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C program to find the length of a string

  • Difficulty Level : Basic
  • Last Updated : 08 Oct, 2018

Given a string str. The task is to find the length of the string.

Examples:

Input: str = "Geeks"
Output: Length of Str is : 4

Input: str = "GeeksforGeeks"
Output: Length of Str is : 13

In the below program, to find the length of the string str, first the string is taken as input from the user using scanf in Str, and then the length of Str is calculated using loop and using strlen() method .

Below is the C program to find the length of the string.



Example 1: Using loop to calculate the length of string.




// C program to find the length of string
#include <stdio.h>
#include <string.h>
  
int main()
{
    char Str[1000];
    int i;
  
    printf("Enter the String: ");
    scanf("%s", Str);
  
    for (i = 0; Str[i] != '\0'; ++i);
  
    printf("Length of Str is %d", i);
  
    return 0;
}
Output:
Enter the String: Geeks
Length of Str is 5

Example 2: Using strlen() to find the length of the string.




// C program to find the length of 
// string using strlen function
#include <stdio.h>
#include <string.h>
  
int main()
{
    char Str[1000];
    int i;
  
    printf("Enter the String: ");
    scanf("%s", Str);
  
    printf("Length of Str is %ld", strlen(Str));
  
    return 0;
}
Output:
Enter the String: Geeks
Length of Str is 5

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