用C语言编写小功能计算器程序

#include <stdio.h>

void main()

{

float i,j

char ch

printf("*************************************\n")

printf("** This is a arithmetic calculator:**\n")

printf("*************************************\n")

while(1)

{ printf("input i,j:")

scanf("%f%f",&i,&j)

printf("input op:")

ch=getche()

printf("\n")

switch(ch)

{

case'+':

printf("%.4f+%.4f=%.4f\n",i,j,i+j)break

case'-':

printf("%.4f-%.4f=%.4f\n",i,j,i-j)break

case'*':

printf("%.4f*%.4f=%.4f\n",i,j,i*j)break

case'/':

{

if(j==0)

{

printf("error")

while(j>0)

{

printf("input i,j:")

scanf("%.4f%.4f",&i,&j)

}

}

else printf("%.4f/%.4f=%.4f\n",i,j,i/j)

break

}

}

}

}

你说的是 vc 还是 tc 啊？？？

其他的运算：

#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}

int (*func[])()={add,sub,mul,div}

int num,curch

char chtbl[]="+-*/()="

char corch[]="+-*/()=0123456789"

int getach() {

int i

while(1) {

curch=getchar()

if(curch==EOF) return -1

for(i=0corch[i]&&curch!=corch[i]i++)

if(i<strlen(corch)) break

}

return curch

}

int getid() {

int i

if(curch>='0'&&curch<='9') {

for(num=0curch>='0'&&curch<='9'getach())num=10*num+curch-'0'

return -1

}

else {

for(i=0chtbl[i]i++) if(chtbl[i]==curch) break

if(i<=5) getach()

return i

}

}

int cal() {

int x1,x2,x3,op1,op2,i

i=getid()

if(i==4)x1=cal() else x1=num

op1=getid()

if(op1>=5) return x1

i=getid()

if(i==4) x2=cal() else x2=num

op2=getid()

while(op2<=4) {

i=getid()

if(i==4) x3=cal() else x3=num

if((op1/2==0)&&(op2/2==1))x2=(*func[op2])(x2,x3)

else {

x1=(*func[op1])(x1,x2)

x2=x3

op1=op2

}

op2=getid()

}

return (*func[op1])(x1,x2)

}

void main(void) {

int value

printf("Please input an expression:\n")

getach()

while(curch!='=') {

value=cal()

printf("The result is:%d\n",value)

printf("Please input an expression:\n")

getach()

}

}

只能 + - * /

class Program

{

static void Main(string[] args)

{

calculator a = new calculator()

a.ADD(1, 2)

a.Minus(2, 1)

a.Multiply(2, 2)

a.Except(2, 2)

}

public class calculator

{

public int ADD(int a, int b)

{

return a + b

}

public int Minus(int a, int b)

{

return a - b

}

public int Multiply(int a, int b)

{

return a * b

}

public int Except(int a, int b)

{

return a / b

}

}

}

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