Lab 1: Compiler Toolchain

Enid M. Cruz-Colón
COMP 3010-030
HW 1: Compiler Toolchain
Problem 1
(a) The name of the executable program created by the compiler if the programmer does not
specify one is a.out.
(b) To compile a program and rename the executable file with a name other than the default
name, a.out, the command is:
g++ -o <new_name>.out <sourcecode_name>.cpp
Problem 2
The -Wall command line enables error warnings from the compiler when compiling your source
code.
The -c command line compiles a source code into an object file, not yet executable.
With the command g++ -o MyFirstProgram MyFirstSource.o we accomplish to change the
object code into machine code and store it in an executable program.
Problem 3
To change the program for it to greet the user with Hello, I inserted the following line, right
after the int number_of_pods, peas_per_pod, total_peas; line:
cout << “Hellon”;
To change the program for it to output Goodbye at the end, I inserted the following line, right
before the return 0; line:
cout << “Goodbyen”;
Problem 4
When replacing the “*” operator in the computation with a “/” and entering 0 for the number of
peas per pod, the compiler gives the following error: Floating point exception (core dumped). It
gives an error because the program is dividing the number of pods by peas per pod and you cannot
divide by 0.
Problem 5
When replacing the “/” operator in the computation with the “+” operator, the compiler does not
issue any errors, but the program gives a wrong answer.
Problem 6
(a) Error: Extra space between < and iostream.
Message: MyFirstSource.cpp:3:21: fatal error: iostream: No such file or directory
#include < iostream>
(b) Error: Omit < symbol in the #include directive.

Message: MyFirstSource.cpp:3:12: error: #include expects "FILENAME" or
<FILENAME>
#include iostream>
^
MyFirstSource.cpp: In function ‘int main()’:
MyFirstSource.cpp:8:3: error: ‘cout’ was not declared in this scope
cout << "Hellon";
^
MyFirstSource.cpp:11:3: error: ‘cin’ was not declared in this scope
cin >> number_of_pods;
^
(c) Error: Omit int from int main().
Message: MyFirstSource.cpp:5:10: warning: ISO C++ forbids declaration of ‘main’
with no type [-Wreturn-type]
main()
^
(d) Error: Misspell the word main.
Message: /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crt1.o: In function
`_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
(e) Error: Omit (.
Message: MyFirstSource.cpp:5:9: error: expected initializer before ‘)’ token
int main)
^
Error: Omit both ( and ).
Message: MyFirstSource.cpp:6:1: warning: extended initializer lists only available
with -std=c++11 or -std=gnu++11
{
^
MyFirstSource.cpp:7:3: error: expected primary-expression before ‘int’
int number_of_pods, peas_per_pod, total_peas;
^
MyFirstSource.cpp:7:3: error: expected ‘}’ before ‘int’
MyFirstSource.cpp:7:3: error: expected ‘,’ or ‘;’ before ‘int’
MyFirstSource.cpp:8:3: error: ‘cout’ does not name a type
cout << "Hellon";
^
cout << "Press return after entering a number.n";
^
cout << "Enter the number of pods:n";
^

MyFirstSource.cpp:11:3: error: ‘cin’ does not name a type
cin >> number_of_pods;
^
cout << "Enter the number of peas in a pod:n";
^
MyFirstSource.cpp:13:3: error: ‘cin’ does not name a type
cin >> peas_per_pod;
^
MyFirstSource.cpp:14:3: error: ‘total_peas’ does not name a type
total_peas = number_of_pods + peas_per_pod;
^
cout << "If you have ";
^
cout << number_of_pods;
^
cout << " pea podsn";
^
cout << "and ";
^
cout << peas_per_pod;
^
cout << " peas in each pod, thenn";
^
cout << "you have ";
^
cout << total_peas;
^
cout << " peas in all the pods.n";
^
cout << "Goodbyen";
^
MyFirstSource.cpp:25:3: error: expected unqualified-id before ‘return’
return 0;
^
MyFirstSource.cpp:26:1: error: expected declaration before ‘}’ token
}
^

(f) Error: Misspell cin.
Message: MyFirstSource.cpp: In function ‘int main()’:
MyFirstSource.cpp:11:3: error: ‘cn’ was not declared in this scope
cn >> number_of_pods;
^

Lab 1: Compiler Toolchain

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