Time Calculator

 This is a time calculator made in C which is used to calculate, add or subtract time.

It currently supports only 24-hour clock and the support for 12-hour and time calculations from file are planned but depends if I stay invested in this little project.

 the file structure of this program :

Time Calculator/src/

    main.c # this is the main C file

    timec.h # this contains the definitions and implementations of the functions used in main.c

    timef.h # this files contains the functions used for operation on file

 Total lines of code :

           ---------------------------------------------------------------------------------------------------
            Language                     files          blank        comment           code
           ---------------------------------------------------------------------------------------------------
            C/C++ Header                     2             41             24                    334

            C                                            1              4               6                     46



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Time Calculator/src/timef.h (Time Calculator)

//This file contains function declaration and implementations for all file related functions like //opening file and parsing from file and fsize() that returns file size #include <stdlib.h> #include <stdio.h> #include <string.h> #define ERR_FILE_NOT_FOUND "The specified file is not found, please recheck the file name and path\n" #define ERR_CODE_FILE_NOT_FOUND 40 #define MAX_USERS_BYTE 251 typedef struct {     char id[26];     Time time; }User; int totalLines(FILE* file); int len(char* str); long fsize(FILE* file); char* removeSpaces(char* str,int length); int fileIt(int argc,char** argv); char* loadLine(FILE* file,int n); int countChars(char* str,char c); int totalUsers(FILE* file); User** parseUsers(FILE* file,int n); void parseUserTime(char* line,User** users,int totalUsers); void calcUserTime(FILE* file,User** users); int removeColon(char* str,int len); int len(char* str){     int counter = 0;     short ended = 0;     while(ended == 0){         if (str[c
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Time Calculator/src/timec.h (Time Calculator)

//This file contains function declarations and implementations for all non-file handling related functions //used by main.c #define USAGE "timec [OPTION] [ARGUMENT]... (The time is entered in 24-hour clock)\n" #define INVALID_OPTION "The option you provided is invalid, type \"timec -h\" for help\n" #define TIME_LENGTH 6 #define HELP "Enter \"typec -h\" for help\n" typedef struct {     int hour;     int minute; } Time; //parseTime() function is used to parse time from a string and put the parsed hour and minute //into the members of the provided Time struct using its pointer void    parseTime(char* str,Time* time); //putTime function is used to convert Time struc into a string void    putTime(char* str,Time* time); //calcDiffH() is used to calculate the difference between two given hours int     calcDiffH(Time* start,Time* end); //calcDiffM() is used to calculate the difference between two given minutes int     calcDiffM(Time* start,Time
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