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  1. #include <stdio.h>      
  2. #include <stdlib.h>     
  3. #include <time.h>      
  4.  
  5. // problem: var6 becomes -1 inside func2 during the use of the inner for loop
  6.  
  7. #define N1 7
  8. #define N2 6
  9. #define N3 10
  10.  
  11. void func1()
  12. {
  13. 	// do stuff	
  14. }
  15.  
  16. void func2(int var1[], int var2[], int var3[][N2], int var4[])
  17. {
  18. 	int i, j;
  19.  
  20. 	for (i = 0; i < N3; i++)
  21. 	{
  22. 		for (j = 0; j < N2; j++)  // this line here is where var6 goes from 0 to -1
  23. 		{
  24. 			// stuff
  25. 		}
  26. 	}
  27.  
  28. 	// more code here
  29. }
  30.  
  31. int main()
  32. {
  33. 	srand(time(NULL));
  34.  
  35. 	// i have completely commented out this function call and foo still is changed.
  36. 	// left it in just in case
  37. 	func1();
  38.  
  39. 	int var1[N1];
  40. 	int var2[N1];
  41. 	int var3[N1][N2];
  42. 	int var4[N1];
  43.  
  44. 	// int foo; // if foo is declared then the problem does not occur
  45.  
  46. 	// if var5 and var6 are declared after func2 then var6 does not become -1
  47. 	int var5[1000];
  48. 	int var6 = 0;
  49.  
  50. 	func2(var1, var2, var3, var4);
  51.  
  52. 	// more code
  53. }
Success #stdin #stdout 0s 2152KB
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https://ideone.com/TzTmDK
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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