how to use switch case to take a string parameter?

Question

How do I take string input as a switch case parameter? I am able to do it with an int but not string.

The below code would be working if I was using an int input, but if I change to string it won't work.

#include <iostream>
#include <sstream>
#include <string>
#include <math.h>
class MissionPlan //start of MissionPlan class
{
    public:
    MissionPlan();
    float computeCivIndex(string,int,int,float,float);
}; //end of MissionPlan class

LocationData::LocationData()
{
    switch(sunType)
    {
        case "Type A": //compute 
                      break;
        case "Type B": //compute
                       break;
         //and many more case..
        default: break;
    }
}
int main()
{

    for(;;)
    {
    MissionPlan plan;
    }
    return 0;
}

I haven't touched C++ in over 12 years, but I'm pretty sure you can't. — jahroy
– jahroy, Commented Oct 22, 2012 at 17:38

Cogman · Accepted Answer · 2012-10-22 17:38:48Z

3

You cannot use a switch statement on a string in C++, sorry. You're best bet here is to use an enum. If you don't want to use an enum, then your only other option would be to do a bunch of if elses that check the strings for equality.

answered Oct 22, 2012 at 17:38

Cogman

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Comments

Bart Friederichs · Accepted Answer · 2012-10-22 17:39:19Z

0

C/C++ doesn't support switch statements with strings. Use if-else-if instead:

if (sunType.compare("Type A") == 0) {
     //compute
} else if (sunType.compare("Type B") == 0) {
     // compute
} else {
     // default
}

answered Oct 22, 2012 at 17:39

Bart Friederichs

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2 Comments

Heng Aik Hwee Over a year ago

cant i use if(sunType=="Type A") { //compute} ??

Bart Friederichs Over a year ago

I do not develop in C++ that much, but I do not see a overloaded == operator for the std::string class.

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