Output streams: print and write

This lesson demonstrates the published Scarp v0.0.5-alpha.1 output behavior with a complete compiler-owned program. print ends a line; write does not. The file below is also a conformance fixture, so its actual bytes are tested by the released interpreter in CI.

1. Create the program

Save this full source as output.srp:

// Output without a final newline.
bind name = "Scarp";
write("Hello, ");
print(name, 3, true,);
print();
write("done");

Verify and run it:

scarp check output.srp
scarp run output.srp

The visible standard output is:

Hello, Scarp 3 true

done

Important: There is no final newline after done. Code fences display text and do not by themselves convey the presence or absence of a final newline. The published output.stdout fixture records the exact bytes, and the compiler-conformance job checks the real interpreter output byte-for-byte.

2. Explain each output call

• write("Hello, "); writes a prefix without a line break.
• print(name, 3, true,); writes the arguments separated by spaces, then a newline. The trailing comma is supported by this published example.
• print(); writes a blank line.
• write("done"); appends done without a final line break.

In other words, the program emits Hello, Scarp 3 true, two newline characters, and then done. If you pipe output into another program, its final-newline behavior can matter.

3. Use the right output method

Use print for ordinary line-oriented messages, and write when you deliberately want to concatenate output without automatically ending a line. For CLI diagnostics and output budgets, refer to the output reference and diagnostics.

Compiler evidence: source example and expected output. Check the verified functions, loops, and vectors tutorials next.