ЛР 6 правки

Лр 6/makefile

+BUILD_DIR=build
+SRC_DIR=src
+CC=gcc
+CFALGS=-Wall -g
+
+all: main1.elf main2.elf
+
+main1.elf: libstudents.so
+	$(CC) $(CFALGS) -lstudents -L ./$(BUILD_DIR)/ -o main1.elf $(SRC_DIR)/main1.c
+	echo export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$PWD"
+
+main2.elf: libstudents.so
+	$(CC) $(CFALGS) -lstudents -L ./$(BUILD_DIR)/ -o main2.elf $(SRC_DIR)/main2.c
+	echo export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$PWD"
+
+
+libstudents.so:
+	$(CC) $(CFALGS) -shared -fpic -o $(BUILD_DIR)/libstudents.so $(SRC_DIR)/students.c
+
+clean:
+	rm $(BUILD_DIR)/*o
+	rm main*.elf

Лр 6/src/main1.c

+#include <stdlib.h>
+
+#include "students.h"
+
+
+int
+main()
+{
+	int n;
+	printf("Enter the amount of students:");
+	scanf("%d", &n);
+	getchar();
+
+	struct Student *students = allocate_array(n);
+	
+	fill_array(n, students);
+	
+	FILE *file = NULL;
+	file = fopen("students.cvs", "a");
+	
+	write_array(file, n, students);
+		
+	fclose(file);
+	free(students);
+
+
+	puts("Students to read:");
+	scanf("%d",&n);
+	getchar();
+
+	if(n <= 0)
+		exit(0);
+
+
+	file = fopen("students.cvs","r");
+
+	if(!file){
+		puts("Could not open file!");
+		exit(0);
+	}
+
+	struct Student *students2 = read_file_to_array(file, n);
+
+	fclose(file);
+
+	puts("From file:");
+	print_array(n, students2);
+
+	free(students2);
+	return 0;
+}

Лр 6/src/main2.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "students.h"
+
+
+int
+main()
+{
+	int n;
+	printf("Enter the amount of students:");
+	scanf("%d", &n);
+	getchar();
+
+	struct Student *students = allocate_array(n);
+	
+	fill_array(n, students);
+	
+	FILE *file = NULL;
+	file = fopen("students.bin", "wb");
+	
+	bin_write_array(file, n, students);
+		
+	fclose(file);
+	free(students);
+
+
+	puts("Students to read:");
+	scanf("%d",&n);
+	getchar();
+
+	if(n <= 0)
+		exit(0);
+
+
+	file = fopen("students.bin","rb");
+
+	if(!file){
+		puts("Could not open file!");
+		exit(0);
+	}
+
+	struct Student *students2 = bin_read_file_to_array(file, n);
+
+	fclose(file);
+
+	puts("From file:");
+	print_array(n, students2);
+
+	free(students2);
+	return 0;
+}

Лр 6/src/students.c

+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+struct Student{
+	unsigned id;
+	char name[50];
+	char faculty[50];
+	float rating;
+};
+
+struct Student *
+allocate_array(int n){
+	struct Student *students = NULL;
+	students = malloc(sizeof(struct Student)*n);
+
+	if(!students)
+		exit(1);
+
+	return students;
+}
+
+void
+fill_array(int n, struct Student *students)
+{
+	for(int i = 0; i < n; i++){
+		printf("\nEnter student's № %d info:\n", i);
+
+		printf("\tid:");
+		scanf("%u", &students[i].id);
+		getchar();
+
+		printf("\tname:");
+		fgets(students[i].name, sizeof(students[i].name), stdin);
+		students[i].name[strcspn(students[i].name, "\n")] = 0; 
+
+		printf("\tfaculty:");
+		fgets(students[i].faculty, sizeof(students[i].faculty), stdin);
+		students[i].faculty[strcspn(students[i].faculty, "\n")] = 0; 
+
+		printf("\trating:");
+		scanf("%f", &students[i].rating);
+		getchar();
+	}
+}
+
+void
+write_array(FILE *file, int n, struct Student *students)
+{
+	for(int i = 0; i < n; i++){
+		fprintf(file, "%u,%s,%s,%f\n", students[i].id, students[i].name, students[i].faculty, students[i].rating);
+	}
+}
+
+void
+bin_write_array(FILE *file, int n, struct Student *students)
+{
+	fwrite(&students[0], sizeof(struct Student), n, file);
+}
+
+struct Student*
+bin_read_file_to_array(FILE *file, int n)
+{
+	struct Student *students = allocate_array(n);
+	fread(students, sizeof(struct Student), n, file);
+	return students;
+}
+
+struct Student *
+read_file_to_array( FILE *file, int n)
+{
+	char *buf = NULL;
+	buf = malloc(255);
+	struct Student *students = allocate_array(n);	
+
+	if(!buf)
+		exit(1);
+
+	char *tmp;
+
+	int i = 0;
+	while(fgets(buf, sizeof(struct Student), file) != NULL && i != n){
+		if ((strlen(buf)>0) && (buf[strlen (buf) - 1] == '\n'))
+			buf[strlen (buf) - 1] = '\0';
+
+		tmp = strtok(buf, ",");
+		students[i].id = atoi(tmp);
+
+		tmp = strtok(NULL, ",");
+		strcpy(students[i].name, tmp);
+
+		tmp = strtok(NULL, ",");
+		strcpy(students[i].faculty, tmp);
+
+		tmp = strtok(NULL, ",");
+		students[i].rating = atof(tmp);
+		i++;
+	}
+	free(buf);
+	return students;
+}
+
+void
+print_array(int n, struct Student *students)
+{
+	for(int i = 0; i < n; i++){
+		printf("Student №%d\n\tid:%u\n\tname:%s\n\tfaculty:%s\n\trating:%f\n", i, students[i].id, students[i].name, students[i].faculty, students[i].rating);
+	}
+}

Лр 6/src/students.h

+#ifndef STUDENTS_H
+#define STUDENTS_H
+
+#include <stdio.h>
+
+struct Student *allocate_array(int n);
+void fill_array(int n, struct Student *students);
+void print_array(int n,struct Student *students);
+
+void write_array(FILE *file, int n, struct Student *students);
+struct Student* read_file_to_array(FILE *file, int n);
+
+void bin_write_array(FILE *file,int n, struct Student *students);
+struct Student* bin_read_file_to_array(FILE *file, int n);
+
+#endif

Лр 6/students.cvs

+1,nig,ger,0.000000
+2,maxwel gaylord,travel,10.000000
+1,ni,ggdr,2.000000
+2,j,j,10.000000
+1,jf,fa,9.000000
+1,2,3,4.000000
+1,2,3e,4.000000