利用c语言设计开发一个简单计算器,可进行加减乘除运算.

#include
#include
void add(float num1,float num2)
{
printf("num1 + num2 = %6.2f", num1 + num2);
}
void sub(float num1,float num2)
{
printf("num1 - num2 = %6.2f", num1 - num2);
}
void mul(float num1,float num2)
{
printf("num1 * num2 = %6.2f", num1 * num2);
}
void div(float num1,float num2)
{
printf("num1 / num2 = %6.2f", num1 / num2);
}
int main()
{
char a;
char *p = &a;
float num1;
float num2;
printf("please input you want to resultsn");
scanf("%f%c%f",&num1,p,&num2);
switch(*p)
{
case '+': add(num1,num2);
break;
case '-': sub(num1,num2);
break;
case '*': mul(num1,num2);
break;
case '/': div(num1,num2);
break;
default: system("pause");
}
return 0;
}