C++ 计算器程序
计算器是一种便携式设备，可以帮助我们在日常生活中执行简单的 Math 计算，例如加，减，除，乘一些科学的计算器可以更轻松地执行复杂的计算，例如平方根，函数，指数运算，对数，三角函数和双曲线函数等。在本节中，我们将在C++使用函数和do-while循环。
使用函数
让 C++ 中使用 函数 和 切换 语句。
#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
void add();
void sub();
void multi();
void division();
void sqr();
void srt();
void exit();
void main()
{
clrscr();
int opr;
// display different operation of the calculator
do
{
cout << "Select any operation from the C++ Calculator"
"\n1 = Addition"
"\n2 = Subtraction"
"\n3 = Multiplication"
"\n4 = Division"
"\n5 = Square"
"\n6 = Square Root"
"\n7 = Exit"
"\n \n Make a choice: ";
cin >> opr;
switch (opr)
{
case 1:
add(); // call add() function to find the Addition
break;
case 2:
sub(); // call sub() function to find the subtraction
break;
case 3:
multi(); // call multi() function to find the multiplication
break;
case 4:
division(); // call division() function to find the division
break;
case 5:
sqr(); // call sqr() function to find the square of a number
break;
case 6:
srt(); // call srt() function to find the Square Root of the given number
break;
case 7:
exit(0); // terminate the program
break;
default:
cout <<"Something is wrong..!!";
break;
}
cout <<" \n------------------------------\n";
}while(opr != 7);
getch();
}
void add()
{
int n, sum = 0, i, number;
cout <<"How many numbers you want to add: ";
cin >> n;
cout << "Please enter the number one by one: \n";
for (i = 1; i <= n; i++)
{
cin >> number;
sum = sum + number;
}
cout << "\n Sum of the numbers = "<< sum;
}
void sub()
{
int num1, num2, z;
cout <<" \n Enter the First number = ";
cin >> num1;
cout << "\n Enter the Second number = ";
cin >> num2;
z = num1-num2;
cout <<"\n Subtraction of the number = " << z;
}
void multi()
{
int num1, num2, mul;
cout <<" \n Enter the First number = ";
cin >> num1;
cout << "\n Enter the Second number = ";
cin >> num2;
mul = num1 * num2;
cout <<"\n Multiplication of two numbers = " << mul;
}
void division()
{
int num1, num2, div = 0;
cout <<" \n Enter the First number = ";
cin >> num1;
cout << "\n Enter the Second number = ";
cin >> num2;
while ( num2 == 0)
{
cout << "\n Divisor canot be zero"
"\n Please enter the divisor once again: ";
cin >> num2;
}
div = num1 / num2;
cout <<"\n Division of two numbers = " << div;
}
void sqr()
{
int num1;
float sq;
cout <<" \n Enter a number to find the Square: ";
cin >> num1;
sq = num1 * num1;
cout <<" \n Square of " << num1<< " is : "<< sq;
}
void srt()
{
float q;
int num1;
cout << "\n Enter the number to find the Square Root:";
cin >> num1;
q = sqrt(num1);
cout <<" \n Square Root of " << num1<< " is : "<< q;
}
输出:
使用do-while循环
使用 执行时间 和切换语句。
#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
clrscr();
int opr;
int num1, num2, x;
// display different operation of the calculator
do
{
cout << "Select an operation to perform a simple calculation in C++ Calculator"
"\n1 = Addition"
"\n2 = Subtraction"
"\n3 = Multiplication"
"\n4 = Division"
"\n5 = Square"
"\n6 = Exit"
"\n \n Make a choice: ";
cin >> opr;
switch (opr)
{
// for addition operation in calculator
case 1:
cout << "You have selected the Addition Operation.";
cout << "\n Please enter the two number: \n";
cin >> num1 >> num2;
x = num1 + num2;
cout << "Sum of two number = " << x;
break;
// for subtraction operation in calculator
case 2:
cout << "You have selected the Subtraction Operation.";
cout << "\n Please enter the two number: \n";
cin >> num1 >> num2;
x = num1-num2;
cout << "Subtraction of two number = " << x;
break;
// for multiplication operation in calculator
case 3:
cout << "You have selected the Multiplication Operation.";
cout << "\n Please enter the two number: \n";
cin >> num1 >> num2;
x = num1 * num2;
cout << "Product of two number = " << x;
break;
// for division operation in calculator
case 4:
cout << "You have selected the Division Operation.";
cout << "\n Please enter the two number; \n";
cin >> num1 >> num2;
// while loop checks for divisor whether it is zero
while ( num2 == 0)
{
cout << "\n Divisor cannot be zero"
"\n Please enter the divisor once again: ";
cin >> num2;
}
x = num1 / num2;
cout << "\n Quotient = " << x;
break;
// to square a number in calculator
case 5:
cout << "You have selected the Square Operation.";
cout << "\n Please enter any number: \n";
cin >> num1;
x = num1 * num1;
cout << "Square is = " << x;
break;
case 6: exit(0); // terminate the program
break;
default: cout << "\n Something went wrong..!!";
break;
}
cout << "\n-----------------------------------------\n";
} while(opr != 6);
getch();
}
输出:
