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Editorial Team
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Asked: 2026-05-16T20:44:51+00:00

int val = 5; printf(%d,++val++); //gives compilation error : ‘++’ needs l-value int *p

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int val = 5;

printf("%d",++val++); //gives compilation error : '++' needs l-value

int *p = &val;
printf("%d",++*p++); //no error

Could someone explain these 2 cases? Thanks.

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1 Answer

  1. Editorial Team

    ++val++ is the same as ++(val++). Since the result of val++ is not an lvalue, this is illegal. And as Stephen Canon pointed out, if the result of val++ were an lvalue, ++(val++) would be undefined behavior as there is no sequence point between the ++s.

    ++*p++ is the same as ++(*(p++)). Since the result of *(p++) is an lvalue, this is legal.

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