From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/language%2Foperator_incdec.html | 98 ------------------------------- 1 file changed, 98 deletions(-) delete mode 100644 devdocs/c/language%2Foperator_incdec.html (limited to 'devdocs/c/language%2Foperator_incdec.html') diff --git a/devdocs/c/language%2Foperator_incdec.html b/devdocs/c/language%2Foperator_incdec.html deleted file mode 100644 index 37060cb3..00000000 --- a/devdocs/c/language%2Foperator_incdec.html +++ /dev/null @@ -1,98 +0,0 @@ -

Increment/decrement operators

Increment/decrement operators are unary operators that increment/decrement the value of a variable by 1.

-

They can have postfix form:

- - - -
expr ++
expr --

As well as the prefix form:

- - - -
++ expr
-- expr

The operand expr of both prefix and postfix increment or decrement must be a modifiable lvalue of integer type (including _Bool and enums), real floating type, or a pointer type. It may be cvr-qualified, unqualified, or atomic.

-

The result of the postfix increment and decrement operators is the value of expr.

-

The result of the prefix increment operator is the result of adding the value 1 to the value of expr: the expression ++e is equivalent to e += 1. The result of the prefix decrement operator is the result of subtracting the value 1 from the value of expr: the expression --e is equivalent to e -= 1.

-

Increment operators initiate the side-effect of adding the value 1 of appropriate type to the operand. Decrement operators initiate the side-effect of subtracting the value 1 of appropriate type from the operand. As with any other side-effects, these operations complete at or before the next sequence point.

-
int a = 1;
-int b = a++; // stores 1+a (which is 2) to a
-             // returns the old value of a (which is 1)
-             // After this line, b == 1 and a == 2
-a = 1;
-int c = ++a; // stores 1+a (which is 2) to a
-             // returns 1+a (which is 2)
-             // after this line, c == 2 and a == 2
- -

Post-increment or post-decrement on any atomic variable is an atomic read-modify-write operation with memory order memory_order_seq_cst.

-		 (since C11)

See arithmetic operators for limitations on pointer arithmetic, as well as for implicit conversions applied to the operands.

-

Notes

Because of the side-effects involved, increment and decrement operators must be used with care to avoid undefined behavior due to violations of sequencing rules.

-

Increment/decrement operators are not defined for complex or imaginary types: the usual definition of adding/subtracting the real number 1 would have no effect on imaginary types, and making it add/subtract i for imaginaries but 1 for complex numbers would have made it handle 0+yi different from yi.

-

Unlike C++ (and some implementations of C), the increment/decrement expressions are never themselves lvalues: &++a is invalid.

-

Example

#include <stdio.h>
-#include <stdlib.h>
- 
-int main(void)
-{
-    int a = 1;
-    int b = 1;
- 
-    printf("original values: a == %d, b == %d\n", a, b);
-    printf("result of postfix operators: a++ == %d, b-- == %d\n", a++, b--);
-    printf("after postfix operators applied: a == %d, b == %d\n", a, b);
-    printf("\n");
- 
-    // Reset a and b.
-    a = 1;
-    b = 1;
- 
-    printf("original values: a == %d, b == %d\n", a, b);
-    printf("result of prefix operators: ++a == %d, --b == %d\n", ++a, --b);
-    printf("after prefix operators applied: a == %d, b == %d\n", a, b);
-}

Output:

-
original values: a == 1, b == 1
-result of postfix operators: a++ == 1, b-- == 1
-after postfix operators applied: a == 2, b == 0
- 
-original values: a == 1, b == 1
-result of prefix operators: ++a == 2, --b == 0
-after prefix operators applied: a == 2, b == 0

References

See also

Operator precedence

- - - -
Common operators
assignment increment
decrement 		arithmetic logical comparison member
access 		other

a = b a += b a -= b a *= b a /= b a %= b a &= b a |= b a ^= b a <<= b a >>= b

-

++a --a a++ a--

-

+a -a a + b a - b a * b a / b a % b ~a a & b a | b a ^ b a << b a >> b

-

!a a && b a || b

-

a == b a != b a < b a > b a <= b a >= b

-

a[b] *a &a a->b a.b

-

a(...) a, b (type) a a ? b : c sizeof

_Alignof
(since C11)

-
-
C++ documentation for Increment/decrement operators
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/language/operator_incdec -

-
-- cgit v1.2.3