留念 C语言第一课简单的计算器制作

学C语言这么久了。  /* 留念 C语言第一课简单的计算器制作 */ 

 #include<stdio.h>  #include<stdlib.h>

#include<conio.h>

void displayMenu(); /*赵存档做*/

void add();

void sub();

void multiply();

void divide();

void yushu();

void jiecheng();

void leijia();

void jiechengleijia();

int main(int n)

{do

{system("color 2e");

system("cls");

displayMenu();

system("pause");}

while(n);}

int n;

void displayMenu()

{ printf("***welcome to use simple calculator***\n");

printf("the author is xiaobo\n");

printf("No.1 add\n");

printf("No.2 sub\n");

printf("No.3 multiply\n");

printf("No.4 divide\n");

printf("No.5 yushu\n");

printf("No.6 jiecheng\n");

printf("No.7 liejia\n");

printf("No.8 jiechengleijia\n");

printf("No.0 exit\n");

scanf("%d",&n);

switch(n)

{ case 1:add(); break;

case 2:sub(); break;

case 3:multiply(); break;

case 4:divide(); break;

case 5:yushu(); break;

case 6:jiecheng(); break;

case 7:leijia(); break;

case 8:jiechengleijia();break;

case 0:exit(0);return;}

}

void add()

{ double num1,num2;

double sum;

printf("Please Input 2 numbers to add\n");

scanf("%lg%lg",&num1,&num2);

sum =num1+num2;

printf("sum is %lg\n",sum);}

void sub()

{ double num1,num2;

double sum;

printf("Please Input 2 numbers to sub\n");

scanf("%lg%lg",&num1,&num2);

sum =num1-num2;

printf("the result is %lg\n",sum);}

void multiply()

{ double num1,num2;

double sum;

printf("Please Input 2 numbers to multiply\n");

scanf("%lg%lg",&num1,&num2);

sum =num1*num2;

printf("the result is %lg\n",sum);}

void divide()

{ double num1,num2;

double sum;

printf("Please Input 2 numbers to divide\n");

scanf("%lg%lg",&num1,&num2);

sum =num1/num2;

printf("the result is %lg\n",sum);}

//http://www.cnblogs.com/xiaobo-Linux/ QQ463431476

void yushu()

{int num1,num2;

int sum;

printf("please Input 2 numbers for yushu\n");

scanf("%ld",&num1,&num2);

sum =num1%num2;

printf("yushu is %ld\n",sum);

}

void jiecheng()

{double i,j=1;

double sum=1;

printf("Please Input a integer number for jiecheng\n");

scanf("%lg",&i);

for(;j<i;j++)

{sum *=j;}

sum *=i;

printf("the result is %lg\n",sum);}

void leijia()

{double n;

double sum=0;

printf("please input any number more than 0, with less than 0 number to end\n");

for(n=0;n>=0;)

{sum +=n;

scanf("%lg",&n);}

printf("the result is %lg\n",sum); }

void jiechengleijia()

{ int i,a[5];

long j,k=1,sum=0;

printf("please input any 5 integer numbers\n");

for(i=0;i<5;i++)

{scanf("%d",&a[i]);

for(j=a[i];j>=1;j--)

{k =k*j;}

sum +=k;

k=1;}

printf("\nthe sum is %ld\n",sum); }

/* 2014 /12. 25赵存档 QQ463431476 做 */