Program 41:To print length of a string using string functions

Program 41:

#include<stdio.h>
#include<string.h>
main()
{
 char str[100];
 int len;
 printf("Enter a string to know the length\n");
 gets(str);
 len=strlen(str);
 printf("The length of %s is %d\n",str,len);
}

Explanation:
Here we used string.h header for using string library functions such as strlen,strcpy,gets,strcmp etc.

1. This program starts with initializing :
   • str[100] → To store string with length of 100 which means it can store 100 letters
   • len→ To store length of given string.

2.  printf("Enter a string to know the length\n");
    gets(str);

   To take input from user. Difference between gets(str) ,and taking input using scanf is that,using gets we can enter a string having spaces in between words and takes Enter as end of the string.But scanf wont take 'space' as a character.For example if we enter a string 'hello world' using :-
   • scanf- It will take only  'hello'
   • gets- It will take 'hello world'

3. len=strlen(str);
    printf("The length of %s is %d\n",str,len);

   strlen calculates the length of str and final length value is printed as output.

 Output: