Try following example to understand all the Logical operators. Copy and paste following C program in test.c file and compile and run this program.
main()
{
int a = 21;
int b = 10;
int c ;
if( a == b )
{
printf("Line 1 - a is equal to b\n" );
}
else
{
printf("Line 1 - a is not equal to b\n" );
}
if ( a < b )
{
printf("Line 2 - a is less than b\n" );
}
else
{
printf("Line 2 - a is not less than b\n" );
}
if ( a > b )
{
printf("Line 3 - a is greater than b\n" );
}
else
{
printf("Line 3 - a is not greater than b\n" );
}
/* Lets change value of a and b */
a = 5;
b = 20;
if ( a <= b )
{
printf("Line 4 - a is either less than or euqal to b\n" );
}
if ( b >= a )
{
printf("Line 5 - b is either greater than or equal to b\n" );
}
if ( a && b )
{
printf("Line 6 - Condition is true\n" );
}
if ( a || b )
{
printf("Line 7 - Condition is true\n" );
}
/* Again lets change the value of a and b */
a = 0;
b = 10;
if ( a && b )
{
printf("Line 8 - Condition is true\n" );
}
else
{
printf("Line 8 - Condition is not true\n" );
}
if ( !(a && b) )
{
printf("Line 9 - Condition is true\n" );
}
}
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This will produce following result
Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or euqal to b
Line 5 - b is either greater than or equal to b
Line 6 - Condition is true
Line 7 - Condition is true
Line 8 - Condition is not true
Line 9 - Condition is true
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