将C ++程序的输出发送到变量bash中

Question

I'm trying to write a system that grades a c++ code with pre-written examples that i have ready. It's a very simple c++ code like the following:

#include <iostream>
using namespace std;
int main()
{
    int a;
    cin >> a;
    if (a > 100)
        cout << "Big";
    else
        cout << "Small";
    return 0;
}

So i want to test and grade this program with a bash, declare a score variable and echo it in the end. Here's what i wrote(I've marked where i need help writing with double quotes)

#!/bin/bash
g++ new.cpp -o new
test1=101
test2=78
score=0
if [ "Result of executing ./new with $test1 variable as input"=="Big" ]
then
(( score += 50 ))
fi
if [ "Result of executing ./new with $test2 variable as input"=="Small" ]
then
(( score += 50 ))
fi
echo $score

Also i'm still very new to bash so if you can tell me a simpler way to use bash for the examples (like loops) i'd love to hear it. Thanks!

Answer 1

If you want to execute new with the params and get its result, you should try something like this:

#!/bin/bash
g++ new.cpp -o new
test1=101
test2=78
score=0
if [ $(./new $test1) == "Big" ]; then
    (( score += 50 ))
fi
if [ $(./new $test2) == "Small" ]; then
    (( score += 50 ))
fi
echo $score