Which of the following functions is used to find the length of a string in C?

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RRB JE ECE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. sizeof()
  2. strlen()
  3. length()
  4. strlength()

Answer (Detailed Solution Below)

Option 2 : strlen()
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Detailed Solution

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The correct answer is: 2) strlen()

Explanation:
In C, the strlen() function (from the <string.h> library) is used to determine the length of a null-terminated string (number of characters excluding the terminating '\0').

Option Analysis

  • sizeof() → Returns the size of a variable/type in bytes (not string length).
  • length() → Not a standard C function (common in C++ for std::string).
  • strlength() → Doesn’t exist in standard C.

Example:
C program:
#include <string.h>
#include <stdio.h>

int main() {
    char str[] = "Hello";
    printf("Length: %zu", strlen(str));  / Output: 5
    return 0;
}

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