diff --git a/calc.c b/calc.c
old mode 100644
new mode 100755
index 85f1466..1b0d10f
--- a/calc.c
+++ b/calc.c
@@ -5,28 +5,29 @@ int main(){
 	FILE *fp = NULL;
 	int operand1, operand2;
 	char operator = ' ';
-	int result, line = 0;
+	double result, line = 0;
 
 	fp = fopen("read.txt","r");
 	if(fp!=NULL){
-		fscanf(fp, "%d", &line);
+		my_fscanf(fp, "%d", &line);
 	
-		for(int i=0; i<line; i++) {
-			fscanf(fp, "%d %c %d",&operand1, &operator, &operand2);
+		for(int i=0; i<line && !feof(fp); i++) {
+		    my_fscanf(fp, "%d %c %d",&operand1, &operator, &operand2);
 			switch(operator) {
 				case '+':
-				result = add(operand1, operator);
+				result = add(operand1, operand2);
 				break;
 				case '-':
-				result = minus(operand1, operator);
+				result = minus(operand1, operand2);
 				break;
 				case '*':
-				result = mul(operand1, operator);
+				result = mul(operand1, operand2);
+				break;
 				case '/':
 				result = div(operand1, operator);
 				break;
 			}		
-			printf("%d %c %d = %d\n",
+			printf("%d %c %d = %f\n",
 				 operand1, operator, operand2, result);
 		}
 	}
diff --git a/lab_14.tar b/lab_14.tar
new file mode 100644
index 0000000..55687c7
Binary files /dev/null and b/lab_14.tar differ
diff --git a/my_fscanf.c b/my_fscanf.c
new file mode 100755
index 0000000..179a791
--- /dev/null
+++ b/my_fscanf.c
@@ -0,0 +1,52 @@
+#include "my_fscanf.h"
+#include <stdarg.h>
+#include <ctype.h>
+
+void my_fscanf(FILE* fp, const char* format, ...){
+  va_list list;			//가변 인자 목록 포인터
+  int dtemp=0;
+  char temp;
+  char ctemp= ' ';
+  va_start(list, format);
+
+  while(*format){
+	if(*format == '%'){
+	  format++;
+	  switch(*format){
+		case 'd':
+			while(isspace(temp)){
+			//empty
+			}
+			while(isdigit(temp)){
+				dtemp = temp;
+				temp = getc(fp);
+			}
+			dtemp = va_arg(list, int);
+			dtemp = 0;
+			format++;
+			break;
+
+		case 'c':
+			while(isspace(temp)){
+			//empty
+			}
+		  	while(isgraph(temp)){
+				ctemp =temp;
+				temp = getc(fp);
+			}
+			ctemp = va_arg(list, char);
+			format++;
+			break;
+		default break;
+		}
+  }
+  else if(isspace(*format)){
+		format++;
+	}
+  }
+  va_end(list);
+}
+			
+
+
+
diff --git a/my_fscanf.h b/my_fscanf.h
new file mode 100755
index 0000000..9ed3568
--- /dev/null
+++ b/my_fscanf.h
@@ -0,0 +1,7 @@
+#ifdef 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
old mode 100644
new mode 100755
index d51cb3e..34999cd
--- a/operators.c
+++ b/operators.c
@@ -1,16 +1,16 @@
 #include "operators.h"
 
-int add(int op1, int op2) {
+double add(double op1, double op2) {
 	return op1+op2;
 }
-int minus(int op1, int op2) {
+double minus(double op1, double op2) {
 	return op1-op2;
 }
-int mul(int op1, int op2) {
+double mul(double op1, double op2) {
 	return op1*op2;
 }
 
-int div(int op1, int op2) {
-	return op1%op2;
+double div(double op1, double op2) {
+	return op1/op2;
 }
 
diff --git a/operators.h b/operators.h
old mode 100644
new mode 100755
index bd08f7d..0172ff3
--- a/operators.h
+++ b/operators.h
@@ -1,4 +1,4 @@
-int add(int op1, int op2);
-int mul(int op1, int op2);
-int div(int op1, int op2);
-int minus(int op1, int op2);
+double add(double op1, double op2);
+double mul(double op1, double op2);
+double div(double op1, double op2);
+double minus(double op1, double op2);