Tegu on n\u00e4idega mille kommenteeritud lahendus toimub Programmeerimine 2 struktuuridele p\u00fchendatud tunnis.<\/p>\n
Andmefaili vorming: <nimi> <hinne><\/span> , kus nimi on maksimaalselt 63 t\u00e4hem\u00e4rki ja koosneb \u00fchest s\u00f5nast ning hinne on t\u00e4isarv. Andmev\u00e4ljad on eraldatud \u00fcksteisest t\u00fchikutega.<\/p>\n M\u00e4rka, et nimepuhvri \u00fclet\u00e4itumise eest kaitset rakendatud pole (st kui failis nime pikkus 64 v\u00f5i enam t\u00e4hem\u00e4rki, kirjutatakse \u00fcle massiivi piiride). See v\u00f5ib p\u00f5hjustada kas andmete riknemise v\u00f5i programmi kokkujooksu.<\/strong><\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Tegu on n\u00e4idega mille kommenteeritud lahendus toimub Programmeerimine 2 struktuuridele p\u00fchendatud tunnis. Andmefaili vorming: <nimi> <hinne> , kus nimi on maksimaalselt 63 t\u00e4hem\u00e4rki ja koosneb \u00fchest s\u00f5nast ning hinne on t\u00e4isarv. Andmev\u00e4ljad on eraldatud \u00fcksteisest t\u00fchikutega. M\u00e4rka, et nimepuhvri \u00fclet\u00e4itumise eest kaitset rakendatud pole (st kui failis nime pikkus 64 v\u00f5i enam t\u00e4hem\u00e4rki, kirjutatakse \u00fcle … Loe edasi Failist struktuurimassiivi lugemise n\u00e4ide<\/span> \/**\r\n * File: struct_file.c\r\n * Author: Risto Heinsar\r\n * Created: 10.01.2021\r\n * Last edit: 22.06.2026\r\n *\r\n * Description: Reads student data from a file into a struct array.\r\n * Name of the file passed as first argument\r\n *\r\n * Compile using --std=c99 or later.\r\n *\/\r\n#include <stdio.h>\r\n#include <stdlib.h>\r\n\r\n\/* 1 to enable printing debug statements, 0 to silence them *\/\r\n#define DEBUG 1\r\n\r\n\/* Predefined array limits *\/\r\n#define STR_MAX_LEN 64\r\n#define STUDENT_MAX_CNT 32\r\n\r\n\/* Options for command line args *\/\r\n#define ARGS_CNT 2\r\n\r\n#define ARGS_EXEC_NAME 0\r\n#define ARGS_FILE_NAME 1\r\n\r\nstruct Student\r\n{\r\n char name[STR_MAX_LEN];\r\n int grade;\r\n};\r\n\r\nint ReadData(char *fName, struct Student *students, int limit);\r\nvoid PrintData(struct Student *students, int cnt);\r\n\r\nint main(int argc, char **argv)\r\n{\r\n \/* Check that argument was passed*\/\r\n if (argc != ARGS_CNT)\r\n {\r\n fprintf(stderr, \"Usage: %s data_file\\n\", argv[ARGS_EXEC_NAME]);\r\n return EXIT_FAILURE;\r\n }\r\n\r\n \/* Create struct array *\/\r\n struct Student studentGrades[STUDENT_MAX_CNT];\r\n\r\n \/* Read student data from file *\/\r\n int studentCnt = ReadData(argv[ARGS_FILE_NAME], studentGrades, STUDENT_MAX_CNT);\r\n\r\n \/* Print student data *\/\r\n PrintData(studentGrades, studentCnt);\r\n\r\n return EXIT_SUCCESS;\r\n}\r\n\r\n\/**\r\n * Description: Reads student data from a file into a struct array\r\n *\r\n * Parameters: fileName - name of the file for input data\r\n * students - struct array to store the data\r\n * limit - maximum entries to read (struct array size)\r\n *\r\n * Return: Number of studens read from the file\r\n *\/\r\nint ReadData(char *fileName, struct Student *students, int limit)\r\n{\r\n FILE *fStudents = fopen(fileName, \"r\");\r\n if (fStudents == NULL)\r\n {\r\n \/* Prints custom message + system error message from errno to stderr *\/\r\n perror(\"Error! Cannot open input file\");\r\n\r\n \/* Returns 0 students read from the file, allows program to continue *\/\r\n return 0;\r\n }\r\n\r\n if (DEBUG) printf(\"Opened '%s' for reading student data\\n\", fileName);\r\n\r\n \/* Counter for number of students from file *\/\r\n int cnt = 0;\r\n\r\n while (fscanf(fStudents, \"%s %d\", students[cnt].name,\r\n &students[cnt].grade) == 2)\r\n {\r\n \/* Debugging print to check if input was read successfully *\/\r\n if (DEBUG)\r\n printf(\"DBG: from file (%d): %s %d\\n\", cnt + 1,\r\n students[cnt].name,\r\n students[cnt].grade);\r\n\r\n \/* Student successfully read, increment student count *\/\r\n cnt++;\r\n\r\n \/* Avoid overflowing the array *\/\r\n if (cnt >= limit)\r\n {\r\n fprintf(stderr, \"Error! File is too long! Allowed max is %d!\\n\"\r\n \"Reading of the file has been stopped, continuing \"\r\n \"with a partial dataset!\\n\", limit);\r\n break;\r\n }\r\n }\r\n\r\n \/* Close the input file *\/\r\n fclose(fStudents);\r\n\r\n if (DEBUG) printf(\"DBG: Reading finished, got %d entries\\n\", cnt);\r\n\r\n \/* Returns number of students read *\/\r\n return cnt;\r\n}\r\n\r\n\/**\r\n * Description: Prints the Student array contents\r\n *\r\n * Parameters: students - student data\r\n * cnt - num of students in data array\r\n *\r\n * Return: none\r\n *\/\r\nvoid PrintData(struct Student *students, int cnt)\r\n{\r\n \/* Handling of no students *\/\r\n if (cnt <= 0)\r\n {\r\n fprintf(stderr, \"Error! Student db is empty!\\n\");\r\n return;\r\n }\r\n\r\n printf(\"Student list contains %d students:\\n\", cnt);\r\n for (int i = 0; i < cnt; i++)\r\n {\r\n printf(\"%s %d\\n\", students[i].name, students[i].grade);\r\n }\r\n}\r\n<\/pre>\n