CODEWITHSUNDEEP
cexpressionternary-operator
Alex
Alex

Reputation: 36111

Is it possible to have statements inside a ternary operator (in generated code)?

Disclaimer: I'm not writing code like this, I know it's ugly and unreadable.

I'm generating C, and I need everything to be in one expression.

This works:

#define true 1
int a  = (true) ? ( (true) ? (puts("a"), puts("b"),  1) : (2) ) : (3);
printf("%d\n", a);

a
b
1

But I also need to have statements, not just expressions. This fails to compile:

int a  = (true) ? ( (true) ? (puts("a"), puts("b"), (if (true) puts("c");),  1) : (2) ) : (3);

error: expected expression

Is it impossible to achieve in C?

Upvotes: 2

Views: 74

Answers (2)

Sourav Ghosh
Sourav Ghosh

Reputation: 134336

Using the gcc extension, you can wrap around the statements in braces, like

int a  = (true) ? ( (true) ? (puts("a"), puts("b"), ({if (true) puts("c");}),  1) : (2) ) : (3);

Upvotes: 4

Amadan
Amadan

Reputation: 198324

You cannot have statements inside an expression, no. However, as you noted, you can have boolean operators and the ternary operator.

if (true) puts("c");

can be written in an expression like

true ? puts("c") : false

or

true && puts("c")

Upvotes: 3

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