Trouble with data structures

[tristanp2]

This is my first time using structs and I'm having trouble with understanding how to use one. I need to use a struct to organize the information for each sample.

This is the file that I must read the data from:

Total Number of Samples:\n 
8\n 
Tests Per Sample:\n 
5\n 
Lot:\t Sample:\t Emf (volts):\t   Measured Current (mA): \n     
2A304\t 1\t  100 120 140 160 180\t 26.67 32.97 38.57 42.78 49.32\n 
2A304\t 3\t  100 120 140 160 180\t 26.39 31.41 36.94 38.00 48.52\n
4B501\t 1\t  100 120 140 160 180\t 29.24 0 37.53 42.67 48.52\n
3C201\t 1\t  100 120 140 160 180\t 26.67 32.96 38.51 42.84 0\n
4B501\t 2\t  100 120 140 160 180\t 26.67 0 0 43.36 48.78\n
2A304\t 4\t  100 120 140 160 180\t 26.67 32.97 38.57 42.78\n 
3C201\t 3\t  100 120 140 160 180\t 26.25 33.01 38.54 42.84 49.12\n
3C201\t 4\t  100 120 140 160 180\t 26.67 32.96 38.51 42.84 0\n

I need to allow for 10 tests per sample and 10 samples per lot. Do I need to use a struct within a struct or something?

[personak]

Create a struct like so:

struct Sample {
    int lot;
    int sampleID;
    
    // this might also be a vector
    size_t nTests;
    Test[] tests;
};

struct Test {
    int emf;
    double ma;
}

[tristanp2]

Thanks for the help! What is size_ t nTests though?

[personak]

The number of tests. size_t is a typedef that measures the size of an array, like int.

You could also do vector<Test>, then you don't need to keep track of nTests.

[tristanp2]

Ok thanks. This was really helpful