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    #include <iostream>

using namespace std;



int main(){

int x;

int y;

int subtraction=x-y;



cout<< "enter an num\n";

cin>>x;

cout<< "one more\n";

cin>>y;

cout<< "answer is\n";

cout<<subtraction;

return 0;

}

why does this program not subtract properly but the one on the bottom does???

    #include <iostream>

using namespace std;



int main(){

int x;

int y;

int subtraction;



cout<< "enter an num\n";

cin>>x;

cout<< "one more\n";

cin>>y;

cout<< "answer is\n";

subtraction=x-y;

cout<<subtraction;

return 0;

}

In the first example you affect a value to a variable through an operation with variables that weren't initialized. You can't magically expect the computer to know which numbers the user will input.