本文目录一览:
- c语言模拟简单计算,无优先级,只计算加减乘除,输入没有空格
- C语言模拟计算器的功能,要求至少能实现基本四则运算(加减乘除功能),要求提示明确.能用/*说明代码意思最好
- c语言模拟计算器四则混合运算
- C语言 设计一个 模拟计算器程序
c语言模拟简单计算,无优先级,只计算加减乘除,输入没有空格
#include<stdio.h>
#include<stdlib.h>
int main()
{
float a,b;
int oper;
printf("请输入a,b两个数\n");
scanf("%f %f",&a,&b);
printf("请输入对应的 + - * /符号,对应的是1234\n");
scanf("%d",&oper);
float c1=a+b,c2=a-b,c3=a*b,c4=a/b;
switch(oper)
{
case 1: printf("%f\n",c1);break;
case 2: printf("%f\n",c2);break;
case 3: printf("%f\n",c3);break;
case 4:
if(b==0)
{
printf("除数为0,不可进行运算\n");
exit(-1);
}
printf("%f\n",c4);break;
}
return 0;
}
C语言模拟计算器的功能,要求至少能实现基本四则运算(加减乘除功能),要求提示明确.能用/*说明代码意思最好
#include<iostream>
using namespace std;
int main()
{
int a,b; // a是输出结果,b是临时输入数据
char x; // x是标点符号输入
cin >> a; // 先输入第一个数
while(1) // 由于不知道运算式一共多长,所以用一个死循环不断读取
{
cin >> x; // 输入运算符
if(x == '=') break; // 如果输入的是等号,则结束循环
cin >> b; // 输入第二个数
switch(x)
{
case '+': a += b; break;
case '-': a -= b; break;
case '*': a *= b; break;
case '/':
if(b == 0)
{
cout << "除数不能为0" << endl;
return -1;
}
a /= b;
break;
default:
cout << "输入的运算符错误" << endl;
return -1;
}
}
cout << "结果为:" << a << endl;
return 0;
}
c语言模拟计算器四则混合运算
// 此算法只能进行整数四则混合运算,也不支持括号
// 按下面的格式输入表达式(末尾无=)
// 10-5+4+6/2*14*8/4-5*7+2-4*6/2-10*4-6/3
#include<stdio.h>
int jisuan(int num1, char op1, int num2)
{
switch(op1)
{
case '*': return num1*num2;
case '/': return num1/num2;
case '+': return num1+num2;
case '-': return num1-num2;
}
}
int process(int num1, char op1, int num2)
{
int r, num3;
char op2;
if('\n' != (op2 = getchar()))
{
scanf("%d", &num3);
if('+' == op2 || '-' == op2)
{
num1 = jisuan(num1, op1, num2);
r = process(num1, op2, num3);
}
else if('*' == op2 || '/' == op2)
{
if('/' == op1)
{
num1 = jisuan(num1, op1, num2);
r = process(num1, op2, num3);
}
else
{
num2 = jisuan(num2, op2, num3);
r = process(num1, op1, num2);
}
}
}
else
{
r = jisuan(num1, op1, num2);
}
return r;
}
int main()
{
int num1, num2;
char op;
printf("请输入一个表达式:");
scanf("%d%c%d", &num1, &op, &num2);
printf("=%d\n", process(num1, op, num2));
return 0;
}
C语言 设计一个 模拟计算器程序
#include <dos.h> /*DOS接口函数*/
#include <math.h> /*数学函数的定义*/
#include <conio.h> /*屏幕操作函数*/
#include <stdio.h> /*I/O函数*/
#include <stdlib.h> /*库函数*/
#include <stdarg.h> /*变量长度参数表*/
#include <graphics.h> /*图形函数*/
#include <string.h> /*字符串函数*/
#include <ctype.h> /*字符操作函数*/
#define UP 0x48 /*光标上移键*/
#define DOWN 0x50 /*光标下移键*/
#define LEFT 0x4b /*光标左移键*/
#define RIGHT 0x4d /*光标右移键*/
#define ENTER 0x0d /*回车键*/
void *rar; /*全局变量,保存光标图象*/
struct palettetype palette; /*使用调色板信息*/
int GraphDriver; /* 图形设备驱动*/
int GraphMode; /* 图形模式值*/
int ErrorCode; /* 错误代码*/
int MaxColors; /* 可用颜色的最大数值*/
int MaxX, MaxY; /* 屏幕的最大分辨率*/
double AspectRatio; /* 屏幕的像素比*/
void drawboder(void); /*画边框函数*/
void initialize(void); /*初始化函数*/
void computer(void); /*计算器计算函数*/
void changetextstyle(int font, int direction, int charsize); /*改变文本样式函数*/
void mwindow(char *header); /*窗口函数*/
int specialkey(void); /*获取特殊键函数*/
int arrow(); /*设置箭头光标函数*/
/*主函数*/
int main()
{
initialize(); /* 设置系统进入图形模式 */
computer(); /*运行计算器 */
closegraph(); /*系统关闭图形模式返回文本模式*/
return(0); /*结束程序*/
}
/* 设置系统进入图形模式 */
void initialize(void)
{
int xasp, yasp; /* 用于读x和y方向纵横比*/
GraphDriver = DETECT; /* 自动检测显示器*/
initgraph(&GraphDriver, &GraphMode, "");
/*初始化图形系统*/
ErrorCode = graphresult(); /*读初始化结果*/
if( ErrorCode != grOk ) /*如果初始化时出现错误*/
{
printf("Graphics System Error: %s\n", grapherrormsg( ErrorCode ));
exit( 1 );
}
getpalette( palette ); /* 读面板信息*/
MaxColors = getmaxcolor() + 1; /* 读取颜色的最大值*/
MaxX = getmaxx(); /* 读屏幕尺寸 */
MaxY = getmaxy(); /* 读屏幕尺寸 */
getaspectratio( &xasp, &yasp ); /* 拷贝纵横比到变量中*/
AspectRatio = (double)xasp/(double)yasp; /* 计算纵横比值*/
}
/*计算器函数*/
void computer(void)
{
struct viewporttype vp;
int color, height, width;
int x, y, x0, y0, i, j, v, m, n, act, flag=1;
