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  1. #include <stdio.h>
  2.  
  3. void swap(int & x, int & y) 
  4. { 
  5.     int z = x; 
  6.     x = y; 
  7.     y = z; 
  8. }  
  9. int main() 
  10. {
  11.     int a = 0, b = 1;
  12.     swap(a,b);
  13.     printf("a is now %d\n", a);
  14.     printf("b is now %d\n", b);
  15. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.c:3:15: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void swap(int & x, int & y)
               ^
prog.c: In function ‘main’:
prog.c:12:5: warning: implicit declaration of function ‘swap’ [-Wimplicit-function-declaration]
     swap(a,b);
     ^~~~
stdout
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Standard output is empty
https://ideone.com/7WjuiW
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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