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AATTK SOFTWARE
This is a example code.
  1. #include <stdio.h>
  2.  
  3. // Variable declaration:
  4. extern int a, b;
  5. extern int c;
  6. extern float f;
  7.  
  8. int main () {
  9.  
  10.    /* variable definition: */
  11.    int a, b;
  12.    int c;
  13.    float f;
  14.  
  15.    /* actual initialization */
  16.    a = 10;
  17.    b = 20;
  18.  
  19.    c = a + b;
  20.    printf("value of c : %d \n", c);
  21.  
  22.    f = 70.0/3.0;
  23.    printf("value of f : %f \n", f);
  24.  
  25.    return 0;
  26. }