Liza Fireman Tutorial #3 Summer 2005. Liza Fireman Keywords whilevolatilevoidunsigned...
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Transcript of Liza Fireman Tutorial #3 Summer 2005. Liza Fireman Keywords whilevolatilevoidunsigned...
Liza Fireman
Keywords
unsignedvoidvolatilewhile
structswitchtypedefunion
shortsignedsizeofstatic
intLongregisterreturn
floatforgotoif
doubleelseenumextern
constcontinuedefaultdo
breakautocasechar
Liza Fireman
Names – legal or not?
the_one
temp
do_it!
intro2cs
drink-me
1st_street
counter
!is not legal -is not legal
1 can not be first
Liza Fireman
Significat names
cst = wh * pphr + prt;
pt = cst * (1 + v);
total_cost = work_hours * price_per_hour + parts_cost;payment = total_cost * (1 + vat);
Liza Fireman
2021222324252627
Types
2 bytes = 16 bits 32,000
4 bytes = 32 bits 2,000,000,000
short int long≥ ≥
00001101 =20 + 22 + 23 = 1 + 4 + 8 = 13
Liza Fireman
Hello World Program
2 bytes = 16 bits 65,000
4 bytes = 32 bits 4,000,000,000
unsigned short unsigned int unsigned long
Liza Fireman
Types
5000 , -30
256L , 30l
256U , 30u
12300ul 1234567UL
1.5 , -3.0, 4.2e5 , 10e-60
36.7F , 4.2e+5f
36.7L , .5l
Liza Fireman
Characters - ASCII
55‘7’
56‘8’
57‘9’
58’:‘
59’;‘
60‘<‘
61‘=‘
65‘A’
66‘B’
67‘C’
68‘D’
69‘E’
70‘F‘
71‘G‘
97‘a’
98‘b’
99‘c’
100‘d’
101‘e’
102‘f‘
103‘g‘
Liza Fireman
chars
#include <stdio.h>int main(){
char ch = 65;printf(“%d\n”, ch);printf(“%c”, ch);
} 65A
Liza Fireman
chars
#include <stdio.h>
int main()
{
printf(“%c %c %c\n”, ‘b’, ‘b’+1, ‘b’ + 2);
}
b c d
Liza Fireman
chars
#include <stdio.h>
int main()
{
char letter;
printf("Enter a lowercase letter: ");
scanf("%c", &letter);
printf("In uppercase: %c", (letter - 'a') + 'A');
} Enter lowercase letter: f
In uppercase: F
Liza Fireman
getchar
#include <stdio.h>int main(){
char letter;printf("Enter a lowercase letter: ");letter = getchar();printf("In uppercase: %c", (letter - 'a') + 'A');
}
Liza Fireman
Types
char → short → int → long → float → double → long double
7 / 3
7.0 / 3
7 / 3.0
=0
Liza Fireman
Types
int apples = 30, children = 12;double juice_from_apple = 0.1;double tot_orange_juice = 5.4;
double liters_per_cup = 0.3; double orange_juice_per_child = tot_orange_juice /
children;double apple_juice_per_child = (apples / children) *
juice_from_apple;double total_juice_per_child =
orange_juice_per_child + apple_juice_per_child;
double / int int * double
double + double
int / int
Liza Fireman
Types
int apples = 30, children = 12;
double juice_from_apple = 0.1;
double tot_orange_juice = 5.4;
double liters_per_cup = 0.3; …
int minimum_cups_per_child = total_juice_per_child / liters_per_cup;
double / double
int = double
Liza Fireman
casting
#include <stdio.h>int main(){
int cake_num = 5, children = 3;
double cake_per_child =
}
cake_num / children
Liza Fireman
casting
#include <stdio.h>int main(){
int cake_num = 5, children = 3;
double cake_per_child =
}
)double(cake_num / children
Liza Fireman
casting
#include <stdio.h>int main(){
int cake_num = 5, children = 3;
double cake_per_child =
}
cake_num / (double)children
Liza Fireman
casting
#include <stdio.h>int main(){
int cake_num = 5, children = 3;
double cake_per_child =
}
)double)(cake_num / children(
Liza Fireman
operators
a+ba-ba*ba/ba%b
a==ba!=ba<ba>ba<=ba>=b
a=ba+=ba-=ba*=ba/=ba%=b
a&&ba||b
a++++aa----a
Liza Fireman
Operatorsאסוציאטיביותאופרטורים
משמאל לימין. >- [] ()
! ~ ++ -- + - * & (type) sizeofמימין לשמאל
משמאל לימין* / %
משמאל לימין+ -
משמאל לימין>> <<
משמאל לימין> >= < <=
משמאל לימין== !=
משמאל לימין&
משמאל לימין^
משמאל לימין|
משמאל לימין&&
משמאל לימין||
מימין לשמאל?:
מימין לשמאל= += -= */ /= %= &= ^= |= >>= <<=
משמאל לימין,
Liza Fireman
Operatorsint main(){ char c; int t = 5, s = 7 ; double x = 8.5, y = 7.2 ; c = 'a' ; t = c + 1; c = t; printf("c = %c\n", c); t = (t - 'a' + 3) * x; s = s * y; printf("t = %d , s = %d\n", t , s); …}
c=bt = 34 s = 50
‘a’ + 1 = ‘b’ = 98‘b’ - ‘a’ + 3 = 1 + 3 = 4
4 * 8.5 = 34 7 * 7.2 = 50.4
Liza Fireman
Operatorsint main(){ char c; int t = 5, s = 7 ; double x = 8.5, y = 7.2 ; … x = (int)(y * s); y = (int)y * s; printf(“x = %lf , y = %lf\n", x , y); return 0 ;}
x=360.000000, y=350.000000
7.2 * 50 = 3607 * 50 = 350
Liza Fireman
Operators
int x , y;
x = 8 ;
y = ++x;
printf(“x = %d y = %d”,x ,y);
x=9, y=9
x= x + 1; y = x;
Liza Fireman
Operators
int x , y;
x = 8 ;
y = x++;
printf(“x = %d y = %d”, x ,y);
x=9, y=8
y = x; x= x + 1;
Liza Fireman
Operators
int n = 5, x , y;
x = n++;
y = ++n;
printf(x = %d , y = %d , x , y ) ;
x=5, y=7
Liza Fireman
Operators
int x = 5, y ;
y = -x + x ;
y = ++x ;
y = x++ ;
x = ++x + x++ ;
-5 + 5 = 0
x = 7, y = 6
x = 6, y= 6
Liza Fireman
Int and double
10 + 20 – 5 – 2
10 * 20 / 8 / 5
10 + 20 * 5
x = 4; y = 5;
z = y += x *= 5;
=23
=5 =110