foo.c: In function 'main':
foo.c:13:15: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'long long int' [-Wformat=]
     printf("%ld %ld",x,y);
             ~~^
             %lld
foo.c:13:19: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'long long int' [-Wformat=]
     printf("%ld %ld",x,y);
                 ~~^
                 %lld
foo.c:7:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ^~~~~~~~~~~~~~

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