am receiving a Segmentation Fault error when I run this program. To summarize, the program reads in multiple data files (129 of them). Each file contains information about a specific name. The information includes how many people were named a specific name in a specific year and the gender. For now, I am trying to store each name in a linked list. Whenever I read in more than about 4 data files, I get the Segmentation Fault error. I have written this program in Java, which was much simpler. If anybody could simply point me in the right direction, as I am almost certain this has to do with memory allocation, but I cannot seem to solve this myself. Thank you.</p> <pre><code>#include <iostream> #include <fstream> #include <stdio.h> #include <string.h> #include <cstdlib> using namespace std; //typedef struct Node NodeStruct; struct Node { char *namePtr; Node *nextPtr; }; int main() { // Declare variables Node *headPtr = NULL; Node *tempPtr; Node *currentPtr; // Variables for reading in a file FILE *filePtr; char fileName[20]; int i; int nameLength; char inputLine[81]; cout << "Reading from data files, please be patient...\n"; // Loop through files for (i = 1880; i <= 2009; i++) { sprintf(fileName, "data/yob%d.txt", i); filePtr = fopen(fileName, "r"); // Open the file // Check to ensure file was opened if(filePtr == NULL) { cout << "Error opening input file...check location of data files\n"; exit(-1); // Exit program } // End if statement while (fscanf(filePtr, "%s", inputLine) != EOF) { // Create a node tempPtr = (Node *) malloc(sizeof(Node)); tempPtr->nextPtr = NULL; // Set the head pointer of first node if (headPtr == NULL) { headPtr = tempPtr; currentPtr = tempPtr; } // End if statement // Link the list currentPtr->nextPtr = tempPtr; currentPtr = currentPtr->nextPtr; // Create pointer variables char *startPtr = inputLine; char *endPtr = NULL; endPtr = strchr(inputLine, ','); // Point to end of name int length = endPtr - inputLine; // Calculate length // Create space for the name tempPtr->namePtr = (char *) malloc(sizeof(length + 1)); strncpy(tempPtr->namePtr, startPtr, length); // Store pointer to name // cout << tempPtr->namePtr << endl; } } // End of for (i = 1880... cout << "Done reading from data files...\n"; } // End of main function </code></pre>
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Segmentation fault error - C programming
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