GATE CS 2017 Set 2 — Question 55
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Programming & Data Structures → C Programming → Arrays & Strings in C
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Question
Consider the following C Program.The output of the program is ________.
#include<stdio.h>
#include<string.h>
int main() {
char* c = "GATECSIT2017";
char* p = c;
printf("%d", (int)strlen(c+2[p]-6[p]-1));
return 0;
}
Correct answer
2 to 2
Solution
1.The string
c is initialized to "GATECSIT2017". The pointer p also points to the same string literal.2.In C, the array subscripting operator
[] is commutative, meaning i[p] is equivalent to *(p + i), which is the same as p[i].3.
2[p] is equivalent to p[2], which is the character 'T'. Its ASCII value is 84.4.
6[p] is equivalent to p[6], which is the character 'I'. Its ASCII value is 73.5.The expression
c + 2[p] - 6[p] - 1 evaluates as follows:6.
c + 10 is a pointer to the character at index 10 of the string "GATECSIT2017".7.Let's map the indices of the string:
| Index | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Char | G | A | T | E | C | S | I | T | 2 | 0 | 1 | 7 | \0 |
c + 10 points to the substring starting at index 10, which is "17".9.The
strlen() function calculates the length of the string excluding the null terminator. For "17", the length is 2.10.Thus, the program prints 2.
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