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POArray changing first value without explicitly modifying it when calling fscanf
primarykey
Id
7436622
data
AcceptedAnswerId
0
AnswerCount
3
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CommentCount
3
CommunityOwnedDate
CreationDate
2011-09-15T19:46:29.567
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0
LastActivityDate
2011-09-15T23:05:13.513
LastEditDate
2011-09-15T20:07:20.710
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285436
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285436
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1
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0
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206
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Body
I am reading a value from std in and storing it in an array <code>min[3]</code> and later on proceed to make an array comparison. So<code>min</code> is never touched before the comparison. After debugging, I noticed that <code>min[0]</code> changes from the input value to <code>\0</code> upon the executon of this line: <pre><code>fscanf(locDayFile, "%s", extractedHour); </code></pre> where <code>locDayFile</code> and <code>extractedHour</code> are declared as such: <pre><code>FILE* locDayFile; char extractedHour[3]; </code></pre> Any ideas on what is going wrong ? EDIT Here I am posting the code: <pre><code>#include <stdio.h> #include <stdlib.h> #include <dirent.h> #include <string.h> #include <math.h> struct coords{ float coord[3]; char station[5]; struct coords *next; }; void Add(struct coords**,char*, float*); float* Get(struct coords*, char*); int main(){ DIR *rootFolder, *subFolder; struct dirent *rootEnt, *subEnt; char rootFolderName[260], subFolderName[260]; FILE *locDayFile, *headers, *coordFile; FILE *stationDay, *yearDay, *time, *reference; char locDayFileName[260], headersFileName[260], coordFileName[260]; char stationDayName[260], yearDayName[260], timeName[260], referenceName[260]; char result[260]; char make[260]; char readLine[256]; char searchingFolderName[9], folderCmp[9]; char location[7], year[5], day[4], hour[3], min[3], referenceStation[5]; char locationTest[7], dayTest[4]; char extractedStation[5], extractedYear[5], extratedDay[4], extractedHour[3], extractedMin[3]; char rms[7]; float delay, refereDelay = 0; float *coordinates; char choice; printf("Please enter the following information:\n"); printf("Location: "); scanf("%s", location); memmove(location+1, location, 4); location[0] = 'o'; location[5] = 'a'; location[6] = '\0'; printf("Year: "); scanf("%s", year); printf("Day: "); scanf("%s", day); sprintf(searchingFolderName, "%s_%s", year, day); hour[0] = '\0'; min[0] = '\0'; referenceStation[0] = '\0'; referenceName[0] = '\0'; printf("Do you wish to enter the time?(Y/N): "); do{ scanf("%c", &choice); }while(choice != 'Y' && choice != 'y' && choice != 'N' && choice != 'n'); if(choice == 'Y' || choice == 'y'){ printf("Hour: "); scanf("%s", hour); printf("Minutes: "); scanf("%s", min); } printf("Do you wish to enter a reference station?(Y/N): "); do{ scanf("%c", &choice); }while(choice != 'Y' && choice != 'y' && choice != 'N' && choice != 'n'); if(choice == 'Y' || choice == 'y'){ printf("Reference station: "); scanf("%s", referenceStation); } printf("Root folder path: "); scanf("%s", rootFolderName); struct coords *c; c = NULL; printf("Coordinates file path: "); scanf("%s", coordFileName); coordFile = fopen(coordFileName, "r"); if(coordFile != NULL){ char st[5]; float coords[3]; while(!feof(coordFile)){ fscanf(coordFile, "%s", st); fscanf(coordFile, "%f", &coords[0]); fscanf(coordFile, "%f", &coords[1]); fscanf(coordFile, "%f", &coords[2]); Add(&c, st, coords); } } if((rootFolder = opendir(rootFolderName)) != NULL){ while((rootEnt = readdir(rootFolder)) != NULL){ sprintf(result, "%sresults/", rootFolderName); sprintf(make, "mkdir -p %s", result); system(make); folderCmp[0] = '\0'; strncpy(folderCmp, rootEnt->d_name, 8); folderCmp[8] = '\0'; if(strcmp(folderCmp, searchingFolderName) == 0){ sprintf(subFolderName, "%s%s/", rootFolderName, rootEnt->d_name); if((subFolder = opendir(subFolderName)) != NULL){ while((subEnt = readdir(subFolder)) != NULL){ strncpy(locationTest, subEnt->d_name, 6); locationTest[6] = '\0'; strncpy(dayTest, (subEnt->d_name)+7, 3); dayTest[3] = '\0'; if((strcmp(location, locationTest) == 0) && (strcmp(day, dayTest) == 0)){ sprintf(locDayFileName, "%s%s", subFolderName, subEnt->d_name); locDayFile = fopen(locDayFileName, "r"); while(!feof(locDayFile)){ char garbage[25]; fscanf(locDayFile, "%s", garbage); if(strcmp(garbage, "ATM_ZEN") == 0){ sprintf(headersFileName, "%sheaders_%s-%s", rootFolderName, year, day); headers = fopen(headersFileName, "a+"); fscanf(locDayFile, "%s", garbage); fscanf(locDayFile, "%s", extractedStation);//3rd column. fprintf(headers, "%s\t", extractedStation); fscanf(locDayFile, "%s", garbage); fscanf(locDayFile, "%s", extractedYear);//5th column. fprintf(headers, "%s\t", extractedYear); fscanf(locDayFile, "%s", garbage); fscanf(locDayFile, "%s", extratedDay);//7th column. fprintf(headers, "%s\t", extratedDay); fscanf(locDayFile, "%s", extractedHour);//8th column. fprintf(headers, "%s\t", extractedHour); fscanf(locDayFile, "%s", extractedMin);//9th column. fprintf(headers, "%s\t", extractedMin); fscanf(locDayFile, "%s", garbage); fscanf(locDayFile, "%s", garbage); fscanf(locDayFile, "%f", &delay);//12th column. fscanf(locDayFile, "%s", rms);//13 column. fprintf(headers, "%s\t", rms); fprintf(headers, "%f\n", delay); if(strcmp(referenceStation, extractedStation) == 0 && refereDelay == 0) refereDelay = delay; coordinates = Get(c, extractedStation); if(coordinates != NULL){ //station_day file sprintf(stationDayName, "%s%s_%s", result, extractedStation, extratedDay); stationDay = fopen(stationDayName, "a+"); fprintf(stationDay, "%s\t", extractedYear); fprintf(stationDay, "%s\t", extractedHour); fprintf(stationDay, "%s\t", extractedMin); fprintf(stationDay, "%f\t", coordinates[0]); fprintf(stationDay, "%f\t", coordinates[1]); fprintf(stationDay, "%f\t", coordinates[2]); fprintf(stationDay, "%s\t", rms); fprintf(stationDay, "%f\n", delay); fclose(stationDay); //year_day file sprintf(yearDayName, "%s%s_%s", result, extractedYear, extratedDay); yearDay = fopen(yearDayName, "a+"); fprintf(yearDay, "%s\t", extractedStation); fprintf(yearDay, "%s\t", extractedHour); fprintf(yearDay, "%s\t", extractedMin); fprintf(yearDay, "%f\t", coordinates[0]); fprintf(yearDay, "%f\t", coordinates[1]); fprintf(yearDay, "%f\t", coordinates[2]); fprintf(yearDay, "%s\t", rms); fprintf(yearDay, "%f\n", delay); fclose(yearDay); //year_day_hour_min file if((hour[0] != '\0' && (strcmp(hour, extractedHour) == 0)) && (min[0] != '\0' && (strcmp(min, extractedMin) == 0))){ sprintf(timeName , "%s_%s_%s", yearDayName, hour, min); time = fopen(timeName, "a+"); fprintf(time, "%s\t", extractedStation); fprintf(time, "%f\t", coordinates[0]); fprintf(time, "%f\t", coordinates[1]); fprintf(time, "%f\t", coordinates[2]); fprintf(time, "%s\t", rms); fprintf(time, "%f\n", delay); fclose(yearDay); } [.....] </code></pre>
Tags
<c><arrays><file-io><char><scanf>
Title
Array changing first value without explicitly modifying it when calling fscanf
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USFearUs
UserOwnerUserId
1. USFearUs
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

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