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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("---------------------------------\n"); 	
       printf("Input the string : ");
       fgets(str, sizeof str, stdin);
    while(str[l]!='\0')
    {
        l++;
    }
    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:

Flowchart: Find the length of a string.

C Programming Code Editor:

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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.

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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:
sleep(1);

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