CODEWITHSUNDEEP
cstringchar
Zeus Legend
Zeus Legend

Reputation: 35

Adding and subtracting strings and characters in C

I saw a question which had code snippet in C like this

#include <stdio.h>

int main() {
    char s[] = "MANIPAL2022";
    printf("%s", s+s[4]-s[3]);

    return 0;
}

which returned:

2022

I am not able to understand what is being done here and how is the adding of characters showing these values.

Moreover a string of the same length like WESTHAM2022 returned nothing

I tried to understand the pattern for this and for char s[] = "WESTHAM2022" printf("%s", s+s[5]-s[3]); The compiler returned some garbage value !)�U

And for

char s[] = "WESTHAM2022";
    printf("%s", s+s[2]-s[3]);

it returned 9WESTHAM2022

Upvotes: 0

Views: 143

Answers (1)

l4m2
l4m2

Reputation: 1157

 s+s[4]-s[3]
="MANIPAL2022"+'P'-'I'
="MANIPAL2022"+80-73
="MANIPAL2022"+7
="2022"

Here the last step is how pointer works.

With s = "WESTHAM2022", s+s[5]-s[3] = s-19, pointing at an undefined area, thus it can return anything or crash

Upvotes: 4

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