This post will create a simple calculator in C++. The first one use signs for deciding the operation and the next one uses characters for deciding the operation. You can further extend it and create a Scientific Calculator. Go enjoy the program. Lets begin……………

Program to create a Calculator

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#include<iostream> using namespace std; int main() { int a,c,ans; char b; //Input the numbers and operators save it in variables. cout<<"Enter the 1st no.\n"; cin>>a; cout<<"Enter the 2nd no.\n"; cin>>c; cout<<"Enter + for addition\n"; cout<<"Enter - for substraction\n"; cout<<"Enter * for multiplication\n"; cout<<"Enter / for division\n"; cin>>b; //conditional switch statement. switch (b) { case '+': ans=a+c; break; case '-': ans=a-c; break; case 'x': ans=a*c; break; case '/': ans=a/c; break; default: cout<<"Syntax Error"; } //print the ans cout<<"Ans = "<<ans<<"\n"; system ("pause"); }

Output

Enter the 1st no.
12
Enter the 2nd no.
5
Enter + for addition
Enter – for substraction
Enter x for multiplication
Enter / for division
x
Ans = 60