c possible assignment in condition

The reason is: Performance improvement (sometimes) Less code (always) Take an example: There is a method someMethod() and in an if condition you want to check whether the return value of the method is null. If not, you are going to use the return value again. If(null != someMethod()){. String s = someMethod();

The common pattern, however, is that the condition itself is trivial, usually relying completely on some implicit conversion to bool. Since collections don't do that, putting an empty test there would be considered less idiomatic. C culture is even more accepting, with the fgetc loop idiom looking like this:

The answers by Tulains Córdova and hvd cover the clarity/readability aspects quite well. Let me throw in scoping as another reason in favour of assignments in conditions. A variable declared in the condition is only available in that statement's scope. You cannot use that variable afterwards by accident. The for loop has been doing this for ...

Using an assignment as a condition is a common mistake, though sometimes this expression is valid. To properly format an assignment as a condition, a comparison must be made. Specifically, code ...

7 Assignment Expressions. As a general concept in programming, an assignment is a construct that stores a new value into a place where values can be stored—for instance, in a variable. Such places are called lvalues (see Lvalues) because they are locations that hold a value. An assignment in C is an expression because it has a value; we call it an assignment expression.

In the above code in the C Online Compiler, the first if statement checks whether a>b.; If a is greater than b, the nested if statement is checked.; If the nested if condition is false, the else statement in the nested if block gets executed.; If the first if statement evaluates to false, the nested if block gets skipped and the else block executes.. Output 10 is even

Assignment and Conditional Operators in C. The assignment operator ( =) is used to assign a value to a variable. It has the following syntax: variable = expression; Where variable is the name of the variable to be assigned a value, and expression is the value to be assigned. Example: int x; x = 5; // Assigning the value 5 to variable x.

Conditional statement in C programming are used to base choices on the conditions. When there is no condition surrounding the statements, conditional statement in C are executed sequentially. The execution flow may alter if a condition is added to a block of statements depending on the outcome of the condition's evaluation.

The conditional statements (also known as decision control structures) such as if, if else, switch, etc. are used for decision-making purposes in C programs. They are also known as Decision-Making Statements and are used to evaluate one or more conditions and make the decision whether to execute a set of statements or not.

Basically C evaluates expressions. In. s = data[q] The value of data[q] is the the value of expression here and the condition is evaluated based on that. The assignment. s <- data[q] is just a side-effect.

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Code language:C++(cpp) The = assignment operator is called a simple assignment operator. It assigns the value of the left operand to the right operand. Besides the simple assignment operator, C supports compound assignment operators. A compound assignment operator performs the operation specified by the additional operator and then assigns the ...

Simple assignment operator. Assigns values from right side operands to left side operand. C = A + B will assign the value of A + B to C. +=. Add AND assignment operator. It adds the right operand to the left operand and assign the result to the left operand. C += A is equivalent to C = C + A. -=.

Assignment performs implicit conversion from the value of rhs to the type of lhs and then replaces the value in the object designated by lhs with the converted value of rhs . Assignment also returns the same value as what was stored in lhs (so that expressions such as a = b = c are possible). The value category of the assignment operator is non ...

The conditional operator in C is kind of similar to the if-else statement as it follows the same algorithm as of if-else statement but the conditional operator takes less space and helps to write the if-else statements in the shortest way possible. It is also known as the ternary operator in C as it operates on three operands.. Syntax of Conditional/Ternary Operator in C

1. "=": This is the simplest assignment operator. This operator is used to assign the value on the right to the variable on the left. Example: a = 10; b = 20; ch = 'y'; 2. "+=": This operator is combination of '+' and '=' operators. This operator first adds the current value of the variable on left to the value on the right and ...

I am aware that when a non zero value is provided as a condition in an if statement, the condition is evaluated to be true. Yet, I'm wondering how an assignment(=) is evaluated to be true here, instead of a comparison(==), and runs without any errors in the below C program.

"assignment in conditional expression" とかで検索するしかなさそうな気がします。 一般論としては、比較演算子とのタイプミスだったりする可能性があるため、 避ける方が多い書き方かと思います。

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Conditional statements in programming are used to control the flow of a program based on certain conditions. These statements allow the execution of different code blocks depending on whether a specified condition evaluates to true or false, providing a fundamental mechanism for decision-making in algorithms. In this article, we will learn about the basics of Conditional Statements along with ...

For your specific example: while (c = getchar(), c != EOF && c != 'x') the following occurs: c = getchar() is executed fully (the comma operator is a sequence point). c != EOF && c != 'x' is executed. the comma operator throws away the first value (c) and "returns" the second. the while uses that return value to control the loop.

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@Mike Both, but what I was thinking of was the assignment in a conditional. Single statements that do more than one thing generally make code difficult to read. (On the other hand, the a lot of places would make an exception to side effects in a conditional for the single case of IO, and things like while ( std::getline(...) ) are widespread ...