Update Chapter05.c

Author: rkgus24

Chapter05.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+
+int Add(int A, int B)
+{
+	return A + B;
+}
+
+int Sub(int A, int B)
+{
+	return A - B;
+}
+
+int Mul(int A, int B)
+{
+	return A * B;
+}
+
+int Div(int A, int B)
+{
+	return A / B;
+}
+
+void HowTo1(void)
+{
+	printf("사칙연산 프로그램입니다.\n");
+	printf("두 정수를 입력해주세요: ");
+}
+
+void HowTo2(void)
+{
+	printf("어떤 계산을 할까요?\n");
+	printf("1. 덧셈 2. 뺄셈 3. 곱셈 4. 나눗셈");
+}
+
+int ReadNum(void)
+{
+	int num;
+	scanf_s("%d", &num);
+	return num;
+}
+
+int main(void)
+{
+	int opt, result, num1, num2, A, B;
+	
+	HowTo1();
+
+	num1 = ReadNum();
+	num2 = ReadNum();
+
+	if (num1 > num2)
+	{
+		A = num1;
+		B = num2;
+	}
+	else
+	{
+		A = num2;
+		B = num1;
+	}
+
+	while (1)
+	{
+
+		HowTo2();
+		opt = ReadNum();
+
+		if (opt < 1 || opt>4)
+		{
+			printf("잘못된 숫자\n");
+			continue;
+		}
+		break;
+	}
+
+	switch (opt)
+	{
+	case 1:
+		printf("%d+%d=%d\n", A, B, Add(A, B));
+		break;
+	case 2:
+		printf("%d-%d=%d\n", A, B, Sub(A, B));
+		break;
+	case 3:
+		printf("%d*%d=%d\n", A, B, Mul(A, B));
+		break;
+	case 4:
+		printf("%d/%d=%d\n", A, B, Div(A, B));
+		break;
+	}
+	
+}