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การกำหนดตัวแปร
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การกำหนดตัวแปร

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  • 1. - .............................................................. 20 2553 F F .......................................................................................................................................................................... (variables) FF F F F F F F F 5 (char) (int) (float) 2 F (double) F F F (void) F F F F F F char ,F 1 -128 128 int 2 -32768 32767 float 4 3.4E-38 3.4E+38 double 8 1.7E-308 1.7E+308 1. F F F underscore F 2. F underscore 3. F ( F F compiler F 31 F F ) F 4. F 33 asm auto break case char const continue default do double else enum extern float for goto if int long register return short signed sizeof static struct switch typedef union unsigned void volatile while 5.
  • 2. - .............................................................. 20 2553 F F F F F F F F F F F F = F F F char name, day = 'S' , surname[20] ="Kodedee"; int x=5 ,y,z[100]; float a=5.00 ,b,c; double k=1.234567, m ; F F F F F 1. name char . 2. num1 int . 3. sum float . 4. score double . 5. age int .
  • 3. - .............................................................. 20 2553 (operator) F F F F (mathematical operators) F F + 2+5 F7 - 7-4 F3 * 2*6 F 12 / 8/2 F4 % 9%4 F1 F (relational operators) F F < F F 2<3 F (1) > F 2>3 F (false)(0) <= F F F 2<= 3 F (true) >= F F 2>= 3 F (false) == F 4==4 F (true) != F F 2!= 2 F (false) (logical operators) F F && (AND) (2<3)&&(3>1) F || (OR) (2>3)||(4<1) F (false) ! (NOT) F !(2> 3) F (true)
  • 4. - .............................................................. 20 2553 F 1 F F F =5 F =4 = 0.5 x x F F F F F F example1.c /* program example1.c */ #include <stdio.h> int lengt , high ; float area; main() { lengt = 5; high = 4; area = 0.5 * lengt * high ; printf("tDetermination of triangle arean"); printf("tThe length of triangle = %dn ",lengt); printf("tThe height of triangle = %dn ",high); printf("tThe area of triangle = %.2fn",area); }
  • 5. - .............................................................. 20 2553 F 2 2.00 F FF F F F F F F example2.c /* program example2.c */ #include <stdio.h> #define pi 3.14 float radius,area; main() { radius = 2.00; area = pi * radius * radius; printf("tArea of circlen "); printf("tRadius = %.2f n",radius); printf("tArea = %.2f n",area); }