CodeBhavya

C PROGRAMMING PROGRAM • STRINGS

Find String Length Without strlen()

Learn how to find string length without strlen() using a clear C program.

BeginnerStringsCharacter arraysLoops

PROBLEM UNDERSTANDING

Input and expected output

Sample input
CodeBhavya
Sample output
Length = 10

COMPLETE C PROGRAM

Complete C implementation

string-length-without-strlen.c
Open in compiler
#include <stdio.h>

int main(void)
{
    char text[200];
    int length = 0;

    printf("Enter text: ");
    fgets(text, sizeof text, stdin);
    while (text[length] != '\0' && text[length] != '\n') length++;
    printf("Length = %d\n", length);
    return 0;
}

GUIDED CODE TOUR • NOT LIVE EXECUTION

Study the program line by line

Use the real compiler button above to run and debug with different inputs.

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

Length = 10
0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

  1. Read the required input values.
  2. Count characters until the null terminator or newline is reached.
  3. Display the computed result.

Count characters until the null terminator or newline is reached.

EFFICIENCY

Time and space complexity

Time complexity

O(n)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

Use the correct format specifier for every variable.

Check this

Initialize variables before using their values.

Check this

Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.