GATE Overflow Test Series | Programming | Test 1 | Question: 26

Question

What will be the maximum value printed by the following C program?

#include<stdio.h>
int main()
{
    int i = 0;
    char* p = "THISISRIDICULOUS";
    while(*(p+i) != '\0')
    {
        printf("%d ", *(p+i++) - 'A');
    }
}

Answer 1

The highest value alphabet here is 'U' and the difference of 'U' and 'A' is $20.$

Comments

sir can you pls eloborate..??

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The while loop iterates over all the characters of the string pointed by p till end of string is reached. 

In the print statement, *(p+i++) evaluates to ‘T’ in the 1^st iteration ( due to post increment )

i=0 – *(p+i++) - 'A’  => ‘T’ – ‘A’ = 84 -65 = 19 ( consider ASCII values )

i=1 – *(p+i++) – ‘A’ => ‘H’ – ‘A’ = 72 – 65 = 7 and so on.

Now, max value will be printed for ‘U’ which is 85-65 = 20