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# ภาษาซี

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### ภาษาซี

1. 1. 1. Preprocessing Directive #include <stdio.h> stdio.h preprocessing directives
2. 2.  2- #include < > include)- #include “ ”
3. 3. 2. main( ) main “ ” { } { } main( ) void main(void) main()
4. 4. 3. comment) source code 2•
5. 5. Run >Run < Ctrl + F9> ) LampangKanlayanee Schoolprintf( )String) ;) stdio ( standardinput output) #include directive) stdio.h header file)
6. 6.  : printf() printf() intprintf (<control>, <argument list>);
7. 7. printf()(Statements) argument list 1 (,)control “” 2
8. 8. %c%s% d% u% f% e e%x%o
9. 9.  1.1 printf()intmain( ){ intsum=3;printf(“ The sum is %d ”,sum);return 0;}The sum is 3
10. 10.  1.2 printf() %d %uintmain( ){ intnum = -3, tot = 5;printf(“num = %d tot = %u ”,num,tot);return 0;}num = -3 tot = 5
11. 11. 1.3 printf() %f %e 2intmain( ){ floatnum = 22.75;printf(“ %.2fn%.2e ”,num,num);return 0;}22.752.28e+01
12. 12.  printf ( ) printf( ) print format
13. 13.  %d %u %f %c 1 %s 1
14. 14.  n t tab 8 a Backslash
15. 15.  printf( )
16. 16. 5 + 5 = 10 printf( ) string format
17. 17. Hello word 3 2 data list
18. 18.  printf( ) string format ““ data list ““ printf( )• d 2• d a• s b
19. 19.  f) printf( ) f
20. 20.  6 printf( ) n)printf( ) printf( ) n)printf( )
21. 21.  : scanf()intscanf (<control>, <argument list>); intscanf (<control>, <argument list>); scanf() (key board)
22. 22. argument list (,) & control “” printf
23. 23.  2.1 scanfintmain( ){ intnum;scanf( “ %d ”,&num);return 0;} 1 num
24. 24. 2.2 scanfintmain( ){ intnum; charch;scanf( “ %c ”,&ch);scanf( “ %d ” ,&num);printf(“ %d %c ” ,num, ch);return 0;} 2 1 num 1
25. 25.  : expression var = expression ; var = expression ; var Expression
26. 26.  : expression var = expression ; var = expression ; var Expression
27. 27. sum = a b ; a b sum
28. 28.  – putchar() putchar() intputchar (<character>); putchar() (Statements)
29. 29. 1.4 putchar()intmain( ){ inta=65;putchar(a);putchar(„a‟);return 0;}Aa
30. 30. 2 getchar ( ) getchar ( ) 1 enter getchar ( ); getchar ( );
31. 31. 3 getch ( ) getch ( ) 1 enter getch ( );
32. 32. 4 getche ( ) getche ( ) 1 enter getche ( );
33. 33.  3. – 3.1#include <stdio.h>intmain(){intx_value = 9;printf("x = %dn",x_value);return0;}
34. 34.  3.2#include <stdio.h>intmain(){intx,y,sum;x = 7; y = 2;sum = x + y;printf("Total = %dn",sum);return0;}
35. 35.  3.3#include <stdio.h>intmain(){int x, y;x = 7; y = 4;--x; ++y;printf("x = %2dn",x);printf("y = %6dn",y);return0;}
36. 36.  3.4#include <stdio.h>intmain(){int profits, employees;profits = 9; employees = 2 ;printf("Each employee gets %.2f", (float) profits/employees);return0;}
37. 37.  3.5include<stdio.h>intmain(){charany_char;printf("Please type a character: "); scanf("c%",&any_char);printf("Thank you, your character are %c",any_char);return0;}
38. 38.  3.6#include <stdio.h>int main(){printf("n****Using .1f****n");printf("%.1f%.1f%.1fn", 4.0, 16.5, 589.3);printf("%.1f%.1f%.1f", 400.0, 1600.5, 58900.3);printf("nn****Using 8.1f****n");printf("%8.1f%8.1f%8.1fn", 4.0, 16.5, 589.3);printf("%8.1f%8.1f%8.1f", 400.0, 1600.5, 58900.3);printf("%-8.1f%-8.1f%-8.1fn", 4.0, 16.5, 589.3);printf("%-8.1f%-8.1f%-8.1f", 400.0, 1600.5, 58900.3);return 0;}
39. 39.  3.7#include <stdio.h>int main(){printf("n");printf("xC9xCDxBBn");printf("xC8xCDxBCn");return 0;}
40. 40.  3.8#include <stdio.h>#include <ctype.h>intmain(){charany_char;printf("Please type a lowercase letter:");scanf("%c", &any_char);if(any_char>= a)printf("In uppercase: %c n", toupper(any_char));return0;}
41. 41.  – string char [ n ] put puts string_argument ; string_argument
42. 42. - wordChar word [15] = * Example * ;- putsputs word ;puts ;
43. 43.  gets enter getsgets ; ; string_var = get ;string_var = get ;
44. 44.  - enter gets word ; - -printf you name is %s n ,word ;
45. 45.