float num1=0, num2=0, result;
char cnum[5], str2[20]={""}, c, temp[20]={""};
char str1[]="1230.456+-789*/Qc=^%";
mwindow( "Calculator" );
color = 7;
getviewsettings( &vp );
width=(vp.right+1)/10;
height=(vp.bottom-10)/10;
x = width /2;
y = height/2;
setfillstyle(SOLID_FILL, color+3);
bar( x+width*2, y, x+7*width, y+height );
setcolor( color+3 );
rectangle( x+width*2, y, x+7*width, y+height );
setcolor(RED);
outtextxy(x+3*width,y+height/2,"0.");
x =2*width-width/2;
y =2*height+height/2;
for( j=0 ; j<4 ; ++j )
{
for( i=0 ; i<5 ; ++i )
{
setfillstyle(SOLID_FILL, color);
setcolor(RED);
bar( x, y, x+width, y+height );
rectangle( x, y, x+width, y+height );
sprintf(str2,"%c",str1[j*5+i]);
outtextxy( x+(width/2), y+height/2, str2);
x =x+width+ (width / 2) ;
}
y +=(height/2)*3;
x =2*width-width/2;
}
x0=2*width;
y0=3*height;
x=x0;
y=y0;
gotoxy(x,y);
arrow();
putimage(x,y,rar,XOR_PUT);
m=0;
n=0;
strcpy(str2,"");
while((v=specialkey())!=45)
{
while((v=specialkey())!=ENTER)
{
putimage(x,y,rar,XOR_PUT);
if(v==RIGHT)
{
if(x==x0+6*width)
{
x=x0;
m=0;
}
else
{
x=x+width+width/2;
m++;
}
}
if(v==LEFT)
{
if(x==x0)
{
x=x0+6*width;
m=4;
}
else
{
x=x-width-width/2;
m--;
}
}
if(v==UP)
{
if(y==y0)
{
y=y0+4*height+height/2;
n=3;
}
else
{
y=y-height-height/2;
n--;
}
}
if(v==DOWN)
{
if(y==7*height)
{
y=y0;
n=0;
}
else
{
y=y+height+height/2;
n++;
}
}
putimage(x,y,rar,XOR_PUT);
}
c=str1[n*5+m];
if(isdigit(c)||c=='.')
{
if(flag==-1)
{
strcpy(str2,"-");
flag=1;
}
sprintf(temp,"%c",c);
strcat(str2,temp);
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,str2);
}
if(c=='+')
{
num1=atof(str2);
strcpy(str2,"");
act=1;
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
if(c=='-')
{
if(strcmp(str2,"")==0)
flag=-1;
else
{
num1=atof(str2);
strcpy(str2,"");
act=2;
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
}
if(c=='*')
{
num1=atof(str2);
strcpy(str2,"");
act=3;
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
if(c=='/')
{
num1=atof(str2);
strcpy(str2,"");
act=4;
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
if(c=='^')
{
num1=atof(str2);
strcpy(str2,"");
act=5;
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
if(c=='%')
{
num1=atof(str2);
strcpy(str2,"");
act=6;
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
if(c=='=')
{
num2=atof(str2);
switch(act)
{
case 1:result=num1+num2;break;
case 2:result=num1-num2;break;
case 3:result=num1*num2;break;
case 4:result=num1/num2;break;
case 5:result=pow(num1,num2);break;
case 6:result=fmod(num1,num2);break;
}
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
sprintf(temp,"%f",result);
outtextxy(5*width,height,temp);
}
if(c=='c')
{
num1=0;
num2=0;
flag=1;
strcpy(str2,"");
setfillstyle(SOLID_FILL,color+3);
bar(2*width+width/2,height/2,15*width/2,3*height/2);
outtextxy(5*width,height,"0.");
}
if(c=='Q') exit(0);
}
putimage(x,y,rar,XOR_PUT);
return;
}
/*窗口函数*/
void mwindow( char *header )
{
int height;
cleardevice();
setcolor( MaxColors - 1 );
setviewport( 20, 20, MaxX/2, MaxY/2, 1 );
height = textheight( "H" );
settextstyle( DEFAULT_FONT, HORIZ_DIR, 1 );
settextjustify( CENTER_TEXT, TOP_TEXT );
outtextxy( MaxX/4, 2, header );
setviewport( 20,20+height+4, MaxX/2+4, MaxY/2+20, 1 );
drawboder();
}
void drawboder(void)
{
struct viewporttype vp;
setcolor( MaxColors - 1 );
setlinestyle( SOLID_LINE, 0, NORM_WIDTH );
getviewsettings( &vp );
rectangle( 0, 0, vp.right-vp.left, vp.bottom-vp.top );
}
/*设计鼠标图形函数*/
int arrow()
{
int size;
int raw[]={4,4,4,8,6,8,14,16,16,16,8,6,8,4,4,4};
setfillstyle(SOLID_FILL,2);
fillpoly(8,raw);
size=imagesize(4,4,16,16);
rar=malloc(size);
getimage(4,4,16,16,rar);
putimage(4,4,rar,XOR_PUT);
return 0;
}
/*按键函数*/
int specialkey(void)
{
int key;
while(bioskey(1)==0);
key=bioskey(0);
key=key&0xff ? key&0xff : key>>8;
return(key);
}