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<boolean-expression> && <boolean-expression>
/* Example of && operator */
#include<stdio.h>
int main()
{
int a=10, b=20;
char ch1='a', ch2 ='b';
double d=2.5;
if(a<15 && a>10) /* a is less than 15 and a is greater than 10 */
printf("a<15 && a>10, is true \n");
if(b<25 && b>19) /* b is less than 25 and a is greater than 19 */
printf("b<25 && b>19, is true \n");
if(ch1=='a' && ch2=='b') /* ch1 has 'a' and ch2 has a 'b' */
printf("ch1=='a' && ch1=='c', is true \n");
if(d>2 && ch2=='b') /* d is greater than 2 and ch2 has a value 'b', is true */
printf("d>2 && ch2==b, is true \n");
if(a<=10 && d<=2.5) /* a is less than or equal to 10 and d is less than or equal to 2.5 */
printf("a<=10 && d<=2.5, is true \n");
if(a<10 && ch1=='a') /*a is less than 10 and ch1 has a value 'a' */
printf("a<=10 and b>=20, is true");
}
b<25 && b>19, is true
ch1=='a' && ch1=='c', is true
d>2 && ch2=='b', is true
a<=10 && d<=2.5, is true
<boolean-expression> || <boolean-expression>
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/* Example with || operator */
#include<stdio.h>
int main()
{
int a=10, b=20;
char ch1='a', ch2 ='b';
double d=2.5;
if(a<15 || a>10) /* a is less than 15 or a is greater than 10 */
printf("a<15 || a>10, is true \n");
if(ch1=='a' || ch2=='b') /* ch1 has 'a' or ch2 has a value 'b' */
printf("ch1=='a' || ch1=='c', is true \n");
if(b<25 || b>19) /* b is less than 25 or a is greater than 19 */
printf("b<25 || b>19, is true \n");
if(d>2 || ch2=='b') /* d is greater than 2 or value in ch2 has a value 'b', is true */
printf("d>2 || ch2==b, is true \n");
if(a<=10 || d<=2.5) /* a is less than or equal to 10 or d is less than or equal to 2.5 */
printf("a<=10 || d<=2.5, is true \n");
if(a<10 || ch1=='a') /* a is less than 10 or ch1 has a value 'a' */
printf("a<10 || ch1=='a', is true");
return 0;
}
a<15 || a>10, is true
ch1=='a' || ch1=='c', is true
b<25 || b>19, is true
d>2 || ch2==b, is true
a<=10 || d<=2.5, is true
a<10 || ch1=='a', is true
<boolean-expression> && <boolean-expression>
/* Example with & operator */
#include<stdio.h>
int main()
{
int a=10, b=20;
char ch1='a', ch2 ='b';
double d=2.5;
if(a<15 & a>10) /* a is less than 15 and a is greater than 10 */
printf("a<15 & a>10, is true \n");
if(b<25 & b>19) /* b is less than 25 and a is greater than 19 */
printf("b<25 & b>19, is true \n");
if(ch1=='a' & ch2=='b') /* ch1 has 'a' and ch2 has a value 'b' */
printf("ch1=='a' & ch1=='c', is true \n");
if(d>2 & ch2=='b') /* d is greater than 2 and value in ch2 has a value 'b', is true */
printf("d>2 & ch2=='b', is true \n");
if(a<=10 & d>=2.5) /* a is less than or equal to 10 and d is greater than or equal to 2.5 */
printf("a<=10 & d<=2.5, is true \n");
if(a<10 & ch1=='a') /* a is less than 10 and ch1 has a value 'a' */
printf("a<10 & ch1=='a', is true");
return 0;
}
b<25 & b>19, is true
ch1=='a' & ch1=='c', is true
d>2 & ch2=='b', is true
a<=10 & d<=2.5, is true
Note: There should never be any space between > and = of >= operator, or a compile error is thrown.
<boolean-expression> | <boolean-expression>
/* Example with | operator */
#include<stdio.h>
int main()
{
int a=10, b=20;
char ch1='a', ch2 ='b';
double d=2.5;
if(a<15 | a>10) /* a is less than 15 and a is greater than 10 */
printf("a<15 | a>10, is true \n");
if(b<25 | b>19) /* b is less than 25 and a is greater than 19 */
printf("b<25 | b>19, is true \n");
if(ch1=='a' | ch2=='b') /* ch1 has 'a' and ch2 has a value 'b' */
printf("ch1=='a' | ch1=='c', is true \n");
if(d>2 | ch2=='b') /* d is greater than 2 and value in ch2 has a value 'b', is true */
printf("d>2 | ch2=='b', is true \n");
if(a<=10 | d>=2.5) /*a is less than or equal to 10 and d is greater than or equal to 2.5 */
printf("a<=10 | d<=2.5, is true \n");
if(a<10 | ch1=='a') /* a is less than 10 and ch1 has a value 'a' */
printf("a<10 | ch1=='a', is true");
return 0;
}
Output -
a<15 | a>10, is true
b<25 | b>19, is true
ch1=='a' | ch1=='c', is true
d>2 | ch2=='b', is true
a<=10 | d<=2.5, is true
a<10 | ch1=='a', is true
Note: There should never be any space between = and = of == operator, or a compile error is thrown.
!<boolean-expression>
/* Example with ! (NOT operator) */
#include<stdio.h>
int main()
{
int a=10, b=20;
char ch1='a', ch2 ='b';
double d=2.5;
if(!(10>15)) /* Inverting the value of an expression (10>15)*/
printf("!(10>15), is true \n");
if( !(b<25 || b>19) ) /* Inverting the value of an expression (b<25 || b>19) */
printf("!(b<25 | b>19), is false \n");
if( !(ch1=='a' && ch2=='b') ) /* Inverting the boolean value of (ch1=='a' && ch2=='b') */
printf("!(ch1=='a' && ch2=='b'), is false \n");
if(d>2 & !(ch2=='b')) /* Inverting the boolean value of an expression (ch2=='b') */
printf("d>2 & !(ch2=='b'), is true \n");
if( !(a<=10 | d>=2.5) ) /* Inverting the boolean value of (a<=10 | d>=2.5) */
printf("a<=10 | d<=2.5, is true \n");
if(!(a<10)) /* Inverting the boolean value of (a<10) */
printf("!(a<10) is true \n");
if(!0) /* Inverting 0(false) to 1(true) */
printf("This will be printed");
if(!1) /* Inverting 1(true) to 0(false) */
printf("This will not be printed \n");
return 0;
}
!(10>15), is true
!(a<10) is true
This will be printed
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