Detta avsnitt kommer att diskutera den logiska NOT (!) operatorn i programmeringsspråket C. Som vi redan vet används den logiska operatorn för att utföra den logiska operationen genom att kombinera två eller flera villkor på de givna uttrycken. Om de logiska villkoren för operanderna är sanna, returnerar operatorn sanna booleska värden eller 1. Annars returnerar den ett falskt booleskt värde eller 0. De logiska operatorerna klassificeras i tre delar: Operatörerna Logical AND, Logical OR och Logical NOT.
De logisk OCH-operator används för att kontrollera att villkoren för två eller flera operander som finns kvar är sanna i ett givet uttryck; AND-operatorn returnerar ett sant eller icke-noll-värde (1). Annars returnerar den ett falskt eller 0-värde. Så vi kan säga att den logiska AND-operatorn endast kan utföras i ett uttryck när villkoren för båda operanderna är sanna, och om något villkor inte är sant, returnerar den 0. Den logiska AND-operatorn representeras som den dubbla et-tecken '&&'-symbolen.
Syntax:
(A > b && b > c)
De logisk ELLER-operator används för att kontrollera båda operandernas (A & B) villkor, och om en av operanderna eller uttrycken är sann returnerar operatorn ett sant booleskt värde. På samma sätt, om inget av uttrycken är sant, returnerar det ett falskt eller nollvärde. Den logiska ELLER-operatorn betecknas som dubbelröret '||' symbol.
Syntax:
(A > B) || (A <c) < pre> <h3>Logical NOT operator</h3> <p>The logical NOT operator is represented as the '!' symbol, which is used to reverse the result of any given expression or condition. If the result of an expression is non-zero or true, the result will be reversed as zero or false value. Similarly, if the condition's result is false or 0, the NOT operator reverses the result and returns 1 or true.</p> <p>For example, suppose the user enters a non-zero value is 5, the logical NOT (!) operator returns the 0 or false Boolean value. And if the user enters a zero (0) value, the operator returns the true Boolean value or 1. </p> <p> <strong>Syntax of the logical NOT operator</strong> </p> <pre> ! (condition); // It '!' represents the NOT operator </pre> <p>Here, the '!' symbol represents the logical NOT operator, which inverses the result of the given condition.</p> <h3>The truth table of the logical NOT operator:</h3> <p>Following is the truth table of the logical not operator in C</p> <pre> condition !(condition) 1 0 0 1 </pre> <h3>Example 1: Program to use the logical NOT operator in C</h3> <p>Let's create a simple program to reverse the given condition of the operands in the C programming language.</p> <pre> /* demonstration the use of the logical not operator in C. */ #include #include int main () { // declare an initialize x variable int x = 5; // display the result generated using the NOT (!) operator printf (' The return value = %d
', ! (x == 5)); printf (' The return value = %d
', ! (x != 5)); printf (' The return value = %d
', ! (x >= 3)); printf (' The return value = %d
', ! (x <3)); return 0; } < pre> <p> <strong>Output:</strong> </p> <pre> The return value = 0 The return value = 1 The return value = 0 The return value = 1 </pre> <p>In the above program, we use the NOT (!) operator to reverse the result of the various expression, such as the condition of the variable x is equal to 5, which is true. Still, the NOT operator reverses the result and returns 0. Similarly, we defined the condition (x!=5), but the logical operator changed its result and returned 1 and so on.</p> <h3>Example 2: Program to input a number to perform the logical NOT operator</h3> <p>Let's create a simple program to get the reverse result of an integer number using the logical NOT (!) operator in the C programming language.</p> <pre> /* demonstration the use of the logical not operator in C. */ #include #include int main () { // declare an initialize x variable int x, n; printf (' Enter the number: '); scanf ('%d', &x); n = !x; // use logical not operator to reverse the condition printf (' The result of x: %d', n); // display the result return 0; } </pre> <p> <strong>Output:</strong> </p> <pre> Enter the number: 7 The result of x: 0 </pre> <p>In the above program, we input an integer number 7 from the user and store it into x variable. After that, the logical NOT (!) operator reverses the value of x (non-zero) and returns zero (0) to print the result of x.</p> <p> <strong>2<sup>nd</sup> execution:</strong> </p> <pre> Enter the number: 0 The result of x: 1 </pre> <p>Similarly, we input zero (0) from the user and use the logical NOT (!) operator to reverse the value of x to a non-zero value, which is 1.</p> <h3>Example 3: Program to find the leap year using the logical AND (&&), OR (||), and NOT (!) operator</h3> <p>Let's write a simple program to check whether the given year is a leap or not using the logical AND (&&), logical OR (||), and the logical NOT (!) operator in the C language.</p> <pre> #include #include int main () { int yr; // declare int type variable printf (' Enter the year: '); scanf ('%d', &yr); // use the if..else statement to check the condition /* '&&' (AND) operator to validate both operand, '||' (OR) operator check ny given expressions are true, '!' (NOT) check the result of (yr % 100 != 0). */ if ( (yr % 400 == 0) || (yr % 4 == 0 && yr % 100 != 0)) { printf (' %d is a leap year.
