(10/10/00 - Page 1)
Comments
are any text between “/*” and the next “*/”.
You should use them liberally throughout your program to improve the
readability, and understandability, of your code.
To
work with logical statements in C, it is important to realize that an integer
that is zero is interpreted as FALSE, any non zero integer is interpreted as
TRUE.
void
main() {
int i, j, k;
i=0;
j=3;
/*Comparisons*/
k= i<j; /*k is TRUE
because i is less than j*/
k= i>j; /*k is FALSE*/
k= i<=j; /*k is TRUE
because i is less than or equal to j*/
k= i==j; /*k is FALSE because
i is not equal to j*/
k= i!=j; /*k is TRUE because
i is not equal to j*/
k= i=j; /*k is TRUE. This example sets i=j, then sets k=i, so k
will
be 3, which is TRUE. This is a
subtle, and very common
mistake. Make sure you use “==”
to check for equality. */
i=0;
k= j=i; /*k
is FALSE.*/
/*Logical Operators*/
i=0; /*i is FALSE*/
j=3; /*j is TRUE*/
k= i&&j; /*k is FALSE*/
k= i||j; /*k
is TRUE*/
k= !i && j; /*k is TRUE. NOT (!) has
precedence over AND (&&)*/
}
void
main() {
int i,j,k;
i=0;
j=3;
k= i;
/*k=_______________*/
k= j;
/*k=_______________*/
k= !j;
/*k=_______________*/
k= !(i==j);
/*k=_______________*/
k= i==!j;
/*k=_______________*/
k= i=!j;
/*k=_______________*/
k= !(i<j);
/*k=_______________*/
k= i>=j;
/*k=_______________*/
k= (i<j) && (i>j); /*k=_______________*/
k= !(!(i<j) || !(i>j)); /*k=_______________*/
}