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#include
#include
int getOption (void);
void getData (int* num1, int* num2);
float calc (int option, int num1, int num2);
float add (int num1, int num2);
float sub (int num1, int num2);
float mul (int num1, int num2);
float divs (int num1, int num2);
void printData (int nun1, int num2, int option, float result);
int main (void)
{
int option;
int num1;
int num2;
float result;
option = getOption();
getData (&num1, &num2);
result = calc (option, num1, num2);
printData (num1, num2, option, result);
return 0;
}
int getOption (void)
{
int option;
printf("\t********************************");
printf("\n\t* MENU *");
printf("\n\t* *");
printf("\n\t* 1. ADD *");
printf("\n\t* 2. SUBTRACT *");
printf("\n\t* 3. MULTIPLY *");
printf("\n\t* 4. DIVIDE *");
printf("\n\t* *");
printf("\n\t********************************");
printf("\n\nPlease type your choice ");
printf("and key return：");
scanf ("%d", &option);
return option;
}
void getData (int* a, int* b)
{
printf("Please enter two integer numbers：");
scanf ("%d %d", a, b);
return;
}
float calc (int option, int num1, int num2)
{
float result;
switch(option)
{
case 1 : result = add (num1, num2);
break;
case 2 : result = sub (num1, num2);
break;
case 3 : result = mul (num1, num2);
break;
case 4 : if (num2 == 0.0)
{
printf("\n\a\aError：");
printf("division by zero\n");
exit (100);
}
else
result = divs (num1, num2);
break;
default: printf("\aOption not available\n");
exit (101);
}
return result;
}
float add (int a, int b)
{
float sum;
sum = a + b;
return sum;
}
float sub (int a, int b)
{
float dif;
dif = a - b;
return dif;
}
float mul (int a, int b)
{
float product;
product = a * b;
return product;
}
float divs (int a, int b)
{
float quotient;
quotient = (float)a / b;
return quotient;
}
void printData (int a, int b, int option, float result)
{
switch(option)
{
case 1 : printf("\n%d + %d = %.0f\n", a, b, result);
break;
case 2 : printf("\n%d - %d = %.0f\n", a, b, result);
break;
case 3 : printf("\n%d * %d = %.0f\n", a, b, result);
break;
case 4 : printf("\n%d / %d = %.2f\n", a, b, result);
break;
default: printf("\n\a\a未知錯誤！\n");
exit (102);
}
return;
}