While knowing about expression evaluation we must understand what is an expression in C and what is an expression means. An expression in C is defined as 2 or more operands are connected by one operator and which can also be said to a formula to perform any operation. An operand is a function reference, an array element, a variable, or any constant. An operator is symbols like “+”, “-“, “/”, “*” etc. Now expression evaluation is nothing but operator precedence and associativity. Expression precedence in C tells you which operator is performed first, next, and so on in an expression with more than one operator with different precedence. This plays a crucial role while we are performing day to day arithmetic operations. If we get 2 same precedences appear in an expression, then it is said to be “Associativity”. Now in this case we can calculate this statement either from Left to right or right to left because this both are having the same precedence.
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In C there are 4 types of expressions evaluations
Every expression evaluation of these 4 types takes certain types of operands and used a specific type of operators. The result of this expression evaluation operation produces a specific value.
Below are some examples mentioned:
Addition (+), Subtraction(-), Multiplication(*), Division(/), Modulus(%), Increment(++) and Decrement(–) operators are said to “Arithmetic expressions”. These operators work in between operands. like A+B, A-B, A–, A++ etc. While we perform the operation with these operators based on specified precedence order as like below image.
A+B*C/D-E%F
Arithmetic Expression evaluation order:
Code:
Explanation: As you can see in the above example arithmetic expression values evaluated based on precedence as the first *, followed by /, %, + and -.
Relation expression evaluation order:
Code:
Explanation: As you can see in the above example relational expression values evaluated based on precedence as First , >=, ==, !=.
&&(Logical and), ||(Logical or) and !(Logical not) operators are said to “Logical expressions”. Used to perform a logical operation. These operators work in between operands. Like A&&B, A||B, A!B etc. While we perform the operation with these operators based on specified precedence order as like the below image.
Logical expression evaluation order:
Code:
Explanation: As you can see in the above example logical expression values evaluated based on precedence as the First &&, followed by || and !.
?(Question mark) and :(colon) are said to “Conditional expressions”. Used to perform a conditional check. It has 3 expressions first expression is condition. If it is true then execute expression2 and if it is false then execute expression3. Like (A>B)?”A is Big”:”B is Big”. While we perform the operation with these operators based on specified precedence order as like the below image.
(X+2=10)?’true’:’false’;
Conditional expression Evaluation order:
Code:
//used to include basic C libraries #include //main method for run c application int main() < //declaring variables int a,b,c; int result_con_eval; //Asking the user to enter 3 numbers printf("Enter 3 numbers for Conditional evaluation operation\n"); //Storing 3 numbers in varaibles a, b and c scanf("%d\n%d\n%d",&a,&b,&c); //Conditional evaluation operations and its result displaying result_con_eval=(a>b && a>b)? a: (b>a && b>c)? b:c; printf("================CONDITIONAL EXPRESSION EVALUATION==============\n"); printf("Maximum value of %d, %d and %d is = %d \n",a,b,c,result_con_eval); printf("============================================================== alignnone wp-image-368914 size-full" svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20561%20145'%3E%3C/svg%3E" alt="Conditional expression Evaluation" width="561" height="145" data-lazy-srcset="https://cdn.educba.com/academy/wp-content/uploads/2020/05/expression-evaluation-in-c8.jpg 561w, https://cdn.educba.com/academy/wp-content/uploads/2020/05/expression-evaluation-in-c8-300x78.jpg 300w" data-lazy-sizes="(max-width: 561px) 100vw, 561px" data-lazy-src="https://cdn.educba.com/academy/wp-content/uploads/2020/05/expression-evaluation-in-c8.jpg" />
Explanation: As you can see in the above example conditional expression values evaluated based on precedence as First ? and:.
Expression evaluation in C is used to determine the order of the operators to calculate the accurate output. Arithmetic, Relational, Logical, and Conditional are expression evaluations in C.
This is a guide to Expression Evaluation in C. Here we discuss an introduction to Expression Evaluation in C, with types and respective examples for better understanding. You can also go through our other related articles to learn more –
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