', yr); } else { printf (' %d is not a leap year.
', yr); } return 0; } </pre> <p> <strong>Output:</strong> </p> <pre> Enter the year: 2020 2020 is a leap year. </pre> <p>In the above program, we enter 2020 and then check the given year by defining the if...else statement. In this statement, we defined two conditions;</p> <ol class="points"> <li>The given year is divided by 400, which is equal to 0. And then, we use the logical OR operator to check whether the left or right operand condition is true.</li> <li>In the second condition, the given year is divided by 4 and 100. But when we divide 2020 with 4, which is equal to 0. Similarly, we divide the year 2020 by 100, which is also not equal to 0. So, both the conditions are true that display the '2020 is a leap year'.</li> <li>But when we enter the year 2021, it prints the given result '2021 is not a leap year'.</li> </ol> <p> <strong>2<sup>nd</sup> execution:</strong> </p> <pre> Enter the year: 2021 2021 is not a leap year. </pre> <p> <strong>Example 4: Program to check different conditions using the AND, OR, and the NOT logical operator</strong> </p> <p>Let's write a program to demonstrate the multiple conditions of the given operands using the AND, OR, and the NOT logical operator in C.</p> <pre> /* program to check the various condition using the logical NOT operator in c. */ #include #include int main () { // declare and initialize variables int a = 20, b = 15; int n1 = 15, n2 = 17; // use logical 'AND' and logical 'NOT' operator if (a > b && a != 0) { printf (' The AND (&&) operator said: Both conditions are true.
'); } // use logical 'OR' and logical 'NOT' operator if (n1 > n2 || n2 != 15) if ( ! (a > b && a != 0 )) { printf (' The NOT (!) operator: Here both conditions are true.
'); } else { printf (' The NOT (!) operator: Here, both conditions are true. ' ' But, the status of the condition is reversed as false.
'); } return 0; } </pre> <p> <strong>Output:</strong> </p> <pre> The AND (&&) operator is said: Both conditions are true. The OR (||) operator is said: Only one condition is true. The NOT (!) operator: Here, both conditions are true. But, the status of the condition is reversed as false. </pre> <hr></3));></pre></c)> Här, '!' symbolen representerar den logiska NOT-operatorn, som inverserar resultatet av det givna villkoret.
Sanningstabellen för den logiska NOT-operatorn:
Följande är sanningstabellen för den logiska icke-operatorn i C
condition !(condition) 1 0 0 1
Exempel 1: Program för att använda den logiska NOT-operatorn i C
Låt oss skapa ett enkelt program för att vända det givna tillståndet för operanderna i programmeringsspråket C.
