C Program to Find the Length of a String without using the Built-in Function

This is a C program to find the length of a string without using the built-in function.

Problem Description

This program takes a string as input and finds its length without using the built-in function.

Problem Solution

1. Take a string as input and store it in the array.
2. Using for loop count the number of characters in the array and store the result in a variable.
3. Print the variable as output.

Program/Source Code

Here is source code of the C program to find the length of a string without using the built-in function.The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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/*
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 * C program to find the length of a string without using the

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 * built-in function
```
```
 */
```
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#include <stdio.h>
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```
 
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```
void main()
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{
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    char string[50];
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    int i, length = 0;
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    printf("Enter a string \n");
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    gets(string);
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    /*  keep going through each character of the string till its end */

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    for (i = 0; string[i] != '\0'; i++)
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    {
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        length++;
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    }
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    printf("The length of a string is the number of characters in it \n");

    printf("So, the length of %s = %d\n", string, length);

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}
```

Program Explanation

1. Take a string as input and store it in the array string[].
2. Using for loop count the number of characters in the array string[]. Use the variable length to keep the count of the characters in the array.
3. Do step-2 till the end of input string.
4. Print the variable length as output.

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Runtime Test Cases

Enter a string
Sanfoundry
The length of a string is the number of characters in it
So, the length of Sanfoundry = 10

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If you wish to look at other example programs on Strings, go to C Programming Examples on Strings. If you wish to look at programming examples on all topics, go to C Programming Examples.

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