C Programming: Find the length of a string

C String: Exercise-2 with Solution

Write a program in C to find the length of a string without using library function.

C Programming: Find the length of a string

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>

void main()
    char str[100]; /* Declares a string of size 100 */
    int l= 0;
       printf("\n\nFind the length of a string :\n");
       printf("Input the string : ");
       fgets(str, sizeof str, stdin);
    printf("Length of the string is : %d\n\n", l-1);

Sample Output:

Find the length of a string :                                                                                 
Input the string : w3resource.com                                                                             
Length of the string is : 15 


Flowchart: Find the length of a string.

C Programming Code Editor:

Improve this sample solution and post your code through Disqus.

Previous: Write a program in C to input a string and print it.
Next: Write a program in C to separate the individual characters from a string.

What is the difficulty level of this exercise?

C Programming: Tips of the Day

How to measure time in milliseconds using ANSI C?

There is no ANSI C function that provides better than 1 second time resolution but the POSIX function gettimeofday provides microsecond resolution. The clock function only measures the amount of time that a process has spent executing and is not accurate on many systems.

You can use this function like this:

structtimevaltval_before, tval_after, tval_result;

gettimeofday(&tval_before, NULL);

// Some code you want to time, for example:

gettimeofday(&tval_after, NULL);

timersub(&tval_after, &tval_before, &tval_result);

printf("Time elapsed: %ld.%06ld\n", (long int)tval_result.tv_sec, (long int)tval_result.tv_usec);

This returns Time elapsed: 1.000870 on my machine.

Ref : https://bit.ly/3lpwoMn