/* demonstration the use of the logical not operator in C. */ #include #include int main () { // declare an initialize x variable int x = 5; // display the result generated using the NOT (!) operator printf (' The return value = %d
', ! (x == 5)); printf (' The return value = %d
', ! (x != 5)); printf (' The return value = %d
', ! (x >= 3)); printf (' The return value = %d
', ! (x <3)); return 0; } < pre> <p> <strong>Output:</strong> </p> <pre> The return value = 0 The return value = 1 The return value = 0 The return value = 1 </pre> <p>In the above program, we use the NOT (!) operator to reverse the result of the various expression, such as the condition of the variable x is equal to 5, which is true. Still, the NOT operator reverses the result and returns 0. Similarly, we defined the condition (x!=5), but the logical operator changed its result and returned 1 and so on.</p> <h3>Example 2: Program to input a number to perform the logical NOT operator</h3> <p>Let's create a simple program to get the reverse result of an integer number using the logical NOT (!) operator in the C programming language.</p> <pre> /* demonstration the use of the logical not operator in C. */ #include #include int main () { // declare an initialize x variable int x, n; printf (' Enter the number: '); scanf ('%d', &x); n = !x; // use logical not operator to reverse the condition printf (' The result of x: %d', n); // display the result return 0; } </pre> <p> <strong>Output:</strong> </p> <pre> Enter the number: 7 The result of x: 0 </pre> <p>In the above program, we input an integer number 7 from the user and store it into x variable. After that, the logical NOT (!) operator reverses the value of x (non-zero) and returns zero (0) to print the result of x.</p> <p> <strong>2<sup>nd</sup> execution:</strong> </p> <pre> Enter the number: 0 The result of x: 1 </pre> <p>Similarly, we input zero (0) from the user and use the logical NOT (!) operator to reverse the value of x to a non-zero value, which is 1.</p> <h3>Example 3: Program to find the leap year using the logical AND (&&), OR (||), and NOT (!) operator</h3> <p>Let's write a simple program to check whether the given year is a leap or not using the logical AND (&&), logical OR (||), and the logical NOT (!) operator in the C language.</p> <pre> #include #include int main () { int yr; // declare int type variable printf (' Enter the year: '); scanf ('%d', &yr); // use the if..else statement to check the condition /* '&&' (AND) operator to validate both operand, '||' (OR) operator check ny given expressions are true, '!' (NOT) check the result of (yr % 100 != 0). */ if ( (yr % 400 == 0) || (yr % 4 == 0 && yr % 100 != 0)) { printf (' %d is a leap year.
', yr); } else { printf (' %d is not a leap year.
', yr); } return 0; } </pre> <p> <strong>Output:</strong> </p> <pre> Enter the year: 2020 2020 is a leap year. </pre> <p>In the above program, we enter 2020 and then check the given year by defining the if...else statement. In this statement, we defined two conditions;</p> <ol class="points"> <li>The given year is divided by 400, which is equal to 0. And then, we use the logical OR operator to check whether the left or right operand condition is true.</li> <li>In the second condition, the given year is divided by 4 and 100. But when we divide 2020 with 4, which is equal to 0. Similarly, we divide the year 2020 by 100, which is also not equal to 0. So, both the conditions are true that display the '2020 is a leap year'.</li> <li>But when we enter the year 2021, it prints the given result '2021 is not a leap year'.</li> </ol> <p> <strong>2<sup>nd</sup> execution:</strong> </p> <pre> Enter the year: 2021 2021 is not a leap year. </pre> <p> <strong>Example 4: Program to check different conditions using the AND, OR, and the NOT logical operator</strong> </p> <p>Let's write a program to demonstrate the multiple conditions of the given operands using the AND, OR, and the NOT logical operator in C.</p> <pre> /* program to check the various condition using the logical NOT operator in c. */ #include #include int main () { // declare and initialize variables int a = 20, b = 15; int n1 = 15, n2 = 17; // use logical 'AND' and logical 'NOT' operator if (a > b && a != 0) { printf (' The AND (&&) operator said: Both conditions are true.
'); } // use logical 'OR' and logical 'NOT' operator if (n1 > n2 || n2 != 15) if ( ! (a > b && a != 0 )) { printf (' The NOT (!) operator: Here both conditions are true.
'); } else { printf (' The NOT (!) operator: Here, both conditions are true. ' ' But, the status of the condition is reversed as false.
'); } return 0; } </pre> <p> <strong>Output:</strong> </p> <pre> The AND (&&) operator is said: Both conditions are true. The OR (||) operator is said: Only one condition is true. The NOT (!) operator: Here, both conditions are true. But, the status of the condition is reversed as false. </pre> <hr></3));> I programmet ovan använder vi operatorn NOT (!) för att vända resultatet av de olika uttrycken, som villkoret för variabeln x är lika med 5, vilket är sant. Ändå vänder NOT-operatorn resultatet och returnerar 0. På samma sätt definierade vi villkoret (x!=5), men den logiska operatorn ändrade sitt resultat och returnerade 1 och så vidare.
