Thread: MOD operator not working right...

Hello all.... I am writing a program that will work similar to Matlab (a math program) ... but, I can not get MOD to work right... can some one please explain how to make it work... here is my code...

Code:

#include <iostream>
#include <cmath>
using namespace std;

int getOperand(char ch); 
int IsInList(char ch);

char cVar[10]; 
double dVar[10]; 
int varNum; 

int main ( )
{
 char ch;
    char op;
    int op1;
    int op2;
    double res;
    varNum = 0;

    do 
    {
        cout << ">> "; 
        cin >> ch;
        if (ch == 'q') 
        {
            break;
        }
        
    op1 = getOperand(ch);

    cin >> ch;
    if(ch == '=')
    {
        cin >> dVar[op1];
        cout << cVar[op1] << " =\n\n";
        cout << "      " << dVar[op1] << "\n\n";
    }
    else
    {
        op = ch;

        cin >> ch;
        op2 = getOperand(ch);

        switch(op)
        {
        case '+':
                res = dVar[op1] + dVar[op2];
                cout << "Ans = \n\n"; 
                cout << "       " << res << "\n\n";
                break;
        case '*':
                res = dVar[op1] * dVar[op2];
                cout << "Ans = \n\n";
                cout << "        " << res << "\n\n";
                break;
        case '/':
                res = dVar[op1]/dVar[op2];
                cout << "Ans = \n\n";
                cout << "        " << res << "\n\n";
                break;
        case '-':
                res = dVar[op1] - dVar[op2];
                cout << "Ans = \n\n";
                cout << "        " << res << "\n\n";
                break;
        case 'mod':
                res = MOD(dVar[op1],dVar[op2]);
                cout << "Ans = \n\n";
                cout << "        " << res << "\n\n";
                break;
        }
    }

    }
    while (1); 
    
}

int getOperand(char ch) 
{
    int iVar;
    iVar = IsInList(ch);

        if (iVar == -1)
        {
            cVar[varNum] = ch;
            iVar = varNum;
            varNum++;
        }
    
    return iVar; 
}

int IsInList(char ch) 
{
    for (int i = 0; i < 10; i++)
    {
        if(ch == cVar[i]) 
        {
            return i;
        }
    }

    return -1;    
}

the "case 'mod':" is not working... can someone please review and tell me what i am doing wrong? Thanks.

Okay I changed it but, when I compile i get an error... it says "invalid operands of types 'double' and 'double' to binary'

You can do mod on doubles by using fmod() from <cmath>

Ok... so how do I fix it?
This is my first time taking this class. I am not that good.
Thanks.

disregard i got it thanks thantos