Logical operators are used to perform logical AND, OR and NOT operations. It is used to connect one or more relational/conditional expressions to form a complex logical expression. Any expression that evaluates to 0 is considered to be false and any expression that evaluates to non-zero value is considered to be true.
Logical operator example in C:
int x = 10, y = 20;
if ((x > 10) && (y > 10) { // checks whether both the expressions are true
printf("x and y are greater than 10");
}
if ((x > 10) || (y > 10) { // checks whether atleast any one of the expression is true
printf("any one or both x & y are greater than 10");
}
if (!(x > 10)) { // checks whether x is not greater than 10
printf("x is not greater than 10");
}
Logical operators in C:
Logical operator example in C:
int x = 10, y = 20;
if ((x > 10) && (y > 10) { // checks whether both the expressions are true
printf("x and y are greater than 10");
}
if ((x > 10) || (y > 10) { // checks whether atleast any one of the expression is true
printf("any one or both x & y are greater than 10");
}
if (!(x > 10)) { // checks whether x is not greater than 10
printf("x is not greater than 10");
}
Logical operators in C:
Operator | Operation |
&& | logical AND |
|| | logical OR |
! | logical NOT |
Below is the truth table for AND, OR and NOT logical operators.
Truth table for logical AND operator:
Operand1 | Operand2 | Result |
False | False | False |
False | True | False |
True | False | False |
True | True | True |
Truth table for logical OR operator:
Operand1 | Operand2 | Result |
False | False | False |
False | True | True |
True | False | True |
True | True | True |
Truth table for logical NOT operator:
Operand | Result |
False | True |
True | False |
Example C program using Logical Operators:
#include <stdio.h> int main() { int a, b; printf("Enter two number: "); scanf("%d%d", &a, &b); if ((a > 100) && (b > 100)) { printf("Both %d and %d are greater than 100\n", a, b); printf("Assigning 50 t0 b\n"); b = 50; } if ((b > 100) || (a > 100)) { printf("\nHitting Logical OR\n"); printf("%d is greater than 100\n\n", a); } if (!(b > 100)) { printf("%d is not greater than 100\n", b); printf("Hitting Logical NOT\n"); } return 0; }
Output:
jp@jp-VirtualBox:~/$ ./a.out
Enter two number: 101 200
Both 101 and 200 are greater than 100
Assigning 50 t0 b
Hitting Logical OR
101 is greater than 100
50 is not greater than 100
Hitting Logical NOT
Enter two number: 101 200
Both 101 and 200 are greater than 100
Assigning 50 t0 b
Hitting Logical OR
101 is greater than 100
50 is not greater than 100
Hitting Logical NOT
int x = 10, y = 20;
ReplyDeleteif ((x > 10) && (y > 10) { // checks whether both the expressions are true
printf("x and y are greater than 10");
sir please explain this ??
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ReplyDeleteLogical Operators always produces boolean results, either TRUE(non-zero value) or FALSE(zero value). There are 3 logical operators in C language AND(&&), OR(||) and NOT(!)
ReplyDeleteLogical operators in C