What is the printf format specifier for bool?

Question

What is the printf format specifier for bool?

Since ANSI C99 there is _Bool or bool through stdbool.h. However, is there likewise a printf format specifier for bool?

I mean something like in that pseudo-code:

bool x = true;

printf("%B\n", x);

which would print:

true

boolean printf

4 years ago by Bharatgxwzm

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**rahul07** · Answer 1 · 2021-05-15T13:48:45

There is no format specifier for bool. You can print it using some of the existing specifiers for printing integral types or do something more fancy:



 printf("%s", x?"true":"false");

**RoliMishra** · Answer 2 · 2021-05-17T14:46:22

ANSI C99/C11 don't include an extra printf conversion specifier for bool. However, since any integral type shorter than int is promoted to int when passed down to printf(), you can use %d:

bool x = true;

printf("%d\n", x); // prints 1

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What is the printf format specifier for bool?

2 Answers

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