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Are the expressions *++ptr and ++*ptr same?

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Are the expressions *++ptr and ++*ptr same?

1 Answer

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Both expressions are different. Let’s see a sample code to understand the difference between both expressions.

#include <stdio.h>
int main(void)
{
int aiData[5] = {100,200,300,400,500};
int *piData = aiData;
++*piData;
printf("aiData[0] = %d, aiData[1] = %d, *piData = %d", aiData[0], aiData[1], *piData);
return 0;
}

Output: 101 , 200 , 101

Explanation:
In the above example, two operators are involved and both have the same precedence with a right to left associativity. So the above expression ++*p is equivalent to ++ (*p). In another word, we can say it is pre-increment of value and output is 101, 200, 101.

#include <stdio.h>
int main(void)
{
int aiData[5] = {100,200,30,40,50};
int *piData = aiData;
*++piData;
printf("aiData[0] = %d, aiData[1] = %d, *piData = %d", aiData[0], aiData[1], *piData);
return 0;
}
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