C Exercises: Get the environment string

Last update on July 29 2025 12:57:17 (UTC/GMT +8 hours)

9. Retrieve Environment String

Write a C program to get the environment string.

Sample Solution:

C Code:

#include<stdio.h>      // Include the standard input/output header file.
#include<stdlib.h>     // Include the standard library header file.

int main ()          // Start of the main function.
{
char * PathPtr;   // Declare a pointer to char 'PathPtr'.

PathPtr = getenv ("PATH");   // Get the value of the environment variable "PATH" and assign it to 'PathPtr'.

if (PathPtr!=NULL)   // Check if 'PathPtr' is not NULL (i.e., if the environment variable was found).
printf ("\nThe set path is: %s\n\n",PathPtr);   // Print the value of the environment variable "PATH".

return 0;   // Return 0 to indicate successful execution of the program.
}   // End of the main function.

Sample Output:

The set path is: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to retrieve and display the PATH environment variable using getenv().
Write a C program to iterate over all environment variables and print those containing a specific keyword.
Write a C program to safely retrieve an environment variable and handle the case when it is not set.
Write a C program to parse the environment string into individual key-value pairs and display them.

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