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#include <stdio.h>
 
main()
{
    int x = 100, y = 500;
 
    __asm{
            mov eax, x
            xchg eax, y
            mov x, eax
         }
    printf("%d %d\n", x, y);
}

prog.c:3:1: warning: return type defaults to ‘int’ [-Wreturn-type]
 main()
 ^
prog.c: In function ‘main’:
prog.c:7:10: error: expected ‘(’ before ‘{’ token
     __asm{
          ^
prog.c:8:13: error: unknown type name ‘mov’
             mov eax, x
             ^
prog.c:9:13: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘xchg’
             xchg eax, y
             ^
prog.c:8:17: warning: unused variable ‘eax’ [-Wunused-variable]
             mov eax, x
                 ^
prog.c:13:1: error: expected declaration or statement at end of input
 }
 ^
prog.c:13:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty