diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2490a4d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.o
+/calc
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 4df6d6b..0000000
--- a/Makefile
+++ /dev/null
@@ -1,15 +0,0 @@
-SRCS = $(wildcard *.c)
-OBJS = $(SRCS:%.c=%.o)
-CFLAGS = -g -Wall
-TARGET = calc
-CC = gcc
-
-all: $(TARGET)
-
-$(TARGET): $(OBJS) 
-	$(CC) $(OUTPUT_OPTION) $(CFLAGS) $^
-
-clean:
-	$(RM) $(OBJS) $(TARGET)
-
-
diff --git a/README.md b/README.md
deleted file mode 100644
index 68b2d37..0000000
--- a/README.md
+++ /dev/null
@@ -1,16 +0,0 @@
-# Simple Calculator
-
-This is a buggy application that will be used for Lab5 of 'Introduction to Open Source Software Development.'
-
-  - Fork the project.
-  - Create a topic branch from master. 
-  - The branch name must be your student id. (e.g. 201624000)
-  - Make some commits to improve the project.
-    - Fix the well-knwon bugs.
-    - Remove object and binary files.
-    - Add .gitignore file
-  - Push this branch to your GitHub project.
-  - Open a Pull Request on GitHub.
-  - The Pull Request must be submitted to master branch of Classroom-IOSSD/SimpleCalculator!
-  - Capture the Pull Request and upload it to PLMS.
-
diff --git a/calc b/calc
deleted file mode 100755
index 023ec18..0000000
Binary files a/calc and /dev/null differ
diff --git a/calc.c b/calc.c
deleted file mode 100644
index 85f1466..0000000
--- a/calc.c
+++ /dev/null
@@ -1,35 +0,0 @@
-#include <stdio.h>
-#include "operators.h"
-
-int main(){
-	FILE *fp = NULL;
-	int operand1, operand2;
-	char operator = ' ';
-	int result, line = 0;
-
-	fp = fopen("read.txt","r");
-	if(fp!=NULL){
-		fscanf(fp, "%d", &line);
-	
-		for(int i=0; i<line; i++) {
-			fscanf(fp, "%d %c %d",&operand1, &operator, &operand2);
-			switch(operator) {
-				case '+':
-				result = add(operand1, operator);
-				break;
-				case '-':
-				result = minus(operand1, operator);
-				break;
-				case '*':
-				result = mul(operand1, operator);
-				case '/':
-				result = div(operand1, operator);
-				break;
-			}		
-			printf("%d %c %d = %d\n",
-				 operand1, operator, operand2, result);
-		}
-	}
-	return 0;
-}
-
diff --git a/calc.o b/calc.o
deleted file mode 100644
index e2bf1e7..0000000
Binary files a/calc.o and /dev/null differ
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..c9ed5ba
--- /dev/null
+++ b/main.c
@@ -0,0 +1,20 @@
+// main.c
+#include <stdio.h>
+#include <string.h>
+#include "my_fscanf.h"
+int main() {
+	FILE* fp = fopen("points.txt", "r");
+	char type[10];
+	double x, y;
+	int line;
+	if (fp != NULL) {
+		my_fscanf(fp, "%d", &line);
+		for (int i = 0; i < line; i++) {
+			my_fscanf(fp, "%s (%f,%f)", type, &x, &y);
+			if (strcmp(type, "point") == 0) {
+				printf("X: %f:, Y: %f\n", x, y);
+			}
+		}
+	}
+	return 0;
+}
\ No newline at end of file
diff --git a/my_fscanf.c b/my_fscanf.c
new file mode 100644
index 0000000..7949b0f
--- /dev/null
+++ b/my_fscanf.c
@@ -0,0 +1,91 @@
+// file: my_fscanf.c
+#include "my_fscanf.h"
+#include <stdarg.h>
