C program to reverse the content of the file and print it

C Program to Print the Length of a String Using %n Format Specifier

Last Updated : 15 Jan, 2025

In C, strings are arrays of characters terminated by a null character ('\0') and the length of a string is the number of characters before this null character. In this article, we will learn how to find the length of the string using %n format specifier.

The %n is a special format specifier for printf that stores the number of characters printed so far into an integer variable, allowing you to track the string's length without printing anything. So, if we print only the string using printf, we can find the length of the string using %n format specifier.

C

#include <stdio.h>

int main(){
    int len = 0;

    // Print the string and use %n to store number
  	// of characters printed in 'len'
    printf("Geeks%n", &len);

  	// print length
    printf(" = %d", len);

    return 0;
}

Output

Geeks = 5

Explanation: In this program, the string "Geeks" is printed using printf and %n specifier is inserted at the end. It stores the number of characters printed by printf inside variable x which in this case is 5.

C program to reverse the content of the file and print it

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