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include <iostream>
using namespace std; 
 
#define SYS_NUM(num) qwer##num   
 
 
 
void main ()
{
 
 char num[10]="ty";
 num1 = SYS_NUM (ty);
 cout<<num;
}
	return 0;
}
 

prog.c:1:9: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘<’ token
 include <iostream>
         ^
prog.c:8:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main ()
      ^
prog.c: In function ‘main’:
prog.c:12:2: error: ‘num1’ undeclared (first use in this function)
  num1 = SYS_NUM (ty);
  ^
prog.c:12:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:4:22: error: ‘qwerty’ undeclared (first use in this function)
 #define SYS_NUM(num) qwer##num   
                      ^
prog.c:12:9: note: in expansion of macro ‘SYS_NUM’
  num1 = SYS_NUM (ty);
         ^
prog.c:13:2: error: ‘cout’ undeclared (first use in this function)
  cout<<num;
  ^
prog.c: At top level:
prog.c:15:2: error: expected identifier or ‘(’ before ‘return’
  return 0;
  ^
prog.c:16:1: error: expected identifier or ‘(’ before ‘}’ token
 }
 ^

Standard output is empty