+#include <ctype.h>
+void my_fscanf(FILE *fp, const char *format, ...) {
+	va_list list;
+	va_start(list, format);
+	while (*format) {
+		if (*format == '%') {		
+			int c;
+			format++;
+			switch (*format) {
+			case 'd':
+			{
+				while (isspace(c = getc(fp))) {}
+
+				int* addr = va_arg(list, int*);
+				*addr = 0;
+				while (isdigit(c)) {
+					*addr = *addr * 10 + c - '0';
+					c = getc(fp);
+				}
+
+				while (isspace(c = getc(fp))) {}
+
+				format++;
+				ungetc(c, fp);
+				break;
+			}
+			case 'c':
+			{
+				while (isspace(c = getc(fp))) {}
+
+				char* addr = va_arg(list, char*);
+				*addr = c;
+				format++;
+				break;
+			}
+			case 's':
+			{
+				char* addr = va_arg(list, char*);
+				int cnt = 1;
+				while (isspace(c = getc(fp))) {}
+
+				addr[0] = c;
+
+				while (!isspace(c = getc(fp))) {
+					addr[cnt] = c;
+					cnt++;
+				}
+				addr[cnt] = 0; //add null char
+				format++;
+				ungetc(c, fp);
+				break;
+			}
+			case 'f':
+			{
+				double* addr = va_arg(list, double*);
+				double decimalFraction = 0.1;
+
+				while (isspace(c = getc(fp))) {}
+				*addr = 0;
+				while (isdigit(c)) {
+					*addr = *addr * 10 + c - '0';
+					c = getc(fp);
+				}
+
+				if (c == '.') {
+					c = getc(fp);
+					while (isdigit(c)) {
+						*addr = *addr + (c - '0') * decimalFraction;
+						decimalFraction *= 0.1;
+						c = getc(fp);
+					}
+				}
+				format++;
+				ungetc(c, fp);
+				break;
+			}
+
+			}
+
+		}
+		else {
+			int c = getc(fp);
+			if (*format == c)
+				format++;
+		}
+	}
+	va_end(list);
+}
diff --git a/my_fscanf.h b/my_fscanf.h
new file mode 100644
index 0000000..19d4f40
--- /dev/null
+++ b/my_fscanf.h
@@ -0,0 +1,6 @@
+// file: my_fscanf.h
+#ifndef MY_FSCANF_H
+#define MY_FSCANF_H
+#include <stdio.h>
+void my_fscanf(FILE *fp, const char *format, ...);
+#endif /* !MY_FSCANF_H */
diff --git a/operators.c b/operators.c
deleted file mode 100644
index d51cb3e..0000000
--- a/operators.c
+++ /dev/null
@@ -1,16 +0,0 @@
-#include "operators.h"
-
-int add(int op1, int op2) {
-	return op1+op2;
-}
-int minus(int op1, int op2) {
-	return op1-op2;
-}
-int mul(int op1, int op2) {
-	return op1*op2;
-}
-
-int div(int op1, int op2) {
-	return op1%op2;
-}
-
diff --git a/operators.h b/operators.h
deleted file mode 100644
index bd08f7d..0000000
--- a/operators.h
+++ /dev/null
@@ -1,4 +0,0 @@
-int add(int op1, int op2);
-int mul(int op1, int op2);
-int div(int op1, int op2);
-int minus(int op1, int op2);
diff --git a/operators.o b/operators.o
deleted file mode 100644
index 71b996c..0000000
Binary files a/operators.o and /dev/null differ
diff --git a/points.txt b/points.txt
new file mode 100644
index 0000000..279a10c
--- /dev/null
+++ b/points.txt
@@ -0,0 +1,5 @@
+4
+point (1.3,2.2)
+point (2.5,3.0)
+point (3.2,4.4)
+point (1.0,5.9)
\ No newline at end of file
diff --git a/read.txt b/read.txt
deleted file mode 100644
index 3e2bf01..0000000
--- a/read.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-5
-123 + 456
-234 * 234
-143 - 111
-987 / 132