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C语言简易计算器的两种方法_编程小白的技术博客_51CTO博客

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source link: https://blog.51cto.com/u_15922371/5986917
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C语言简易计算器的两种方法

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海绵饱饱q 2023-01-03 23:24:54 博主文章分类：C语言 ©著作权

文章标签 #include 数组元素 数据 文章分类 C/C++ 编程语言 yyds干货盘点 阅读数186

第一种方法   函数指针数组

#include<stdio.h>
int add(int x,int y)
{
    return x+y;
}

int sub(int x,int y)
{
    return x-y;
}

int mul(int x,int y)
{
    return x*y;
}

int div(int x,int y)
{
    return x/y;
}

void menu()
{
    printf("*****************\n");
    printf("**1.add   2.sub**\n");
    printf("**3.mul   4.div**\n");
    printf("*****0.exit******\n");
}

int main()
{
    int x=0;
    int y=0;
    int input=0;
    int (*pf[5])(int,int)={0,add,sub,mul,div};//数组元素个数可以不写

do
    {
        menu();
    printf("请输入:>\n");
        scanf("%d",&input);
        if(input>=1 && input<=4)
        {
            printf("请输入数据:>\n");
            scanf("%d%d",&x,&y);
            printf("%d\n",pf[input](x,y));

}

else if(input==0)
        {
            printf("退出\n");
            break;
        }

else
        {
            printf("输入错误\n");
            break;
        }
    }while(input);
    return 0;
}
第二种方法   switch case语句
#include<stdio.h>
int add(int x,int y)
{
  return x+y;
}

int sub(int x,int y)
{
  return x-y;
}

int mul(int x,int y)
{
  return x*y;
}

int div(int x,int y)
{
  return x/y;
}

void menu()
{
  printf("*****************\n");
  printf("**1.add   2.sub**\n");
  printf("**3.mul   4.div**\n");
  printf("*****0.exit******\n");
}

void calc(int (*pf)(int,int))
{
  int x=0;
  int y=0;
  printf("请输入:>");
  scanf("%d%d",&x,&y);
  printf("%d\n",pf(x,y));
}

int main()
{
  int x=0;
  int y=0;
  int input=0;
  do
  {
    menu();
    printf("请输入:>");
    scanf("%d",&input);
    switch(input)
    {
      case 1:
        calc(add);
        break;
      case 2:
        calc(sub);
        break;
      case 3:
        calc(mul);
        break;
      case 4:
        calc(div);
        break;
      case 0:
        printf("退出\n");
        break;
      default:
        printf("输入错误，请重新输入\n");
        break;
    }
  }while(input);
}

            

        
        
        
    

    

        
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