C Exercises: Compute the length of a given string

Last update on March 20 2025 12:34:48 (UTC/GMT +8 hours)

5. String Length Inline Variants

Write a C program to compute the length of a given string using inline function.

Sample Solution:

C Code:

#include <stdio.h>

#include <stdlib.h>

inline int string_length(char * str) {
  int len = 0;
  while ( * str++) {
    len++;
  }
  return len;
}

int main() {
  char str[] = "w3resource.com";
  int len = string_length(str);
  printf("The length of the string '%s' is %d\n", str, len);
  char str1[] = "Learn C Programming";
  len = string_length(str1);
  printf("\nThe length of the string '%s' is %d\n", str1, len);
  return 0;
}

Sample Output:

The length of the string 'w3resource.com' is 14

The length of the string 'Learn C Programming' is 19

Explanation:

In this exercise, the string_length function is defined as an inline function using the inline keyword before the function signature. The function takes a pointer to a character array (string) as its argument, and returns the string length as an integer.

The main function in this example initializes a character array with a string. It calls the string_length function to compute the string length, and prints the result to the console using the printf() function.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to compute the length of a string ignoring whitespace using an inline function.
Write a C program to calculate the length of a string using pointer arithmetic in an inline function.
Write a C program to count only alphabetic characters in a string using an inline function.
Write a C program to determine the length of a string and verify it against a user-specified value using an inline function.

C Programming Code Editor:

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