Exempel 2: Program för att mata in ett nummer för att utföra den logiska NOT-operatorn
Låt oss skapa ett enkelt program för att få det omvända resultatet av ett heltal med den logiska NOT (!) operatorn i programmeringsspråket C.
/* demonstration the use of the logical not operator in C. */ #include #include int main () { // declare an initialize x variable int x, n; printf (' Enter the number: '); scanf ('%d', &x); n = !x; // use logical not operator to reverse the condition printf (' The result of x: %d', n); // display the result return 0; } Produktion:
Enter the number: 7 The result of x: 0
I programmet ovan matar vi in ett heltal 7 från användaren och lagrar det i x-variabel. Därefter vänder den logiska NOT (!) operatorn värdet på x (ej noll) och returnerar noll (0) för att skriva ut resultatet av x.
2ndavrättning:
Enter the number: 0 The result of x: 1
På liknande sätt matar vi in noll (0) från användaren och använder den logiska NOT (!)-operatorn för att vända värdet på x till ett värde som inte är noll, vilket är 1.
Exempel 3: Program för att hitta skottåret med den logiska operatorn OCH (&&), ELLER (||) och INTE (!)
Låt oss skriva ett enkelt program för att kontrollera om det givna året är ett språng eller inte med den logiska AND (&&), logiska ELLER (||) och den logiska NOT (!) operatorn i C-språket.
#include #include int main () { int yr; // declare int type variable printf (' Enter the year: '); scanf ('%d', &yr); // use the if..else statement to check the condition /* '&&' (AND) operator to validate both operand, '||' (OR) operator check ny given expressions are true, '!' (NOT) check the result of (yr % 100 != 0). */ if ( (yr % 400 == 0) || (yr % 4 == 0 && yr % 100 != 0)) { printf (' %d is a leap year.
', yr); } else { printf (' %d is not a leap year.
', yr); } return 0; } Produktion:
Enter the year: 2020 2020 is a leap year.
I programmet ovan går vi in i 2020 och kontrollerar sedan det givna året genom att definiera if...else-satsen. I detta uttalande definierade vi två villkor;
- Det givna året divideras med 400, vilket är lika med 0. Sedan använder vi den logiska ELLER-operatorn för att kontrollera om det vänstra eller högra operandvillkoret är sant.
- I det andra villkoret divideras det givna året med 4 och 100. Men när vi delar 2020 med 4, vilket är lika med 0. På samma sätt delar vi år 2020 med 100, vilket inte heller är lika med 0. Så båda villkoren är sanna som visar '2020 är ett skottår'.
- Men när vi går in i år 2021, skrivs det givna resultatet '2021 är inte ett skottår'.
2ndavrättning:
Enter the year: 2021 2021 is not a leap year.
Exempel 4: Program för att kontrollera olika villkor med hjälp av OCH, ELLER och den logiska operatorn INTE
Låt oss skriva ett program för att demonstrera de multipla villkoren för de givna operanderna med hjälp av AND, OR och NOT logiska operatorerna i C.
/* program to check the various condition using the logical NOT operator in c. */ #include #include int main () { // declare and initialize variables int a = 20, b = 15; int n1 = 15, n2 = 17; // use logical 'AND' and logical 'NOT' operator if (a > b && a != 0) { printf (' The AND (&&) operator said: Both conditions are true.
'); } // use logical 'OR' and logical 'NOT' operator if (n1 > n2 || n2 != 15) if ( ! (a > b && a != 0 )) { printf (' The NOT (!) operator: Here both conditions are true.
'); } else { printf (' The NOT (!) operator: Here, both conditions are true. ' ' But, the status of the condition is reversed as false.
'); } return 0; } Produktion:
The AND (&&) operator is said: Both conditions are true. The OR (||) operator is said: Only one condition is true. The NOT (!) operator: Here, both conditions are true. But, the status of the condition is reversed as false.